JCPenney 686-6015 Compatible Battery 12V 1800mAh Ni-MH

JCPenney 686-6015 / 686-6023 Series — 12V Ni-MH Replacement Battery

This is a 12V 1800mAh Ni-MH replacement battery for JCPenney portable medical devices including models 686-6015, 686-6023, 686-6062, 686-6232, and seven additional variants in the same series. Capacity is 1800mAh (21.6Wh), matching the original cell specification. The pack uses the same Ni-MH chemistry as the factory unit to maintain BMS compatibility across all listed models.

• 686-6015 series compatibility: These models share a common 12V power rail, connector format, and BMS handshake protocol. The charge controller on each device expects Ni-MH cell behaviour — specifically the delta-V termination signal — so substituting a different chemistry causes incorrect charge cutoff and false fault codes.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a 12V Ni-MH-compatible charge platform. The BMS accepted the cell, delta-V termination fired at the correct point, and no fault flags were raised across three consecutive cycles.
• Power-on self-test after installation: After fitting this battery, let the device complete its full startup self-test without interruption. Medical devices in this class run a BMS verification routine at boot. Interrupting it — even briefly cutting power — triggers a false battery fault that persists until the next clean reboot.

Charge indicator not reaching 100% on first charge with this battery

The charge IC in these JCPenney medical devices applies a conservative current limit when it detects a new or unfamiliar cell. On first charge, the controller may stop short of a full 100% indication and report a partial fill. This is the delta-V detection algorithm being cautious, not a faulty pack. Run one complete charge-discharge cycle and the charge controller recalibrates its endpoint. After that first cycle, the indicator should reach full charge consistently.

Device shuts off mid-use in the first week after battery swap

New Ni-MH cells deliver their full rated capacity only after the first 5–10 charge-discharge cycles. Before that break-in period, the BMS may read the cell voltage as dropping below the low-voltage cutoff threshold under load — even though the pack is not actually depleted. The device interprets this voltage sag as a critical battery condition and shuts down as a safety measure. Complete several full charge-discharge cycles under normal use, and the sag should reduce to a level the BMS no longer flags. If shutdown continues past cycle 10, check that the terminal voltage under load stays above 10.8V.