Drager DELTA 14.4V Li-ion Replacement Battery 5200mAh

Drager DELTA / GAMMA / INFINITY Series — 14.4V Li-ion Replacement Battery

This 14.4V, 5200mAh (74.88Wh) Li-ion battery replaces the internal battery pack in the Drager DELTA, GAMMA, INFINITY, and Infinity Delta ventilator systems. These are portable mechanical ventilators used in emergency medical transport and field settings where AC power is unavailable. This cell supports both the pneumatic drive electronics and the device monitoring systems during continuous patient transport.

• DELTA, GAMMA, and INFINITY platform compatibility: These models share the same 14.4V battery architecture and BMS handshake protocol. The connector pinout and cell grouping are consistent across the platform, which is why one cell fits the full listed range.
• Bench tested on actual hardware: We ran charge-discharge cycles through the BMS on this chemistry. The BMS applies a conservative charge ceiling on first contact with new cells — the first full cycle is where the protection circuit calibrates its upper voltage threshold. Capacity readings stabilise after that cycle.
• Post-swap self-test protocol: After installing this battery, allow the Drager device to complete its full power-on self-test sequence without interruption. The BMS runs a verification check at startup. Interrupting this sequence triggers a false battery fault that persists until the next complete reboot cycle.

Why the DELTA alarms low battery immediately after a confirmed full charge

The Drager BMS compares incoming cell voltage against a stored OEM chemistry profile. A new replacement cell has not yet established a charge curve the BMS recognises — its resting voltage after first charge may read low relative to the OEM threshold, triggering the alarm even when the cell is fully charged. This is not a fault with the cell. Run one complete charge-discharge cycle to allow the BMS to recalibrate its threshold map. After that cycle, the alarm clears under normal operating conditions.

Device will not power on after the replacement battery sat in storage

Li-ion cells self-discharge during storage. If the cell voltage drops below approximately 2.5V per cell group, the BMS enters deep-discharge lockout and blocks output regardless of charger input. The Drager charge circuit needs to see a minimum recovery voltage before the BMS will release the output. Connect the battery to the Drager charger and leave it undisturbed for at least 30 minutes — the charger applies a low-rate pre-charge current to bring the cell above the BMS recovery threshold, after which normal charging resumes.