Sharp CL905 Cordless Phone Replacement Battery 3.6V 2000mAh

Sharp CL905 / CL960ID / CL980ID Series — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 2000mAh Ni-MH rechargeable battery for Sharp cordless phone handsets. It fits the CL905, CL9601D, CL960ID, and CL980ID models. Dimensions are 53.60 x 42.45 x 15.32mm — verify your original battery matches before ordering.

• CL905 / CL960ID / CL980ID series fit: These handsets share the same 3.6V single-cell Ni-MH pack format, connector orientation, and charging circuit. The base station delivers a trickle charge matched to this cell count — swapping to a different voltage will confuse the charge controller.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a Ni-MH compatible analyser. The BMS held cutoff correctly at low-voltage thresholds, and the pack accepted charge from a 3.6V trickle base station without tripping the protection circuit.
• First charge on new Ni-MH handset packs: Place the handset in the base immediately after installing and leave it for a full 16 hours before first use. Ni-MH cells in cordless phones ship partially discharged — a slow initial charge allows the cells to balance and reach rated capacity.

Talk time shorter than expected after the first few charges

Ni-MH cells do not deliver full rated capacity on the first one or two cycles. The chemistry needs three to five full charge-discharge cycles before the cells reach their rated 2000mAh. Do not judge the pack after day one. Run the handset until it drops, return it to the base for a full charge, and repeat — capacity climbs each cycle until it stabilises.

Base station charge light not activating with new pack installed

Ni-MH packs stored before sale self-discharge over time. If the resting voltage drops far enough, some Sharp base stations will not recognise the pack as chargeable and the charge indicator stays off. Remove the handset, wait 10 seconds, and reseat it firmly — a brief contact break can trigger the charging circuit to re-poll. If the light still does not come on, check that the handset contacts are clean and the pack voltage reads at least 3.0V with a multimeter before assuming a fault.