Panasonic P-P302 Cordless Phone Replacement Battery 3.6V 600mAh

Panasonic 23196 / KX-T38001 Series — 3.6V Ni-MH Replacement Battery (P-P302)

This is a 3.6V, 600mAh Ni-MH replacement battery for Panasonic cordless phones using part number P-P302. It fits the 23196, 23396, 435501, and KX-T38001 handsets, among others. Swap it in when the original pack no longer holds a charge and the handset cuts out mid-call.

• Shared platform — 23196, 23396, KX-T38001: These handsets run the same 3.6V single-cell NiMH architecture with an identical connector and cell footprint. One battery part number covers all of them because the voltage rail and physical form factor are the same across this Panasonic cordless family.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a Panasonic DECT base station. The BMS accepted the cell from the first charge cycle with no fault light, and capacity output tracked within spec by the third full cycle.
• First charge after installation: Place the handset in the base for a full 16 hours before first use. NiMH cells shipped from storage sit at a partial state of charge. The slow overnight charge allows the chemistry to reach rated capacity before you put it into regular use.

Talk time shorter than the original battery after replacement

NiMH cells do not deliver full rated capacity on the first cycle — this is normal chemistry behaviour, not a fault. The Panasonic base charges at a low trickle current, so the first three to five full charge-discharge cycles progressively condition the cell toward its 600mAh rating. If talk time is still noticeably short after five full cycles, check that the handset is fully seated in the base cradle — a poor contact means the charge current never completes the cycle. Measure resting voltage after a full overnight charge; a healthy cell should read 4.2–4.3V across the terminals.

Base station showing no charge or an error light on a new pack

NiMH batteries lose voltage during storage, and some Panasonic bases reject a pack that arrives below roughly 3.0V — the base interprets it as a faulty or missing cell. Remove the handset, leave it off the base for 60 seconds, then reseat it firmly. If the error light persists, the base needs to see a minimum voltage handshake; place the handset in the base, wait 10 minutes, then remove and reseat it — this often lets the charger circuit re-detect the rising voltage and begin a normal charge cycle.