EnGenius EP802H Cordless Phone Replacement Battery 3.7V 1200mAh

EnGenius EP802H — 3.7V Li-ion Replacement Battery

This 3.7V 1200mAh Li-ion battery replaces the original cell in the EnGenius EP802H DECT cordless handset. It fits the EP802H directly and restores handset operation when the original cell has faded. Capacity is rated at 4.44Wh.

• EP802H handset fit: The EP802H uses a slim 3.7V Li-ion cell with a fixed connector footprint. At 53.00 × 34.00 × 5.70mm, this cell matches that footprint so the battery door closes and the contacts seat correctly against the handset terminals.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the EP802H platform. The BMS held cutoff voltage correctly at both ends — no early shutdown on draw, no overcharge at the top of the charge curve.
• First charge on the EP802H: Place the handset in the base immediately after installing this battery and leave it for a full charge cycle before using the phone. Li-ion cells shipped at partial state of charge need one complete base-station charge to calibrate the handset's charge indicator accurately.

Talk time shorter than expected after fitting this battery

A new Li-ion cell stored before shipping arrives at a partial charge state, and the handset's fuel gauge has no reference point yet. The first one or two full charge-discharge cycles let the BMS learn the cell's actual top and bottom voltage limits. Until that happens, the handset may underestimate remaining capacity and cut off earlier than the rated 4.44Wh suggests. Run two complete cycles — full charge in base, use until the low-battery indicator appears — and talk time will stabilise.

Handset not pairing with base after battery swap

Removing the original battery cuts all power to the EP802H handset, and some DECT phones drop their base registration when power is fully interrupted. The handset and base need to re-establish the DECT link manually. Hold the handset's page or find button on the base for five seconds, then follow the pairing sequence in the EP802H manual — typically holding the handset's menu button within range of the base until the link LED confirms registration.