About this replacement
JMS OT-701 Infusion Pump — 10.8V Ni-MH Replacement Battery (9N-1200SCK)
This 10.8V 3000mAh Ni-MH battery replaces the OEM 9N-1200SCK in JMS infusion pump models OT-701, OT-707, and OT-601. It restores cordless operation to units where the original cell has lost capacity or failed outright. Voltage and capacity match the OEM specification exactly — 10.8V, 3000mAh (32.4Wh).
- OT-701, OT-707, and OT-601 fitment: These three models share the same battery bay geometry, connector pinout, and BMS communication protocol, which is why one cell covers all three. The 9N-1200SCK form factor fits all variants without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the OT-701 platform. The BMS accepted the cell without fault flags, completed its initialization handshake, and held voltage within the acceptable window across a full discharge curve.
- Post-installation self-test protocol: After fitting this battery, allow the infusion pump to complete its full power-on self-test without interruption. JMS pump firmware runs a BMS verification sequence at startup — cutting power during this window triggers a persistent battery fault that will not clear until the device completes a clean reboot cycle.
Device not completing boot sequence on first use with a new battery
The JMS OT-701's BMS runs a chemistry verification check at startup. A new Ni-MH cell that has partially self-discharged during storage may present a resting voltage below the threshold the pump expects at boot. The firmware interprets this as a fault and halts the startup sequence before the device reaches the main screen. Charge the battery to full before the first installation — do not insert it directly from packaging and attempt to boot.
Low battery alarm triggering immediately after a confirmed full charge
This happens because the OT-701's BMS compares internal resistance readings against thresholds calibrated for a conditioned cell. A brand-new Ni-MH cell has not completed its break-in cycle, so internal resistance reads higher than the BMS expects from a healthy battery. The pump alarm fires based on resistance, not just voltage — which is why the alarm appears even when the cell is fully charged. Run one complete charge-discharge cycle on the device before clinical use; resistance drops to within spec and the alarm clears.