Hamilton C2 Ventilator 14.4V Replacement Battery 7800mAh Li-ion

Hamilton C2 / C3 Ventilator — 14.4V Li-ion Replacement Battery

This 14.4V Li-ion battery delivers 7800mAh (112.32Wh) of capacity for the Hamilton C2 and C3 ventilators. It fits both the standard C2 and C3 platforms used in hospital, transport, and homecare settings. The cell format and connector match the original battery pack dimensions: 167.00 × 107.10 × 21.00mm.

• C2 and C3 platform compatibility: Both ventilator models share the same 14.4V battery bay, connector pinout, and BMS communication protocol. A single cell chemistry and capacity rating covers both units without hardware modification.
• Bench tested on actual hardware: We cycled this battery under the Hamilton ventilator's variable load profile — including compressor draw and alarm states. The BMS held cutoff thresholds within spec and passed charge-state reporting back to the device display correctly.
• Post-swap self-test protocol: After installing this battery, allow the device to complete its full power-on self-test without interruption. The Hamilton C2 and C3 run a BMS verification sequence at startup — cutting power during this window registers a false battery fault that persists until a complete reboot and re-test cycle.

Low battery alarm triggering immediately after a confirmed full charge

The Hamilton C2 BMS applies an OEM-calibrated threshold when it evaluates a newly installed cell. A fresh Li-ion cell's internal resistance profile differs slightly from a cycled OEM pack, and the device's charge-state algorithm can interpret this as below threshold on the first read. Run one full charge-discharge cycle on the ventilator before treating the alarm as a genuine fault. After that conditioning cycle, the BMS recalibrates its state-of-charge baseline and the low battery flag clears at the correct voltage — typically above 13.5V on a full charge.

Device will not power on after battery sat in storage

Li-ion cells self-discharge during extended storage. If voltage drops below approximately 10V, the Hamilton BMS enters a protection lockout and will not pass current to the device on startup. Connect the battery to the ventilator's AC mains supply and leave it on charge for a minimum of two hours before attempting to power on. The charge IC applies a low-current pre-charge phase to recover cells in this range, bringing them back above the BMS re-enable threshold of around 12V before switching to full charge current.