About this replacement
Hokanson EPG-0863 / EPG-52018 — 14.4V Ni-MH Replacement Battery (MD6VR)
This is a 14.4V, 2000mAh Ni-MH battery for the Hokanson EPG-0863 and EPG-52018 portable diagnostic instruments. It replaces OEM part numbers MD6VR and B11785. Both devices run from the same 14.4V battery platform and share an identical connector and BMS interface.
- EPG-0863 and EPG-52018 compatibility: Both models use the same 14.4V Ni-MH cell configuration, connector pinout, and BMS communication protocol. One battery covers both devices without modification.
- Bench tested on actual hardware: We cycled this battery through charge and load on the bench. The BMS accepted the cell, cleared charge status correctly, and held voltage within expected range across a full discharge curve. No false fault codes were triggered.
- Post-swap self-test protocol: After fitting this battery, let the device complete its full power-on self-test without interruption. The Hokanson EPG series runs a BMS verification sequence at startup. Cutting power during that window logs a battery fault that persists until the device completes a clean reboot cycle.
EPG device not completing boot sequence after battery swap
The EPG-0863 and EPG-52018 both run a startup BMS handshake that checks cell voltage against a stored threshold. A fresh Ni-MH cell that has partially self-discharged during shipping may sit just below that threshold, causing the device to stall mid-boot. This is not a faulty battery. Charge the new battery to full before the first installation, then reinstall and allow the boot cycle to finish without interruption. If the device still stalls, check that resting cell voltage is at or above 14.0V before powering on.
Low battery alarm triggers immediately after confirmed full charge
On the first few cycles, Ni-MH cells have not yet reached full charge capacity — the internal resistance is higher than a conditioned cell, and the BMS reads a steeper voltage drop under load than it expects from a healthy pack. The device interprets that drop as low battery and throws the alarm even though the cell is fully charged. This resolves after one complete charge-discharge cycle. Run one full cycle before using the device clinically — after that, the BMS calibrates to the cell's actual load curve and the alarm clears.