CareFusion GW Pump CSA29109 Replacement Battery 7.2V

CareFusion GW Pump — 7.2V Ni-MH Replacement Battery (CSA29109)

This is a 7.2V, 2000mAh Ni-MH replacement battery for the CareFusion GW Pump and GW Volumetric Pump. It replaces OEM part numbers CSA29109, 1000EL00349, 1000SP01782, and 1000SP01794. Dimensions are 48.40 x 43.50 x 29.30mm — verify fitment against your unit before installation.

• GW Pump and GW Volumetric Pump compatibility: Both models run the same 7.2V Ni-MH battery architecture with a shared connector pinout and BMS handshake protocol, which is why a single cell serves both variants without hardware modification.
• Bench tested on actual hardware: We ran this cell through the GW Pump's charge cycle and monitored BMS communication at each stage. The protection circuit responded correctly to charge termination signals and flagged capacity accurately after one full conditioning cycle.
• Post-installation self-test cycle: After fitting this battery, let the pump complete its full power-on self-test without interruption. The GW Pump's BMS runs a verification routine at startup — cutting power during this sequence triggers a persistent false battery fault that won't clear until the next complete reboot.

Medical device alarming low battery with a freshly charged replacement

The GW Pump's BMS uses a charge-state threshold calibrated against a known OEM cell profile. A new replacement cell hasn't yet built a capacity history in the BMS register, so the device may flag a low-battery alarm even after a confirmed full charge. This is a learning-cycle issue, not a faulty battery. Run one complete charge-discharge-recharge cycle before clinical deployment — the BMS recalibrates its threshold and the alarm clears.

GW Pump won't power on after the battery sat in storage

Ni-MH cells self-discharge at roughly 1–2% per day. A battery stored for several months can drop below the GW Pump's BMS recovery threshold — typically around 5.4V — and the device will not boot. Connect the pump to mains power first and allow the charger to trickle-charge the cell back above threshold before attempting to power on from battery alone. Once the charge indicator moves past the first bar, the BMS has accepted the cell and normal charging resumes.