Title 1: FB521 Battery for Fitbit Sense 2 (162mAh 3.87V)
Title 2: Fitbit FB521 Battery Compatible with Model Fitbit Sense 2
Title 3: FB521 162mAh 3.87V for Fitbit Sense 2
Title 4: New FB521 Battery for Fitbit Sense 2
Title 5: Battery Replacement for Fitbit Sense 2 FB521
Need 162mAh Fitbit FB521 Battery? This FB521 battery 100% compatible with Fitbit Sense 2. We offer 12 months warranty on our all batteries! During this period, if your battery fails, we will replace your FB521 battery with a new one.
3.87V 162mAh FB521 Replacement Battery for Fitbit Sense 2
Technical Specifications:
Brand: for Fitbit
Voltage: 3.87V
Capacity: 162mAh
Cell Type: Li-ion
Battery Cell Quality: Grade A
Warranty: 1 Year Warranty, 30 Day Money Back and Secure Online Ordering Guaranteed
Certification:CE CCC FCC ROHS
This Fitbit FB521 Battery Replaces:
FB521
This FB521 Battery Fits The Following Alcatel Models:
for Fitbit Sense 2
for Fitbit Versa 4 Fitness Smartwatch
√ FB521 battery, 2000mAh charges quickly.
√ This unit is a 100% fully compatible Lithium-Ion replacement for the Fitbit FB521 Battery.
√ Brand new and high quality replacement Fitbit FB521 battery is built with the highest quality standards, safety features.
√ Batteries are lighter, more efficient and charge with no memory effect.
√ Each Fitbit FB521 replacement battery unit is made of high-quality lithium-ion cells for longer last time.
√ The battery is up to standard and fully compatible with original specifications.
√ All our batteries are certified by CE, UL, ROHS, ISO9001/9002 as safe products.
√ The interface metal and fixed insulator of the battery are made of good materials to ensure stable current input and durability.
How to extend the life of your Fitbit FB521 battery?
1.Please fully charge your device before using it for the first time. Because the Fitbit FB521 battery is normally shipped in a partially-charged state. Please cycle your battery pack by fully charge (more than 12hours) and discharge(less than 10%) for 3-5times to reach maximum rated capacity.
2.Please don’t discharge battery to 0%, which is the most common reason among faulty batteries. It will damage battery if the device usually works at a critical power level ( below 3%).
3.Charge the battery before it runs to 20%. It is scientifically justified that charging battery at 20% till 80% will extend battery life to the longest.
4.If your Fitbit FB521 battery won’t be used for a long time, please charge it once a month and keep battery power over 50%, remove it from your device and store it in an antistatic bag in a cool, dry place.
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