Macna K-BAT-7.4VOLT-3.0A Heated Gloves Compatible Battery 7.4V 3000mAh

Macna Gloves & Socks — 7.4V Li-Polymer Replacement Battery (K-BAT-7.4VOLT-3.0A)

This is a 7.4V, 3000mAh (22.2Wh) Li-Polymer replacement battery for the Macna heated gloves and socks system. It slots into the original battery housing and powers the heating elements through the existing connector. Capacity matches the OEM specification listed against part number K-BAT-7.4VOLT-3.0A.

• Gloves and socks on the same pack: Both the glove and sock variants in the Macna heated range share the same 7.4V nominal rail and connector format. The heating elements in each garment are tuned to this voltage — running either on a mismatched voltage risks element damage or no heat output at all.
• Bench tested on actual hardware: We cycled this cell through all three heat settings and confirmed the BMS held stable under sustained high-setting draw. The pack reached cut-off voltage without tripping prematurely and accepted a full charge without thermal event.
• First use on cold-weather days: Start on the lowest heat setting for the first 10 minutes when using a new or newly charged battery in freezing conditions. Li-Polymer cells deliver lower peak current when cold — starting on maximum heat immediately can trigger the BMS protection circuit before the cell warms to operating temperature.

Heating element cutting out mid-use on maximum setting

The maximum heat setting on the Macna gloves draws sustained high current — significantly more than the low or medium settings. If the battery cell has aged or the ambient temperature is very low, internal resistance rises and the BMS reads a voltage sag that crosses its protection threshold. The circuit opens to prevent cell damage, which kills heat output instantly even though the battery still shows charge. Switching to medium setting and allowing the pack 60 seconds to recover before returning to high will often reset the BMS without removing the battery.

Battery draining noticeably faster than rated on high heat

High heat setting draws roughly three to four times the current of low setting — this is not a fault, it is the physics of resistive heating elements at full power. A 3000mAh cell at high draw will deplete its usable capacity far faster than the same cell trickle-loaded on low. In sub-zero conditions this gap widens further because cold reduces the lithium polymer cell's deliverable capacity below its rated 22.2Wh. Keeping the battery pack tucked inside a sleeve or close to the body preserves cell temperature and recovers a measurable portion of that lost capacity.