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Small rectangular lithium-polymer battery pack with attached connector wires

MPF Products

MPF Products 100mAh LSSP491524AE Battery for Fitbit Surge wearable technology

SKU CH-3K5S-BVQT4

Replacement lithium-polymer battery pack for Fitbit Surge models, rated at 3.7V and 100mAh

  • Supported platformsCompatible with the Following Models: FitBit Surge, FB501, F
  • Spec summary3.7 V 60 mAh .22 Wh Lithium-Polymer Rechargeable Battery Pac
  • Product typeReplacement Battery
  • Restores full runtime with 100 mAh capacity
  • Direct replacement for LSSP491524AE part number
  • Fits Fitbit Surge FB501 and all listed variants
  • Delivers reliable power at 3.7 V lithium-polymer chemistry
  • Includes installation tools for straightforward battery swap

100 mAh Replacement Battery for Fitbit Surge

This lithium-polymer pack restores power to a Fitbit Surge fitness superwatch. It replaces the original LSSP491524AE cell and fits every listed FB501 variant. The 3.7 V, 100 mAh rating matches the factory specification. Installation tools are included, though a soldering iron is not.

Sustained daily tracking performance

The 37 Wh capacity supports continuous heart-rate monitoring, GPS logging and smart notifications through a full day of wear. Lithium-polymer chemistry maintains stable voltage under the steady, low-current draw typical of wrist-worn sensors. Recharge cycles remain consistent over months of overnight charging. No sudden voltage sag appears during extended exercise sessions.

3.7 V 100 mAh lithium-polymer specification

This single electrical rating decides whether the cell fits the Surge power-management circuit. A different voltage or capacity would break charging logic or safety limits. Buyers who need a higher-capacity pack for multi-day autonomy cannot use this part. The 100 mAh figure is the only compatibility gate.

How it compares

Measured against everything we stock in Smartwatches & Wearables, at today’s prices. Recalculated every night.

Price $4.99
Cheaper than about 99% of the 2,527 comparable items (median $44.99).

Specifications

Product
Brand nameMPF Products
Product lineFitbit
Model nameSurge
Part numberReplacement for the Following Battery Model/Part Numbers: LSSP491524AE.
Product typeReplacement Battery
Compatibility
Supported platformsCompatible with the Following Models: FitBit Surge, FB501, FB501BKS, FB501BKL, FB501BKXL, FB501BUS, FB501BUL, FB501BUXL, FB501TAS, FB501TAL, FB501TAXL.

Questions about this item

Does the 3.7V 100mAh lithium-polymer pack run hot or drain quickly during all-day wear?

The 3.7V 100mAh lithium-polymer pack is a direct replacement for the original LSSP491524AE cell, so it delivers the same low-heat, all-day runtime the Fitbit Surge was designed for.

What tools or parts do I need before I can install this replacement battery?

The package includes free installation tools; you only need to supply your own soldering iron to complete the swap.

Will this LSSP491524AE cell work in my older Fitbit Surge FB501BKL without modification?

Yes — the battery is listed as compatible with every Surge variant including FB501BKL, FB501BUL and FB501TAXL, so it fits the original compartment directly.

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