In Stock!
Your order will be dispatched within 48 hours. 
+Our batteries are 100% WITH CE-/FCC-/RoHS-Certified for safety
+We only uses high quality materials and grade A battery cells to ensure true capacity and more recharge cycles.
+Thorough, comprehensive testing – each battery cell is tested for correct capacity and to ensure all safety requirements are met - all before installation.
- Specifications
- Brand: Fitbit
- Technology : Li-ion
- Voltage : 3.87V
- Capacity : 65mAh
- Compatible Part Numbers: FB421
- Compatible Model Numbers: Fitbit Charge 5 FB421 Activity Tracker
Product Features
The replacement battery for Fitbit FB421 from Batteryforpc.co.uk will be your best choice. We offer a high-quality battery at a more reasonable price. Our Fitbit FB421 batteries can be charged/discharged for at least 600 cycles. Being made of ABS plastic case and the original IC protection chip, it could give you the new experience of excellent durability.
With first-class quality assurance, the battery for Fitbit FB421 provides protections of voltage, short circuit, charging time, ESD, and so on. Each Fitbit FB421 battery has passed a series of safety certifications, such as CE, UL, ROHS, ISO9001/9002. It will be rigorously tested by our technicians before being shipped to your hands. We will try our best to select a high-quality Fitbit FB421 battery for you.
In addition, we provide 30-Day Money Back Guarantee and a One-Year Warranty for you. If you have any dissatisfaction after receiving the battery for Fitbit FB421, you can click the link to find more details about our Returns and Warranty service. Please rest assured to purchase from us!
30-Days Money Back Guarantee
We promise that if you are not satisfied with the battery for Fitbit FB421 which
you ordered, you can return the battery and we will refund the amount you spent on the purchase
within 30 days.
One-Year Warranty
We are absolutely confident of our sound batteries and offer one year warranty on the
Fitbit FB421 battery replacement.
100% Security Payment
For the security of your account, our payment methods are safe and trustworthy. We protect every
client's privacy, so please buy with confidence!
- + Fitbit Versa 2
- + Fitbit Versa 3 Sense FB511 FB512
- + Fitbit Charge 3 FB409 FB410 FB409GM...
- + Fitbit Charge 4 FB417 Smart Watch
- + Fitbit Charge 5 FB421 Activity Trac...
- + Fitbit Charge 2 Fitness Watch FB407
- + Fitbit Blaze FB502 Smart Fitness Wa...
- + Fitbit Ionic Smartwatch
- + Fitbit Ionic Smartwatch
- + Fitbit Versa FB504 FB505
* Fitbit model Other Batteries
Fitbit Other Battery (Our Popular Products )
SP281928SF
Fitbit Versa 2
165mAh£ 21.00 £ 26.00
FB511
Fitbit Versa 3 Sense FB511 FB512
260mAh£ 21.99 £ 27.00
LSS271621
Fitbit Charge 3 FB409 FB410 FB409GMB
71mAh£ 21.00 £ 26.00
LSS271620SF
Fitbit Charge 4 FB417 Smart Watch
71mAh£ 21.00 £ 26.00FB421
Fitbit Charge 5 FB421 Activity Track
65mAh£ 21.00 £ 26.00
LSSP411415
Fitbit Charge 2 Fitness Watch FB407
63mAh£ 18.99 £ 23.00
LSSP321830AE
Fitbit Blaze FB502 Smart Fitness Wat
167mAh£ 19.77 £ 24.00
LSSP302228SE
Fitbit Ionic Smartwatch
1100mAh£ 21.08 £ 26.001. Better Quality:
With the international Standard Control from R&D, Manufacturing and test, Our battery for Fitbit FB421 have passed CE, UL, ROHS, ISO9001,QS9000 and TS16949.
2. Competitive Price:
At least Save up to 30% from our site battery shopping. We can provide cheap and high quality Fitbit FB421 batteries to benefit our customers.
3. Timely Shipping:
We provide timely delivery to our customers. We will shipping the battery immediately after got your payment. It is usually take 7-15 business days for you get the replacement Fitbit FB421 battery.
4. Technical Support&Service:
We are committed to providing technical support and after sale services as follow:
(1)30 Days Money back of without receiving battery.
(2)1 year free quality warranty after you purchase.
(3)Fast shipping and tax to worldwide.
FAQs
Q:Do I need to create an account to buy a battery for Fitbit FB421?
A:No. You don't need an account to place an order on Batteryforpc.co.uk. There are only three simple steps: add a shopping cart, add a shipping address, and make a payment.
Q: How can I check if the laptop battery is compatible with my laptop?
1) Find the "Model Name" label on the front of your laptop under the keyboard (some are on the back) or the "Battery Model" label on the battery, then look for that model number in the Product Compatibility List on this website.
2) Compare whether the voltage and capacity of your original battery are consistent with ours, and then look at the big picture of our product to see if the interface and general shape are the same.
3) If you have any questions, feel free to 「Contact Us」.
Q: The voltage of the battery on your website is different from my Fitbit FB421 battery. Can it be used?
A:Generally speaking, the voltage of your original Fitbit FB421 battery is the same as ours. However, there may exist inconsistencies. Please do not worry! The voltages in the following situations are compatible with each other.
3.6V / 3.7V
7.2V / 7.4V
10.8V / 11.1V
14.4V / 14.8V
Q: How to charge the Fitbit FB421 battery properly?
A: You should charge the replacement battery for Fitbit FB421 before the battery exhaustively discharged, otherwise it will shorten its life. It is feasible to charge the laptop battery before the power is less than 20%. Meanwhile, the battery should be charged in a dry place, and please pay attention to high temperature, which is the biggest threat to battery life.
Q: How to deal with the replacement battery for Fitbit FB421 when you won't use for a long time?
A: If you let your Fitbit FB421 battery lay idle for a long time, please charge the laptop battery or discharge to about 40%, and then put it in a dry and cool place to save. Indoor temperature is best maintained at 15 to 25 degrees Celsius because the temperature is easy to accelerate the battery aging either too high or too low. You'd better fully charge and discharge the battery at least once a month. Finally please save it in accordance with the above method.
Description of Fitbit FB421 battery
All of our Fitbit FB421 batteries are made with high-quality original new Cells, they are designed to meet or exceed the OEM (original) specifications. FB421 Batteries of Fitbit for Fitbit Charge 5 FB421 Activity Tracker are brand new, 1 year Warranty, 30 days money back guarantee.
We promise that the Fitbit FB421 Battery sold in our website are 100% brand new - We never sell used or refurbished FB421 Battery
100% new high quality Replacement battery Compatible your advent laptops.
Provides excellent discharge characteristics.
Quick delivery for every order.
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