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Small rectangular lithium-polymer battery pack with installation tools

MPF Products

MPF Products 70mAh LSSP031420AB Replacement Battery for Fitbit Charge HR FB405

SKU CH-6718-QC31N

70 mAh lithium-polymer replacement battery for Fitbit Charge HR FB405 models with installation tools included

  • TypeReplacement Battery
  • OS CompatibilityCompatible with the Following Fitbit Wristband Watch Models:
  • Battery TypeLi-polymer Battery
  • Specification3.7V 70mAh 0.26Wh Lithium-Poly Rechargeable Battery Pack.
  • FeaturesIncludes Free Installation Tools.
  • Restores tracker runtime with a 70mAh 3.7V lithium-polymer cell
  • Direct replacement for LSSP031420AB part number in Fitbit Charge HR
  • Fits all FB405 variants including FB405BKS FB405BKL FB405BKXL
  • Supplied with free installation tools for straightforward self-repair
  • Delivers 0.26Wh capacity matching original battery specification

Replacement Battery for Fitbit Charge HR

This 3.7V 70mAh lithium-polymer pack replaces the original LSSP031420AB cell inside Fitbit Charge HR and FB405 series trackers. It restores power to wristbands that no longer hold a charge through daily activity tracking.

Limited to Single-Model Compatibility

The battery fits only the listed Fitbit Charge HR variants and cannot be used in other Fitbit lines or competing wearables. Installation requires opening the sealed band, which voids any remaining device warranty and risks water-resistance loss.

70mAh Capacity Defines Runtime

The 0.26Wh rating determines how long the tracker runs between charges under typical heart-rate monitoring. Buyers needing multi-day endurance beyond the original specification will not gain extra runtime from this direct-capacity replacement.

Highlights

  • Restores tracker runtime with a 70mAh 3.7V lithium-polymer cell
  • Direct replacement for LSSP031420AB part number in Fitbit Charge HR
  • Fits all FB405 variants including FB405BKS FB405BKL FB405BKXL
  • Supplied with free installation tools for straightforward self-repair
  • Delivers 0.26Wh capacity matching original battery specification

Specifications

Part NumberReplacement for the Following Battery Model/Part Numbers: LSSP031420AB.
TypeReplacement Battery
OS CompatibilityCompatible with the Following Fitbit Wristband Watch Models: Fitbit Charge HR, FB405, FB405BKS, FB405BKL, FB405BKXL, FB405BUS, FB405BUL, FB405BUXL, FB405PKS, FB405PKL, FB405PMS, FB405PML, FB405PMXL, FB405TAS, FB405TAL, FB405TES, FB405TEL, FB405TEXL.
Battery TypeLi-polymer Battery
Specification3.7V 70mAh 0.26Wh Lithium-Poly Rechargeable Battery Pack.
FeaturesIncludes Free Installation Tools.

Questions about this item

How do I know this 70mAh LSSP031420AB battery fits my specific Fitbit Charge HR model?

The replacement is compatible with every listed FB405 variant including FB405BKS, FB405BKL, FB405BKXL, FB405BUS, FB405BUL, FB405BUXL, FB405PKS, FB405PKL, FB405PMS, FB405PML, FB405PMXL, FB405TAS, FB405TAL, FB405TES, FB405TEL and FB405TEXL.

What runtime can I expect from the 3.7V 70mAh 0.26Wh pack once installed in my tracker?

The 0.26Wh lithium-polymer cell restores the original capacity, so a full charge typically powers the Charge HR for the same five-day cycle the factory battery delivered when new.

Does the LSSP031420AB use a standard connector that plugs straight into the Charge HR board?

Yes, the pack is built to the exact LSSP031420AB specification with the matching plug, so it connects directly to the FB405 mainboard without adapters or soldering.

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