HP ZBook Studio G7 Laptop Battery: Balanced Battery Life for Mobile Workstations with an 83Wh Capacity

As a portable mobile workstation, the HP ZBook Studio G7 features an 83Wh six-cell lithium polymer HP ZBook Studio G7 Laptop Battery (some higher-end models use a 94Wh eight-cell lithium-ion battery), which is relatively high among similar products.
HP ZBook Studio G7 Laptop Battery Charging Performance: 50% Charge in 30 Minutes
The G7 supports HP Fast Charge technology, officially rated to 50% in 30 minutes. In actual testing, it took approximately 30 to 45 minutes to reach half charge. HP ZBook Studio G7 Laptop BatteryCharging to 80% takes about an hour, and a full charge takes about 3 hours (with the laptop powered off). For users who need to leave temporarily, this speed is sufficient for a quick emergency power boost.
HP ZBook Studio G7 Laptop Battery Life Test: Brightness is the Biggest Variable
Battery life varies significantly depending on screen brightness and workload. In a Wi-Fi browsing test at 150 nits brightness, theHP ZBook Studio G7 Laptop Batterylife approached 8 hours; however, when the 4K DreamColor screen (maximum brightness 700 nits) was turned up to maximum brightness, the HP ZBook Studio G7 laptop’s battery life plummeted to around 4.5 hours. Light daily office work (emails, document processing) can last for over 3 hours, but battery life will further decrease when running professional software such as SOLIDWORKS. The high-brightness screen is the biggest drain on theHP ZBook Studio G7 Laptop Battery life of this HP ZBook Studio G7 laptop.

HP ZBook Studio G7 Laptop Battery: Battery Life and Replacement

This battery is designed for 800 to 1000 cycle lifespans. Replacement should be considered when the capacity drops to 80%. HP has incorporated Battery Health Manager for intelligent charging management, which monitors high state of charge to slow down aging. If the HP ZBook Studio G7 Laptop Battery lasts less than one hour or swells, it should be replaced promptly.

MB06XL 83Wh 6880mAh Battery Replacement for HP ZBook Studio G7 2J3H8PA

Hp MB06XL battery replacement for HP ZBook Studio G7 2J3H8PA with a capacity of 83Wh 6880mAh battery is a brand new and it is compatible with 100% original and replacement battery. Wholesale and retail of Hp MB06XL battery is of high quality and low price!Each Hp MB06XL battery undergoes thorough quality checks before dispatch for you location. This ensures that you get a reliable, tested High quality product that meets the highest standards.


“All kinds of Hp Laptop batteries and chargers at batteryforpc.co.uk. Hp Laptop Battery with wholesale or retail is high quality & low price. Get 30% off buyHp Laptop battery.

ASUS ROG Flow X13 Laptop Battery Life and Replacement

ASUS ROG Flow X13 Laptop BatterySpecifications and Expected Lifespan
In actual mixed office scenarios, the ASUS ROG Flow X13 laptop battery life typically ranges from 4 to 8 hours. However, when playing games, the battery life drops drastically to around 2 hours.
The lithium-ion battery in the ASUS ROG Flow X13 laptop naturally degrades with charge-discharge cycles. According to repair data, the battery capacity typically drops to about 80% of its initial capacity after 800 to 1000 complete cycles. This means that under intensive use with daily charging, the ASUS ROG Flow X13 laptop battery may need to be replaced after 2 to 3 years.
When and How to Replace Your ASUS ROG Flow X13 Laptop Battery:
The following signs indicate that your ASUS ROG Flow X13 laptop battery is severely aged: significantly reduced battery life (e.g., less than 1 hour), abnormal battery level fluctuations (e.g., shutdown at 30%), or, most dangerously, battery swelling causing the laptop’s bottom cover to be pushed up. Battery swelling must be addressed immediately, otherwise it may compress internal components and cause permanent damage.
Replacing yourASUS ROG Flow X13 Laptop Battery is generally a low-skill operation. The core safety procedure is: always disconnect the power adapter and the battery connector first, waiting more than 10 seconds to avoid damaging the motherboard ICs. Use a non-conductive pry tool for disassembly, and be sure to disconnect the red cable side first. After replacement, it is recommended to perform a full charging cycle to calibrate the battery level.
If your ASUS ROG Flow X13 laptop battery is already showing signs of battery life anxiety or ASUS ROG Flow X13 Laptop Battery swelling, replacing it promptly is a crucial step in restoring its mobility.

