Therm-IC T46-0900-001 Replacement Battery 3.7V 3600mAh

Therm-IC Heated Gloves — 3.7V Li-ion Replacement Battery (T46-0900-001)

This 3.7V, 3600mAh Li-ion battery replaces the T46-0900-001 cell in Therm-IC heated gloves. It powers the resistive heating elements built into the glove lining. When the original cell can no longer hold a charge or fails to reach full heat output, this is the direct replacement.

• Therm-IC heated glove fit: These gloves use a compact single-cell Li-ion pack at 3.7V nominal. The T46-0900-001 part number ties the battery to a specific connector, physical form factor, and BMS handshake — swapping to a mismatched cell will either fail to register or disable heating entirely.
• Bench tested on actual hardware: We cycled this cell through low, medium, and maximum heat settings while monitoring the BMS cutoff thresholds. The protection circuit held within spec across all three draw levels, with no unexpected shutdowns during sustained high-setting runs.
• Cold-weather storage between sessions: Li-ion cells stored at full charge in sub-zero conditions accelerate cathode stress. Store this pack at roughly 50% charge when the gloves won't be used for more than a week in cold environments — a full charge left idle in freezing temperatures shortens cell life faster than normal cycling.

Why Therm-IC gloves cut out mid-use on the highest heat setting

Maximum heat draws sustained high current through the resistive elements — significantly more than medium or low settings. If the cell voltage sags under that load and drops below the BMS cutoff threshold, the protection circuit shuts the output down before the cell is actually empty. An aged or cold cell hits that sag point much earlier in the discharge curve. A fresh, fully charged cell at 3.7V nominal gives the BMS enough headroom to sustain max output without tripping.

Gloves charge fully but won't reach maximum heat level

This is a different fault from mid-use cutout. Here, the cell holds a surface charge but its actual deliverable capacity has degraded — it reads full on the indicator but can't supply the current the highest heat setting demands. The BMS throttles output rather than shut off completely, so the glove stays warm but never gets hot. Check resting voltage after a full charge with a multimeter: a healthy cell should read 4.1–4.2V. Anything consistently below 4.0V after a full charge cycle means the cell needs replacing.