FITBIT FB521 | 3.87V 162mAh/0.627WH Smart Watch Batteries

  2. All Categories
  3. Smart Watch Batteries
  4. FITBIT
  5. FB521

Fitbit 3.87V 162mAh/0.627WH FB521 Replacement Battery For Fitbit Sense 2 / Versa4 Smartwatch Free Shipping

SGD $30.63
Quantity:

Note:Packages usually ship within 24/48 hours of receiving your payment!

Availability In Stock
Model FB521
Capacity 162mAh/0.627WH
Voltage 3.87V
Type Li-ion
Color White
Size *mm(L x W x H)
Service Warranty: 12 months/30 days return
Shipping Shipping to Singapore and other countries
FB521 Batteries are also suitable for:
ZTE Caltta PH600 PH690 PH660
FB521 FB521

Click on the image to enlarge

Shopbatterypc.com This is an online marketplace specializing in the sale of replaceable batteries. We promise that all products sold on our site are brand new. If you are not satisfied with the product you have purchased, we offer a 30-day unconditional money-back guarantee.

Battery compatible with Fitbit Sense 2 / Versa4 Smartwatch battery (not an original FITBIT battery).

Battery for FITBIT FB521 Li-ion battery replica with 3.87V and 162mAh/0.627WH capacity.

The high quality replica battery with 162mAh/0.627WH capacity, Smart Watch Batteries. It fits in the Fitbit Sense 2 / Versa4 Smartwatch models.

Usually the installation of this battery in connection with the phone requires extra hands-on skills, we recommend that you have the Fitbit Sense 2 / Versa4 Smartwatch battery installed by an expert.

This battery is suitable as a replacement battery for Fitbit Sense 2 / Versa4 Smartwatch battery and FITBIT FB521 model.

High capacity FITBIT FB521 battery for longer standby time.

The battery is professionally tested to ensure the best lifespan.

1 year warranty, 30 days money back, 100% brand new!

Battery capacity (mAh/A/W) may be different; the more mAh/A/W it displays, the higher its autonomy.

Safety certified CE / FCC / RoHS.

* Please make sure that the replacement battery you are buying is suitable for your device brand and model.

security

FITBIT FB521 Battery Technical Specifications

3
Model FB521
Battery Condition Brand New Replacement Battery
Item Code 25BA0106_Oth
Category Smart Watch Batteries
Brand FITBIT
Capacity 162mAh/0.627WH
Voltage 3.87V
Type Li-ion
Color White
Size *mm(L x W x H)
Applies to Fitbit Sense 2 / Versa4 Smartwatch
Certification Passed CE, UL, ROHS, ISO 9001/9002 and GS certification
Service Buy now, we promise a one-year warranty and 30-day returns

Replacement Part Numbers:

Compatible Models：

For Fitbit Sense 2 / Versa4 Smartwatch

More FB521 From Other Stores:

Battery For FB521

FITBIT FB521 Battery Our Guarantee

-- 30 days money back, 12 months warranty.

-- 30% off and free shipping

-- 100% compatible Fitbit Sense 2 / Versa4 Smartwatch

Product Features:

✅ 100% compatible with original equipment — easy installation and stable performance.

✅ Built-in overvoltage protection circuit to prevent damage to your device.

✅ Strictly tested during production to ensure top performance and reliability.

✅ Perfect replacement for the original part — same fit, same function.

Why order batteries from us?

① Expert in the field of batteries for 15 years.

② Large selection, almost all available products are in stock.

③ Tested and checked by competent professionals, careful packaging.

④ Best prices & fast delivery & One year warranty & Safe purchase and payment.

⑤ Perfect after-sales service.

Singapore Online Battery Store

Delivery

All items come with free shipping, with no minimum order required.

  • Standard delivery orders for in-stock items will be dispatched within 1–2 business days.
  • Tracking information will be available the day after shipment. Customers will receive an email with the tracking number.
  • Delivery typically takes 7–20 business days, depending on the destination.
  • Public holidays and customs inspections may cause postal delays.
  • We do not ship to APO or FPO addresses.
  • We are not responsible for incorrect or undeliverable addresses. Please ensure your shipping details are accurate and complete.

Methods of payment

Paypal

Accept payments through PayPal

PayPal has become one of the largest payment service providers in the world, comparable to Visa and MasterCard. With PayPal, you can accept credit cards as well as PayPal's own payment method.

It's a fast and secure way for customers to pay online via all major debit and credit cards, online bank transfers and via PayPal account holder payments. Customers don't even need a PayPal account to pay with PayPal.

Guarantee

Quality and safety: This FITBIT FB521 battery contains advanced electronic components and has been tested according to strict CE standards. The FITBIT FB521 battery contains a chip that prevents overcharging and short circuiting. On top of that the FITBIT FB521 batteries are made from good quality cells which do not suffer from a 'memory effect'.

Assurance and warranty: FITBIT FB521 purchased in our store are guaranteed for 12 months. Satisfied Refunded 30 days.

Shipped Direct from the Factory: Shopbatterypc.com ships its items almost directly from the factory, so you are sure to receive a brand new, full capacity battery! and Minimize your cost and get incredible low factory price.

Secure payment: Your credit card details are encrypted using the SSL (Secure Socket Layer) protocol and are never transmitted unencrypted over the network.

Battery FAQs

1. Can I use this FITBIT FB521 battery with any device?
This battery is designed for specific models. Please check the compatibility list before purchasing.
2. How long does the battery last on a full charge?
Battery life varies depending on usage and device settings. On average, it provides 6–10 hours of continuous use.
3. Is it safe to leave the battery charging overnight?
While the battery has built-in protection, we recommend unplugging it once fully charged to extend its lifespan.
4. What should I do if the FITBIT FB521 battery gets hot?
Stop using the device immediately and allow the battery to cool down. Avoid charging in direct sunlight or near heat sources.
5. How do I dispose of the battery?
Please follow local recycling guidelines. Do not throw batteries in household waste, as they may harm the environment.

Tips for using your battery safely

  1. Use the correct charger — Always use the charger recommended by the manufacturer to avoid overheating or damage.
  2. Avoid overcharging — Disconnect the battery once fully charged to extend its lifespan.
  3. Keep away from extreme temperatures — Do not expose the battery to direct sunlight, fire, or freezing conditions.
  4. Protect from moisture — Keep the battery dry and avoid contact with water or other liquids.
  5. Do not disassemble or puncture — Tampering with the battery may cause leakage, fire, or explosion.
  6. Dispose responsibly — Follow local regulations for battery recycling or disposal to protect the environment.