C41N2009 62WH Battery Replacement for Asus ROG Flow X13 GV301QC GV301QE GV301QH
Asus C41N2009 battery replacement for Asus ROG Flow X13 GV301QC GV301QE GV301QH with a capacity of 62WH battery is a brand new and it is compatible with 100% original and replacement battery. Wholesale and retail of Asus C41N2009 battery is of high quality and low price!Each Asus C41N2009 battery undergoes thorough quality checks before dispatch for you location. This ensures that you get a reliable, tested High quality product that meets the highest standards.

All kinds of Asus Laptop batteries and chargers at batteryforpc.co.uk. Asus Laptop Battery with wholesale or retail is high quality & low price. Get 30% off buy Asus Laptop battery.”

Recommendations for Maintaining the Lenovo Yoga Slim 7i Laptop Battery

Enable the Lenovo Yoga Slim 7i laptop battery maintenance mode. Limit the charging limit when using the laptop for extended periods while plugged in.
Keep the Lenovo Yoga Slim 7i laptop battery between 20% and 80% charge, avoiding prolonged periods at full charge or complete depletion.
Do not place the laptop on blankets, sofas, or other surfaces that hinder heat dissipation. High temperatures are more damaging to the Lenovo Yoga Slim 7i laptop battery than fast charging.
Reduce screen brightness, appropriately lower the refresh rate, and close unused background programs, Bluetooth, and location services.
When not using the laptop for extended periods, keep the Lenovo Yoga Slim 7i laptop battery at around 50% charge, and top it up every few months.
Regularly update the BIOS, graphics card, and power management drivers.
Summary: If your Lenovo Yoga Slim 7i laptop battery is not durable, first check its health. If it’s above 80%, you can improve it through power-saving settings and maintenance mode; if it’s below 80% and battery life is severely insufficient, it is recommended to contact Lenovo official after-sales service for inspection and replacement. By developing the habit of “less full charge, avoiding high temperatures, and controlling background processes” for your Lenovo Yoga Slim 7i laptop battery, you will significantly extend its Lenovo Yoga Slim 7i laptop battery life.

SB10Z33893 6282mAh Battery Replacement for Lenovo Yoga Slim 7i Carbon 13ITL5
“All kinds of Lenovo Laptop batteries and chargers at batteryforpc.co.uk. Lenovo Laptop Battery with wholesale or retail is high quality & low price. Get 30% off buyLenovo Laptop battery.

Tips for Extending Battery Life on Dell Latitude 7390 Laptops

The Dell Latitude 7390 is a classic Dell business laptop. The Dell Latitude 7390 laptop battery is mainly available in two lithium-ion versions: a 3-cell 42Wh battery and a 4-cell 60Wh battery. Some models support ExpressCharge fast charging. The official battery life is approximately 8-12 hours, while actual office use lasts approximately 5-8 hours, affected by screen brightness, background programs, and the battery health.
Key settings for extending the Dell Latitude 7390 laptop battery life of your Dell Latitude 7390 laptop:
Dell Power Manager: Select the “Primary AC Use” mode and limit the charging limit to 80%; or customize a start time of 60% and a stop time of 80%.
BIOS Settings: Press F2 during startup to enter Power Management → Primary Battery Charge Configuration, and select “Primarily AC Use” or customize the threshold.
Daily Habits: Charge your Dell Latitude 7390 laptop battery when it drops to 20%-30%, avoiding complete depletion to 0%; do not leave it plugged in at full charge for extended periods; keep it away from high-temperature environments.
Regular Calibration: If the Dell Latitude 7390 laptop battery level indicator fluctuates, fully charge it, then completely discharge it until it automatically shuts down, and then fully charge it again for calibration.
Replacement Recommendations: The Dell Latitude 7390 laptop batteryis an internal design; simply remove the bottom cover to replace it. The process is straightforward. You can choose a reliable third-party compatible battery, ensuring capacity and interface compatibility.
Summary: Limiting charging to 80% when plugged in, avoiding deep discharge during use, and keeping it away from high temperatures are the most effective ways to extend the Dell Latitude 7390 laptop battery life of your Dell Latitude 7390 laptop.

