Salomon Custom Heat Ski Boot Replacement Battery 3.7V 3600mAh

Salomon Custom Heat Ski Boots — 3.7V Li-ion Replacement Battery (BAKTH-763448A-1S2P-2M)

This 3.7V, 3600mAh Li-ion battery is a direct replacement for the integrated heating system in Salomon Custom Heat ski boots. It powers the resistive heating elements that warm the foot and lower leg during cold-weather use. Swap it in when the original cell no longer holds enough charge to run the heating system through a full session.

• Custom Heat boot compatibility: Salomon's Custom Heat system uses a specific dual-cell 1S2P configuration — two cells in parallel at 3.7V nominal. This pack matches that layout exactly, so the BMS in the boot recognises it and allows all heat settings to operate as intended.
• Bench tested on actual hardware: We cycled this pack through all three heat levels and confirmed the BMS handshake cleared on each. At the highest setting, the sustained current draw pushed the pack to its thermal floor without triggering a protection cutoff — the cell chemistry handles the load.
• Cold-soak storage before your first ski day: If the boots sit in a cold car overnight before use, the Li-ion cells lose measurable capacity before you even clip in. Store the boots — or at minimum the battery pack — at room temperature the night before. Cold cells start at reduced voltage and the system may drop to a lower heat mode sooner than expected.

Why the Custom Heat system steps down from max heat mid-run

The boot's BMS monitors cell voltage in real time. On the highest heat setting, current draw is sustained and significant — a partially degraded or cold-soaked cell drops in voltage faster than a fresh, warm cell. When voltage sags below the BMS threshold, the controller steps the system down to a lower heat level to protect the cell. This is not a fault — it is the protection circuit doing its job. A fresh 3600mAh pack at operating temperature holds voltage higher for longer, keeping the system on max heat through more of your run.

Heating elements stop responding but the indicator light stays on

The indicator LED draws almost no current, so it stays lit even when the battery can no longer supply enough voltage to fire the heating elements. This creates the misleading appearance of a charged battery that simply will not heat. The cause is a cell that reads adequate open-circuit voltage but collapses under load — a classic end-of-life Li-ion symptom. Test by pressing the heat button immediately after a full charge: if the elements do not warm within 60 seconds, the cell is failing under load and needs replacement. A fresh pack at 4.2V fully charged resolves this immediately.