Geemarc CC40 Cordless Phone Replacement Battery 3.6V 700mAh

Geemarc CC40 / CC50 / CC60 — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 700mAh Ni-MH battery for the Geemarc CC40, CC50, and CC60 cordless phone handsets. It slots directly into the handset battery compartment and restores wireless operation to the phone. Swap it in when the original pack no longer holds a charge or the handset dies faster than expected.

• CC40, CC50, and CC60 compatibility: These three Geemarc models share the same handset housing, battery bay dimensions, and 3.6V three-cell Ni-MH voltage rail. The connector orientation and cell count are identical across all three, so one pack covers the full range.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on the CC40 handset. The base station accepted the charge handshake without fault lights, and the BMS held steady through full depletion without triggering an early cutoff.
• First charge after install: Place the handset in the base immediately after fitting this battery and leave it for a full 16 hours before use. Ni-MH cells shipped in storage state sit below the base station's acceptance threshold — a slow first charge brings all three cells to balanced capacity and avoids a permanently short first cycle.

Range dropping after fitting a new Ni-MH pack

DECT handsets draw a burst of current each time they transmit to the base station. A Ni-MH cell in its first few cycles has higher internal resistance than a conditioned pack, so voltage sags under that RF transmit load. When voltage dips, the handset reduces transmit power to protect the circuit, and range shrinks as a result. After three to five full charge-discharge cycles, internal resistance drops and the voltage holds firm under load — range returns to normal without any settings change.

Base station showing a charge error or fault light on a new battery

A new Ni-MH pack from storage can arrive at 3.0V or lower across the three cells. Some Geemarc base stations check terminal voltage before starting a charge cycle and reject packs that read below roughly 3.2V. The fix is to seat the handset firmly in the base and leave it undisturbed — most units will trickle at a low rate for 20 to 30 minutes until the pack rises above the threshold, then switch to normal charge. If the error light stays on past an hour, remove the handset, wait 60 seconds, and reseat it to trigger a fresh voltage check.