0G74G 42Wh Battery Replacement for Dell Latitude 7390

Dell 0G74G battery replacement for Dell Latitude 7390 with a capacity of 42Wh battery is a brand new and it is compatible with 100% original and replacement battery. Wholesale and retail of Dell 0G74G battery is of high quality and low price!Each Dell 0G74G battery undergoes thorough quality checks before dispatch for you location. This ensures that you get a reliable, tested High quality product that meets the highest standards.

“All kinds of Dell Laptop batteries and chargers at batteryforpc.co.uk. Dell Laptop Battery with wholesale or retail is high quality & low price. Get 30% off buyDell Laptop battery.

After replacing the battery in my Honor MagicBook 16 Pro laptop, the battery life increased by 2 hours!

My Honor MagicBook 16 Pro has been used for over three years, and recently the Honor MagicBook 16 Pro Laptop Battery has completely given up: it shows 50% battery remaining, but as soon as I unplug it, it drops to 20%, and opening a few web pages causes the screen to go black. I have to carry a charger everywhere I go, and the first thing I do in a coffee shop is look for an outlet. The most frustrating time was when the battery was at 60% before a meeting, but after half an hour it was down to 10%, and I had to squat in a corner to charge it the entire time.
I couldn’t take it anymore and decided to replace the Honor MagicBook 16 Pro Laptop Battery in my Honor MagicBook 16 Pro. The model number of this Honor MagicBook 16 Pro battery is HB6181V1ECW-41, with a capacity of 56Wh and a voltage of 15.28V. I bought a third-party compatible battery, which cost less than half the price of the official one, and it even came with tools and a tutorial.
Replacing the battery is simpler than you might imagine: Power off the laptop, unscrew the back cover screws, gently pry open the back cover, disconnect the old Honor MagicBook 16 Pro Laptop Battery cable, remove the old battery, install the new battery, reconnect the cable, and screw the screws back on. The whole process takes about 15 minutes, requires no soldering, and even those with clumsy hands can manage it.
On the first power-on, the Honor MagicBook 16 Pro laptop battery level display was normal. After a full charge, I specifically tested it for a day: I left home at 9 am with a full charge, and used it for writing documents, holding video conferences, browsing the web, and listening to music. By 4 pm, it still had 35% remaining. Previously, with the same intensity, I would have had to find a charger by noon. Roughly calculated, replacing the Honor MagicBook 16 Pro laptop Honor MagicBook 16 Pro Laptop Batteryy gives you at least 2 hours of free time—no more fighting for power outlets, no more carrying a bulky charger, you can sit anywhere in a coffee shop, or spend a peaceful afternoon in the library.
If you also experience fluctuating battery levels or a sudden drop in battery life on your Honor MagicBook 16 Pro laptop, don’t rush to replace your computer. A single HB6181V1ECW-41 battery can bring my old laptop back to full power. Saving thousands of dollars on a new machine and gaining two extra hours of freedom makes it a worthwhile investment.
A small tip: Try to keep your Honor MagicBook 16 Pro’s battery between 20% and 80% whenever possible; avoid leaving it fully charged for extended periods. If your Honor MagicBook 16 Pro’s battery is bulging, it’s recommended to seek professional repair. After replacing the Honor MagicBook 16 Pro Laptop Battery, my MagicBook 16 Pro can last another two years.

HB6181V1ECW-41 3665mAh Battery Replacement for Huawei HONOR MagicBook 16 Pro HYM-W56
Huawei HB6181V1ECW-41 battery replacement for Huawei HONOR MagicBook 16 Pro HYM-W56 with a capacity of 3665mAh battery is a brand new and it is compatible with 100% original and replacement battery. Wholesale and retail of Huawei HB6181V1ECW-41 battery is of high quality and low price!Each Huawei HB6181V1ECW-41 battery undergoes thorough quality checks before dispatch for you location. This ensures that you get a reliable, tested High quality product that meets the highest standards.

“All kinds of Huawei Laptop batteries and chargers at batteryforpc.co.uk. Huawei Laptop Battery with wholesale or retail is high quality & low price. Get 30% off buy Huawei Laptop battery.”

