Schneider CP900 Cordless Phone Compatible Battery 3.6V 750mAh

Schneider CP900 / CP900AM / CHS900 — 3.6V Ni-MH Replacement Battery

This 3.6V, 750mAh Ni-MH battery replaces the handset battery in the Schneider CP900, CP900AM, and CHS900 cordless DECT phones. It restores talk time and standby capacity to handsets where the original cell has degraded. Dimensions are 50.56 × 49.73 × 6.37mm — verify against your existing pack before fitting.

• CP900 / CP900AM / CHS900 fitment: These three handsets share the same battery bay dimensions, voltage rail, and connector orientation, which is why a single cell covers all three. The NiMH chemistry matches the charge current the base station delivers — swapping to Li-ion would overcharge and damage the handset.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the CP900 platform. The base station accepted the battery without error on the first seating, and the BMS held voltage within the expected NiMH flat discharge curve throughout the test.
• First charge on cordless NiMH packs: After fitting, seat the handset in the base and leave it for a full 16 hours before the first call. NiMH cells shipped in a partially discharged state — a slow initial charge lets each cell in the pack reach equal capacity, which directly affects how much talk time you get from cycle one onward.

Talk time shorter than original battery after replacement

NiMH cells do not hit rated capacity on the first cycle — or the second. The electrochemical structure needs three to five full charge-discharge cycles before the cell delivers its full 750mAh. If your CP900 handset feels like it runs out faster than the old battery did at its best, that is the expected break-in behaviour, not a fault. Run the handset down until it beeps low, then return it to the base for a full charge — repeat this three to five times and talk time will stabilise.

Base station charge light not coming on after fitting new battery

NiMH cells lose voltage during storage, and if the pack voltage drops low enough, the CP900 base station's charge circuit may not recognise it as a valid battery. The base expects to see a minimum voltage before it begins the charge cycle. Remove the handset, wait 10 seconds, then reseat it firmly — a clean contact seating is sometimes all it takes. If the charge light still does not come on, check that the battery terminals are clean and that the handset clicks fully into the cradle; a partial connection reads as no battery to the base.