Uniden SPS801 APX1105 Replacement Battery 7.2V 1800mAh

Uniden SPS801 Series — 7.2V Ni-MH Replacement Battery (APX1105)

This is a 7.2V, 1800mAh Ni-MH replacement battery for the Uniden SPS801 portable two-way radio. It also fits the SPS802, SPH155, and SPH155DT. Voltage and chemistry match OEM spec — the radio powers on and keys up normally without any firmware modification.

• SPS801 / SPH155 platform fit: These models share the same battery bay dimensions, contact orientation, and 7.2V voltage rail. The APX1105 pack slots into all listed variants without modification. No adapter or rewiring needed.
• Bench tested on actual hardware: We cycled this pack through full charge and PTT load pulls on the SPS801 platform. The BMS held stable under transmit current spikes and discharged cleanly to the low-voltage cutoff without tripping into lockout.
• First insertion into the dock: If the charger shows a fault LED on first insert, the pack contacts may not have seated cleanly. Remove the battery, wipe the contact strip with a dry cloth, and reseat firmly. The dock requires a clean contact cycle to register the pack and begin charging.

Why the SPS801 cuts out mid-transmission on a new APX1105 pack

Ni-MH cells ship at storage voltage — typically 1.1–1.2V per cell, which puts the 6-cell pack around 6.6–7.2V. Under the high current draw of a PTT transmit event, that voltage can sag below the radio's TX cutoff threshold before the pack has been fully conditioned. The radio interprets this as a depleted battery and drops the transmission. Running one or two full charge-discharge cycles brings the cells to full capacity and firms up the voltage floor under load.

Bar indicator shows one fewer bar than expected after fitting the APX1105

The SPS801 uses a voltage-threshold bar indicator — each bar corresponds to a resting voltage band. A new Ni-MH pack at storage voltage sits in a lower band, so the radio displays one fewer bar even though the pack is not depleted. This is not a fault with the pack or the radio. Charge the battery fully and allow it to rest for 15 minutes off the dock — resting voltage should read 8.4–8.6V and the indicator will reflect the correct level.