Recommendations for Optimizing and Maintaining the Asus ZenBook S13 Laptop Battery

Keep screen brightness between 50% and 70%, and enable automatic brightness.
Set the Asus ZenBook S13 laptop battery power mode to “Better Battery Life” or “Power Saving”.
Close unnecessary background applications and startup items.
Turn off Bluetooth and keyboard backlight when not in use.
Enable ASUS Battery Health Charging; set a 60% cap for continuous plugging.
Use anAsus ZenBook S13 laptop battery 65W or PD 45W+ charger.
Regularly update BIOS, graphics card, and power drivers.
Avoid overheating; do not play demanding games while charging.
Keep the Asus ZenBook S13 laptop battery level between 20% and 80%. If battery health drops below 80%, consider official replacement.
The ZenBook S13’s 4210mAh/50Wh Asus ZenBook S13 laptop battery charges at a moderate to high speed, reaching half capacity in 30 minutes and taking approximately 1.5-1.7 hours for a full charge. Regarding Asus ZenBook S13 laptop batterylife, the Asus ZenBook S13 laptop (FHD version) lasts a full day with light office work.

C31N1821 4210mAh/50WH Battery Replacement for Asus ZenBook S13 UX392FA UX392FN UX392FN-XS71
Asus C31N1821 battery replacement for Asus ZenBook S13 UX392FA UX392FN UX392FN-XS71 with a capacity of 4210mAh/50WH battery is a brand new and it is compatible with 100% original and replacement battery. Wholesale and retail of Asus C31N1821 battery is of high quality and low price!Each Asus C31N1821 battery undergoes thorough quality checks before dispatch for you location. This ensures that you get a reliable, tested High quality product that meets the highest standards.
“All kinds of Asus Laptop batteries and chargers at batteryforpc.co.uk. Asus Laptop Battery with wholesale or retail is high quality & low price. Get 30% off buyAsus Laptop battery

HP Spectre x360 14-EA Battery: Setting a new benchmark for battery life in flagship 2-in-1 laptops

In the high-end 2-in-1 laptop market, the HP Spectre x360 14-EA series has won the favor of many professionals with its exquisite design and powerful performance. Supporting this exceptional experience is its built-in 66Wh high-capacity HP Spectre x360 14-EA laptop battery. This powerful “heart” provides solid battery life for users’ mobile office and creative work.
The HP Spectre x360 14-EA laptop battery offers up to 11 to 15 hours and 45 minutes of battery life; in more power-efficient “video playback” scenarios, battery life can be extended to 16.5 hours.
In addition to its high-capacity battery, the Spectre x360 14-EA also comes with a 65W USB Type-C power adapter and supports fast charging. The HP Spectre x360 14-EA laptop battery can recover approximately 50% of its charge in just 45 minutes. This means that even a quick charge before rushing out the door, while having a coffee, can provide several hours of additional power, completely eliminating battery anxiety.
Intelligent Care Extends the Battery Life of the HP Spectre x360 14-EA Laptop
To ensure long-term battery health, HP has also prepared a thoughtful power management solution for the Spectre series. Users can activate “Battery Care Mode” through the pre-installed HP Command Center or My HP software. This feature locks the charging limit at 80%, effectively slowing down battery aging and significantly extending the lifespan of theHP Spectre x360 14-EA laptop battery.
Summary
Overall, the 66Wh battery in the HP Spectre x360 14-EA achieves flagship-level performance in terms of capacity, battery life, and charging speed. Not only does it pack long-lasting power into a slim and lightweight chassis, but it also provides users with a worry-free mobile experience through fast charging and intelligent management technologies. For high-end users who seek both high performance and long battery life, theHP Spectre x360 14-EA laptop battery is undoubtedly a near-perfect choice.
WS04XL 8210mAh Battery Replacement for HP Spectre X360 14-EA 14T-EA HSTNN-DB9Z L97352-2C1

Hp WS04XL battery replacement for HP Spectre X360 14-EA 14T-EA HSTNN-DB9Z L97352-2C1 with a capacity of 8210mAh battery is a brand new and it is compatible with 100% original and replacement battery. Wholesale and retail of Hp WS04XL battery is of high quality and low price!Each Hp WS04XL battery undergoes thorough quality checks before dispatch for you location. This ensures that you get a reliable, tested High quality product that meets the highest standards.

