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Rectangular lithium-polymer battery pack with wires, 3.85V 150mAh, for Fitbit Versa FB504 FB505

MPF Products

MPF Products 150mAh 3.85V Battery for Fitbit Versa FB504 FB505

SKU CH-C0SH-XXWD6

A 3.85V 150mAh lithium-polymer replacement battery for Fitbit Versa FB504 and FB505, includes installation tools

  • OS CompatibilityIntended for/Compatible with the Following Smartwatch Models
  • Specification3.85V 150mAh 0.58Wh Lithium-Polymer Rechargeable Battery Pac
  • FeaturesIncludes Free Installation Tools.
  • Restores full runtime with 150mAh 3.85V lithium-polymer cell
  • Fits Fitbit Versa FB504 and Special Edition FB505 exactly
  • Replaces original part numbers SP271828SF, R-41021555, 261827
  • Ready to install with included free tools
  • Delivers 0.58Wh capacity for reliable daily use

Replacement Battery for Fitbit Versa FB504 FB505

This 3.85V 150mAh lithium-polymer pack replaces the original R-41021555 SP271828SF 261827 cell inside Fitbit Versa and Versa Special Edition smartwatches. It restores the 0.58Wh capacity the watch shipped with when new. The kit includes installation tools so you can open the case and swap the cell without sourcing extra equipment. Buyers whose watch is a different Fitbit model or a non-Fitbit wearable cannot use this battery.

Check Your Watch Model Before Ordering

Verify the model number on the back of your device matches FB504 or FB505 exactly. Confirm the original battery part number printed on the old cell is R-41021555 SP271828SF or 261827. Ensure you are comfortable prying open a sealed smartwatch case and disconnecting a fragile flex cable. If the watch shows water damage or a swollen battery, take extra safety precautions and consider professional service instead.

Fits Inside the Original Versa Case

The pack is shaped to sit in the existing battery cavity with the same connector orientation as the factory cell. No soldering is required; the replacement plugs into the same board socket. Installation tools supplied in the kit handle the case clips and tiny screws. Once fitted the watch regains its original runtime between charges. This part does not add extra capacity or change the charging voltage.

Highlights

  • Restores full runtime with 150mAh 3.85V lithium-polymer cell
  • Fits Fitbit Versa FB504 and Special Edition FB505 exactly
  • Replaces original part numbers SP271828SF, R-41021555, 261827
  • Ready to install with included free tools
  • Delivers 0.58Wh capacity for reliable daily use

Specifications

BrandMPF Products
Part NumberReplacement for the Following Battery Model/Part Numbers: SP271828SF.
OS CompatibilityIntended for/Compatible with the Following Smartwatch Models: Fitbit Versa (FB504), Fitbit Versa Special Edition (FB505).
Specification3.85V 150mAh 0.58Wh Lithium-Polymer Rechargeable Battery Pack.
FeaturesIncludes Free Installation Tools.

Questions about this item

Does the package include the tools needed to open the Fitbit Versa FB504?

Yes, the package includes free installation tools so you can replace the battery without buying anything extra.

Which battery part numbers does this replacement cover for the Versa FB505?

It replaces the original R-41021555, SP271828SF and 261827 cells used in the Versa Special Edition FB505.

What runtime can I expect from the 3.85 V 150 mAh cell in a Fitbit Versa FB504?

The 0.58 Wh lithium-polymer pack restores the original capacity, giving the same daily battery life the watch had when new.

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