30% off all items on the site, 30 days money back, 1 year warranty

What Are You Looking For?

Your Cart

Your Shopping Cart is Empty!

Battery FB521 Compatible with Fitbit Sense 2 / Versa4 Smartwatch

Click image to open expanded view

Price: £18.88 £26.97
  • Model: FB521
  • SKU: 25BA0106_Oth
  • Availability: In Stock
  • Capacity: 162mAh/0.627WH
  • Voltage: 3.87V
  • Type: Li-ion
  • Color: White
  • Size: *mm(L x W x H)
  • Our batteries are 100% new and CE / FCC / RoHS certified for safety
  • We only use high quality materials and grade A cells to guarantee real capacity and higher recharge cycles.
  • Quick, friendly and hassle-free customer support and a full one-year warranty: if something goes wrong, we are at your disposal.
Quantity:
- +
Guarantee safe & Secure checkout
  • Free shipping apply to all
    orders over £ 9.9

  • Paypal guarantees 100%
    payment security

  • 30 days returns if you change
    your mind

Recent Products

AB660
HOT

Related Products

BL-S6
-30%
LG

BL-S6 for LG Watch Urbane 2nd Edition LTE Watch 5

£43.50 £62.14
Availability : In Stock
  • Capacity: 570MAH
  • Voltage: 3.85V
CTL1616 CTL1616F
-30%
  • Capacity: 18mAh
  • Voltage: 2.3V
APP00207
-30%
  • Capacity: 300mAh/1.14Wh
  • Voltage: 3.8V
T5
-30%
GARMIN

T5 for Garmin tt10 tt15 Dog Ring Battery

£19.99 £28.56
Availability : In Stock
  • Capacity: 3400mAh/12.58Wh
  • Voltage: 3.7V
BW53
-30%
XIAOMI

BW53 for Xiaomi Wtach S1 Pro

£18.99 £27.13
Availability : In Stock
  • Capacity: 486mAh/1.88Wh
  • Voltage: 3.87V
BW-A2
-30%
VIVO

BW-A2 for Vivo smart watch

£22.38 £31.97
Availability : In Stock
  • Capacity: 458mAh/1.76WH
  • Voltage: 3.85V
MT616 3027-29Y
-30%
SEIKO

MT616 3027-29Y for SEIKO MT616 3027-V1Z MT516F 3027-29Y

£28.99 £41.41
Availability : In Stock
  • Capacity:
  • Voltage:
BL-S5 VC200
-30%
LG

BL-S5 VC200 for LG GizmoGadget VC200 LG-VC200

£21.00 £30.00
Availability : In Stock
  • Capacity: 490mAh 1.8Wh
  • Voltage: 3.8V
361-00035-09
-30%
GARMIN

361-00035-09 for Garmin T5 mini TT 15 mini

£19.99 £28.56
Availability : In Stock
  • Capacity: 1200mAh/4.44Wh
  • Voltage: 3.7V
A2345
-30%
APPLE

A2345 for APPLE iWatch S6 40mm

£28.49 £40.70
Availability : In Stock
  • Capacity: 265.9mAh/1.024WH
  • Voltage: 3.85V
EB-BR380FBE
-30%
SAMSUNG

EB-BR380FBE for Samsung Galaxy Gear 2 SM-R380, SM-R381

£34.03 £48.61
Availability : In Stock
  • Capacity: 1.14Wh
  • Voltage:
361-00026-00
-30%
GARMIN

361-00026-00 for Garmin forerunner 205 305 sports GPS smartwatch

£20.50 £29.29
Availability : Out of Stock
  • Capacity: 720mAh 2.7Wh
  • Voltage: 3.7V
BL-S6
-30%
LG

BL-S6 for LG Watch Urbane 2nd Edition LTE Watch 5

£43.50 £62.14
Availability : In Stock
  • Capacity: 570MAH
  • Voltage: 3.85V
CTL1616 CTL1616F
-30%
  • Capacity: 18mAh
  • Voltage: 2.3V
APP00207
-30%
  • Capacity: 300mAh/1.14Wh
  • Voltage: 3.8V
T5
-30%
GARMIN

T5 for Garmin tt10 tt15 Dog Ring Battery

£19.99 £28.56
Availability : In Stock
  • Capacity: 3400mAh/12.58Wh
  • Voltage: 3.7V
BW53
-30%
XIAOMI

BW53 for Xiaomi Wtach S1 Pro

£18.99 £27.13
Availability : In Stock
  • Capacity: 486mAh/1.88Wh
  • Voltage: 3.87V
BW-A2
-30%
VIVO

BW-A2 for Vivo smart watch

£22.38 £31.97
Availability : In Stock
  • Capacity: 458mAh/1.76WH
  • Voltage: 3.85V
MT616 3027-29Y
-30%
SEIKO

MT616 3027-29Y for SEIKO MT616 3027-V1Z MT516F 3027-29Y

£28.99 £41.41
Availability : In Stock
  • Capacity:
  • Voltage:
BL-S5 VC200
-30%
LG

BL-S5 VC200 for LG GizmoGadget VC200 LG-VC200

£21.00 £30.00
Availability : In Stock
  • Capacity: 490mAh 1.8Wh
  • Voltage: 3.8V
361-00035-09
-30%
GARMIN

361-00035-09 for Garmin T5 mini TT 15 mini

£19.99 £28.56
Availability : In Stock
  • Capacity: 1200mAh/4.44Wh
  • Voltage: 3.7V
A2345
-30%
APPLE

A2345 for APPLE iWatch S6 40mm

£28.49 £40.70
Availability : In Stock
  • Capacity: 265.9mAh/1.024WH
  • Voltage: 3.85V

Fast Delivery

Shipping to Most Countries

safe payment

Paypal Secure Payment

Online Discount

30% Off All Batteries

Help Center

Contact Our Customer Service

Curated items

From Handpicked Manufacturers