“All kinds of Hp Laptop batteries and chargers at batteryforpc.co.uk. Hp Laptop Battery with wholesale or retail is high quality & low price. Get 30% off buy Hp Laptop battery

Practical Tips for Extending Battery Life of LG Gram 17 17Z90S-G Laptops

LG Gram 17/17Z90S-G: This model typically comes with a 77Wh lithium-ion LG Gram 17 17Z90S-G Laptop Battery. Some higher-end versions may have an 80Wh battery. LG Gram 17/17Z90S-G Laptop Battery Life: Under normal use, the batteries in both models have approximately 500-800 charge-discharge cycles, with an expected lifespan of 3-5 years.
Practical Tips for Extending LG Gram 17/17Z90S-G Laptop Battery Life
1. Enable the “Battery Life Extension” function using the official software (Most crucial)
This is the most effective and recommended method. LG pre-installs power management software on these models, which can limit the charging capacity to 80%, significantly slowing downLG Gram 17 17Z90S-G Laptop Battery aging in the LG Gram 17/17Z90S-G laptop.
How to do it: Search for and open the LG Smart Assistant or My Gram app in the taskbar.
Setup Path: In the software, find Power Settings or PC Management -> Power and Performance, then enable the LG Gram 17 17Z90S-G laptop battery life extension (or similar name) function.
Tip: If you can’t find this function, try looking for it in the LG Control Center.
After enabling, even if the laptop is plugged in, the battery will only charge to about 80%. If you need to use your LG Gram 17 17Z90S-G laptop with a 100% LG Gram 17 17Z90S-G Laptop Battery, you can temporarily disable this function.2. Develop Good Charging and Discharging Habits for Your LG Gram 17 17Z90S-G Laptop Battery
Avoid Overcharging and Over-Discharging: Lithium batteries are most susceptible to damage from prolonged periods of full or low charge. For daily use, it is recommended to maintain the battery level between 20% and 80%. Avoid completely draining the battery before recharging.
3. Maintain a 50% Battery Level for Your LG Gram 17/17Z90S-G Laptop: If you plan to not use your laptop for more than a month, charge the battery to approximately 50% before storing it. Storing it fully charged or completely empty for extended periods will damage theLG Gram 17 17Z90S-G Laptop Battery
4. Pay Attention to the Usage Environment and Details:
Control Temperature: Avoid using or charging in high-temperature environments, such as inside a car in direct sunlight or in poorly ventilated areas. High temperatures are the number one killer of LG Gram 17/17Z90S-G laptop battery life.
Regularly “Activate” the Battery: Even if you primarily use it plugged in, it is recommended to unplug the power cord and run it on battery power for a period of time several times a week. This helps maintain the activity of the internal chemicals in the LG Gram 17 17Z90S-G Laptop Battery
Summary: In general, the key to maintaining the LG Gram 17/17Z90S-G laptop battery is to enable the “Battery Life Extension” function in LG Smart Assistant or My Gram, combined with good habits such as avoiding extreme battery levels and high temperatures. This will ensure yourLG Gram 17 17Z90S-G Laptop Battery remains powerful for many years to come.

LB2122LM 3866mAh Battery Replacement for LG Gram 17 17Z90S-G 15Z90RT
Lg LB2122LM battery replacement for LG Gram 17 17Z90S-G 15Z90RT with a capacity of 3866mAh battery is a brand new and it is compatible with 100% original and replacement battery. Wholesale and retail of Lg LB2122LM battery is of high quality and low price!Each Lg LB2122LM battery undergoes thorough quality checks before dispatch for you location. This ensures that you get a reliable, tested High quality product that meets the highest standards.

“All kinds of Lg Laptop batteries and chargers at batteryforpc.co.uk. Lg Laptop Battery with wholesale or retail is high quality & low price. Get 30% off buy Lg Laptop battery.

