Geemarc CC40 Replacement Battery 2.4V 750mAh Ni-MH

Geemarc CC40 / CC50 / CC60 — 2.4V Ni-MH Replacement Battery

This is a 2.4V 750mAh Ni-MH battery for the Geemarc CC40, CC50, and CC60 cordless phone handsets. It replaces the original cell pack that powers the handset during calls and standby. When the factory battery no longer holds charge, this swap restores the handset to working condition without replacing the whole phone.

• CC40, CC50, and CC60 compatibility: All three models share the same 2.4V two-cell Ni-MH pack format with matching connector and physical dimensions (44.07 × 20.35 × 10.58mm), so one battery fits all three handset variants.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on the base station circuit. The cell voltage climbed correctly through the Ni-MH charge curve and the base station terminated charge without fault.
• First-charge protocol for Ni-MH cordless packs: After fitting this battery, seat the handset in the base and leave it there for a full 16 hours before first use. Ni-MH cells shipped from storage are partially discharged — a slow initial charge lets them reach rated capacity. Skipping this step means the first few talk sessions will feel short; that is not a fault.

Base station charge light not activating after installing a new Ni-MH pack

Geemarc base stations use a delta-V detection circuit to confirm a Ni-MH pack is present and accepting charge. A battery stored at low voltage can sit below the threshold that triggers the charging circuit to engage. If the charge indicator stays off, remove the handset, wait 10 seconds, and reseat it firmly — the base re-samples voltage on contact. If the light still does not activate, the resting cell voltage is likely under 1.8V total; place the handset in the base for 30 minutes and check again, as trickle current will bring the pack up to the detection threshold.

Range drops noticeably during a call after swapping the battery

The CC40 DECT radio draws a surge of current each time it transmits a burst. On a fresh or well-conditioned Ni-MH pack this is handled without issue, but on a pack that has not completed its first full charge cycles, internal resistance is higher and voltage sags under that RF load. The handset reads low voltage, backs off transmit power, and range shrinks. Run three to five full charge-and-use cycles — place the handset in the base until fully charged, use it until the low-battery tone sounds, then recharge fully. After those cycles, internal resistance drops and voltage sag under transmit load reduces.