DNT Apollo 4.8V Cordless Phone Replacement Battery 1800mAh

DNT Apollo Cordless Phone — 4.8V Ni-MH 1800mAh Replacement Battery

This is a 4.8V Ni-MH battery rated at 1800mAh, built to replace the original pack in the DNT Apollo cordless handset. It fits directly into the Apollo handset battery compartment and restores normal talk and standby operation. No OEM part number is listed for this model — match by handset model before ordering.

• Apollo handset compatibility: The DNT Apollo runs a 4.8V Ni-MH cell arrangement tied to the handset's charging circuit. Swapping in any pack outside this voltage range causes the base station to reject the charge cycle or report a fault — this replacement sits at the correct voltage for the Apollo's charging controller.
• Bench tested on actual hardware: We cycled this pack through charge and discharge runs on the bench. The cell voltage stabilised after three full cycles and the BMS held within the Apollo's acceptance window throughout.
• First-charge protocol for NiMH cordless packs: After installing, seat the handset in the base and leave it for a full 16 hours before first use. Ni-MH packs shipped in partial-discharge states need this slow initial charge to reach rated capacity — skipping it means the cells never fully condition and talk time stays short from day one.

Base station showing no charge light after fitting the new pack

Ni-MH packs lose voltage during storage — sometimes dropping low enough that the Apollo base station's charging circuit won't initiate. The base expects to see a cell voltage above its acceptance threshold before it starts the charge cycle. If the handset sits in the base with no charge indicator, remove it, wait 30 seconds, and reseat it firmly. If the base still shows no activity after two reseating attempts, check the contacts on both the handset and cradle — oxidation on the charge pins breaks the circuit and mimics a dead battery.

Range dropping mid-call after a battery swap

DECT handsets pull a sharp current spike when the RF transmitter fires — this is the highest-draw moment in normal cordless phone operation. A new Ni-MH pack that hasn't completed conditioning cycles can't sustain voltage under that load, so the transmitter power sags and range collapses. This clears up after three to five full charge-discharge cycles as the cells reach rated capacity. Run the handset until the low-battery tone sounds, return it to the base for a full charge, and repeat — range should stabilise by cycle four.