Extend the Battery Life of Your Medion Erazer Beast X40 2024 Laptop

The Medion Erazer Beast X40 2024 features a high-performance 4-cell lithium-polymer (Li-Polymer) Medion Erazer Beast X40 2024 Laptop battery with specifications of 15.48V / 6300mAh (99.8Wh). Understanding these basics is the first step in proper battery maintenance.
Practical Tips for Extending the Battery Life of Your Medion Erazer Beast X40 2024 Laptop
1. Optimize Charging HabitsKeep the battery level between 20% and 80%: This is one of the most effective ways to extend the life of a lithium battery. Maintaining a 100% full charge for extended periods or over-discharging (below 10%) will accelerateMedion Erazer Beast X40 2024 Laptop battery aging in your Medion Erazer Beast X40 2024 laptop. If you primarily use your laptop plugged in, it is recommended to set the charging threshold to around 80% via the system or BIOS.
2. Pay attention to temperature control
Ensure good heat dissipation: Gaming laptops generate a lot of heat under high loads, and heat is the number one killer of the Medion Erazer Beast X40 2024 laptop’s battery. Use it on a well-ventilated, hard, flat surface and avoid blocking the vents.
3. Reasonable use and settings
Optimize power settings: In Windows’ “Power & Battery” settings, enable “Power Saving Mode” or select “Best Energy Efficiency” mode. Also, lowering screen brightness and turning off unused peripherals such as Bluetooth can reduce the burden on the Medion Erazer Beast X40 2024 Laptop battery.
Reduce high-load scenarios: Running demanding 3D games or performing video rendering for extended periods will put the CPU and GPU at full load, rapidly consuming power and generating a lot of heat, thus shortening the battery life per charge and the overall lifespan of the Medion Erazer Beast X40 2024 laptop’s battery.
4. Long-Term Storage Precautions
If you need to leave your laptop unused for an extended period (e.g., more than a month), please charge your Medion Erazer Beast X40 2024 laptop battery to approximately 50% before storing it. Storing it fully charged or completely discharged for extended periods will cause irreversible damage to the battery.
By practicing these methods, you can effectively slow down the aging of your Medion Erazer Beast X40 2024 Laptop battery, keeping your Beast X40 running smoothly for a longer time.
PHID1-00-18-4S1P-1 6300mAh Battery Replacement for Medion Erazer Beast X40 2024
Medion PHID1-00-18-4S1P-1 battery replacement for Medion Erazer Beast X40 2024 with a capacity of 6300mAh battery is a brand new and it is compatible with 100% original and replacement battery. Wholesale and retail of Medion PHID1-00-18-4S1P-1 battery is of high quality and low price!Each Medion PHID1-00-18-4S1P-1 battery undergoes thorough quality checks before dispatch for you location. This ensures that you get a reliable, tested High quality product that meets the highest standards.

“All kinds of Medion Laptop batteries and chargers at batteryforpc.co.uk. Medion Laptop Battery with wholesale or retail is high quality & low price. Get 30% off buy Medion Laptop battery.”

Lenovo ThinkPad P14s 5th Generation Laptop Battery + 60-minute fast charge to 80% – Still anxious about battery life?

The Lenovo ThinkPad P14s Gen 5 laptop battery features a CRU replaceable design, allowing users to replace it themselves without needing to send it for repair. Worry-free, cost-effective, and more durable. Keep your inspiration flowing from morning till night.
The Lenovo ThinkPad P14s Gen 5 laptop battery life is the primary productivity driver for mobile workstations.
For a true mobile workstation, performance determines how much you can do, while battery life determines how long you can do it. The ThinkPad P14s Gen 5 is the answer born for “endurance.”
The ThinkPad P14s Gen 5 comes standard with Rapid Charge technology – the Lenovo ThinkPad P14s Gen 5 laptop batterycan be charged to 80% in just 60 minutes. A short break during a meeting or lunch break is all it takes to get back to full power. With a USB-C ultra-thin adapter supporting up to 135W, charging efficiency is further enhanced.
More importantly, the Lenovo ThinkPad P14s Gen 5 laptop battery features a customer-replaceable unit (CRU) design. Users can replace the battery themselves without professional skills; simply scan the QR code on the built-in battery to watch a replacement instruction video. This not only reduces long-term usage costs but also extends the device’s lifespan—a good machine deserves to last longer.
Lenovo ThinkPad P14s Gen 5 laptop battery maintenance recommendations: To extend battery life, it is recommended to maintain daily Lenovo ThinkPad P14s Gen 5 laptop battery level between 15% and 85%, avoiding prolonged periods of full charge or deep discharge.

L23M3P76 3392mAh Battery Replacement for Lenovo ThinkPad P14s Gen 5
“All kinds of Lenovo Laptop batteries and chargers at batteryforpc.co.uk. Lenovo Laptop Battery with wholesale or retail is high quality & low price. Get 30% off buy Lenovo Laptop battery.