About this replacement
Sennheiser G2 / EK1038 — 2.4V Ni-MH Replacement Battery (BA2015)
This is a 2.4V, 1500mAh Ni-MH replacement battery for the Sennheiser G2 wireless system. It fits the G2 bodypack transmitter, the EK1038 receiver, and the 2015FM unit. The BA2015 cell slot and connector match the original pack directly.
- G2, EK1038, and 2015FM compatibility: All three units share the same 2.4V Ni-MH cell format, identical footprint, and the same two-pin contact arrangement. Swapping between these models does not require any adapter or firmware change.
- Bench tested on actual hardware: We ran this pack in a G2 bodypack and cycled it through the base station charge circuit. The cell accepted a full charge without thermal event, and the base station cleared its charging indicator cleanly at end of cycle.
- First charge in the base station: Place the unit in the base station and let it complete one uninterrupted full charge before use. The G2 base needs to log the new cell before its talk-time indicator reads correctly — cutting that first charge short leaves the display permanently off by a wide margin.
Base station showing a charging error with the new pack fitted
The G2 base station monitors cell voltage at the start of each charge cycle. A new Ni-MH pack sitting at storage voltage — typically 2.0–2.1V — can register below the base's detection threshold, triggering an error flag before charging even starts. This is not a fault with the battery. Remove the unit, wait 10 seconds, and reseat it firmly so both contact pins make clean contact. If the error persists, check that the contacts on the bodypack are free of oxidation before reseating.
Headset cuts out mid-transmission on a fresh battery
Ni-MH cells deliver a flat discharge curve, but combined DECT radio draw and audio amplifier load in the G2 bodypack creates brief current spikes that a partially conditioned cell handles poorly. The result is a momentary voltage dip that trips the low-voltage cutoff — the unit drops the RF link and cuts out. This typically clears after three to five full charge-discharge cycles as the cell reaches its rated 1500mAh capacity. Cycle the pack fully three times and retest before assuming a fault.