About this replacement
Drager Infinity Monitor Gamma Series — 14.4V Li-ion Replacement Battery (MS30502)
This is a 14.4V, 5200mAh Li-ion replacement battery for the Drager Infinity Monitor Gamma and Gamma XL portable patient monitors. It fits models MS31385 and other Infinity Gamma variants. The pack matches the OEM voltage rail and connector spec for these clinical vital signs monitors.
- Gamma and Gamma XL compatibility: Both the standard Gamma and the XL variant share the same 14.4V battery bay, connector pinout, and BMS handshake protocol. The MS30502 part number covers the full Gamma platform — no hardware modification needed to seat the pack correctly.
- Bench tested on actual hardware: We ran a full charge-discharge cycle on this pack and confirmed the BMS communicates state-of-charge data to the monitor correctly. The charge IC accepted the cell without fault codes on our test unit.
- Post-swap self-test requirement: After installing this battery, allow the Infinity Monitor to complete its full power-on self-test without interruption. The monitor's BMS verification runs at startup — cutting power during this sequence triggers a persistent false battery fault that won't clear until a clean reboot with the self-test allowed to finish.
Charge indicator stuck below 100% on first charge after installation
The Infinity Monitor's charge IC applies a conservative current limit when it encounters a new cell pack, particularly one that shipped at partial state of charge. This is normal behaviour — the charge controller is profiling the new cell before committing to a full charge rate. The indicator will reach 100% after the first complete charge cycle finishes. Do not remove the battery mid-charge expecting a reset; let the cycle complete fully before drawing any conclusions about capacity.
Monitor alarming low battery immediately after confirmed full charge
This alarm fires when the BMS self-test threshold comparison fails against expected OEM cell characteristics — a new cell hasn't yet built the charge history the monitor uses to validate state-of-charge readings. The monitor is comparing a fresh cell's internal resistance profile against a learned baseline that doesn't exist yet. Run one full charge-discharge cycle before clinical use; this allows the BMS to complete its learn sequence. After that cycle, the alarm clears and the monitor reports correctly from approximately 16.4V at full charge down to the 12V low-battery cutoff.