About this replacement
Drager Infinity Monitor Gamma — 14.4V Li-ion Replacement Battery (MS30502)
This 14.4V, 6800mAh Li-ion battery replaces the OEM MS30502 cell in the Drager Infinity Monitor Gamma and Infinity Monitor Gamma XL patient monitoring systems. It fits the MS31385 platform and related Infinity Gamma variants used in clinical and transport settings. Voltage and capacity match OEM spec to keep the monitor's BMS satisfied during power-on handshake.
- Infinity Gamma platform compatibility: The Gamma and Gamma XL share the same 14.4V battery bay and BMS communication protocol. All listed models use the MS30502 form factor — same connector, same cell count, same BMS handshake sequence. No modifications needed.
- Bench tested on actual hardware: We ran charge and discharge cycles on the Infinity Gamma platform and confirmed the BMS accepted the cell without fault codes. The protection circuit handled load transitions correctly across the monitor's full parameter-logging workload.
- Post-installation self-test protocol: After fitting this battery, allow the Infinity Gamma to complete its full power-on self-test without interruption. The BMS runs a verification cycle at startup — cutting power before it finishes logs a false battery fault that persists until the next clean reboot.
Device not completing boot sequence after battery swap
The Infinity Gamma runs a BMS verification step early in its boot sequence. A new cell that hasn't completed its first full charge cycle may sit just below the BMS acceptance threshold, causing the monitor to halt mid-boot. This is a BMS learn-cycle issue, not a faulty battery. Charge the battery fully in the monitor before the first clinical use — the BMS recalibrates on that initial cycle and the boot sequence completes normally from that point forward.
Low battery alarm triggered immediately after a confirmed full charge
The Infinity Gamma's BMS compares the cell's state-of-charge against an OEM chemistry profile stored in firmware. A fresh replacement cell hasn't yet established the charge/discharge curve the BMS expects, so the monitor alarms even when the cell is genuinely full. Run one complete charge-discharge cycle through the monitor before clinical deployment. After that conditioning cycle, the BMS maps the new cell correctly and the alarm threshold stops triggering at full charge.