About this replacement
Macna Gloves 12V 3A 3 — 11.1V Li-Polymer Replacement Battery (K-BAT-12VOLT-3.0A)
This 11.1V 3000mAh Li-Polymer battery replaces the pack in the Macna heated gloves 12V 3A 3. It powers the gloves' heating elements directly, restoring warmth output when the original cell has degraded or failed. Capacity is 3000mAh (33.3Wh), matching the original specification.
- Macna 12V 3A 3 glove compatibility: These gloves use a three-cell Li-Polymer pack at a nominal 11.1V to feed the heating elements at each heat setting. The connector, cell count, and BMS handshake match the original pack, so the controller reads state of charge correctly across all settings.
- Bench tested on actual hardware: We ran the pack through full charge cycles and load tested it at sustained draw across low, medium, and high heat settings. The BMS held within spec at each stage and the protection circuit tripped correctly at the low-voltage cutoff threshold.
- First use on a new pack: Start on the lowest heat setting for the first 10 minutes — the heating elements pull significant current at maximum, and a fresh cell benefits from a short period at lower draw before full power operation.
Heating element cutting out mid-use on maximum setting
The Macna 12V 3A 3 controller monitors pack voltage in real time. At maximum heat, the elements draw sustained high current, which causes voltage to sag on any cell that has degraded even slightly. When pack voltage drops below the BMS protection threshold, the circuit cuts power to the elements to prevent cell damage. A new pack at full charge runs the full high-heat cycle without tripping this cutoff — if cutouts persist, confirm the pack is charged above 12.4V before use.
Gloves not reaching maximum heat level even on a charged pack
If the gloves run warm on low or medium but feel weak on high, the pack voltage under load is the first thing to check. A partially degraded cell may rest at 12.4V off the charger but sag to 10.5V or below once the high-heat elements pull full current — the controller then steps down output to protect the cells. This can happen even if the battery indicator shows full. Charge the pack to 12.6V (full Li-Polymer charge on a three-cell pack) and test immediately on high to confirm the sag is resolved.