About this replacement
GasClip MGC & MGC-PUMP Detectors — 3.7V Li-ion Replacement Battery (MGCBAT1)
This 3.7V, 1800mAh Li-ion cell replaces the original battery in the GasClip MGC and MGC-PUMP multi-gas detectors. It fits the MGC Pump Pellistor and MGC Pump IR variants. Swap it when the original pack no longer holds charge or the unit shuts down during monitoring shifts.
- MGC and MGC-PUMP compatibility: All four variants — standard MGC, MGC-PUMP, Pump Pellistor, and Pump IR — share the same 3.7V cell footprint and connector. The BMS handshake is identical across the range, so one part number covers all of them.
- Bench tested on actual hardware: We cycled this pack under sensor and pump load simultaneously. The BMS held voltage within spec through pellistor warm-up and IR emitter pulses — both the current spikes that cause weaker cells to trip.
- Post-install calibration step: After fitting this battery, run a full bump-test or calibration cycle through the MGC menu before field use. The detector maps battery state during that sequence — skipping it causes premature low-battery alerts during the first monitoring session even when the cell is fully charged.
BMS cutoff when the MGC-PUMP motor spins up
The pump motor in the MGC-PUMP draws a short current spike at start-up — higher than the steady running draw. Aged or partially discharged cells dip in voltage during that spike, which the BMS reads as an over-discharge event and shuts the pack down. This replacement cell maintains voltage above the BMS trip threshold through the inrush. If the unit still cuts out at pump start, check that the cell is above 3.6V before powering on — start-up from a shallow charge amplifies the sag.
MGC won't charge after sitting unused in a carry case for months
Li-ion cells self-discharge slowly in storage. If the MGC sat long enough, the cell voltage drops below the BMS recovery threshold — typically around 2.5V — and the charger sees no response from the pack. The BMS enters sleep mode and blocks charge current as a protection measure. Connect the unit to its dock for 10–15 minutes anyway; many chargers apply a low-current pre-charge pulse that wakes the BMS once cell voltage climbs back above 2.8V. If the charge indicator never activates after 20 minutes, the cell is below recovery voltage and the pack needs replacing.