ADT Wireless Color Touchscreen Keypad Replacement Battery 4.8V 2000mAh

ADT Wireless Color Touchscreen Keypad — 4.8V Ni-MH Replacement Battery

This 4.8V 2000mAh (9.6Wh) Ni-MH battery replaces the internal rechargeable cell in the ADT Wireless Color Touchscreen Keypad. The keypad runs on ADT home security systems and uses this battery to maintain operation during mains outages. Voltage and chemistry must match exactly — swapping to Li-ion or a different voltage will cause charge circuit faults.

• ADT Wireless Color Touchscreen Keypad fit: This keypad uses a dedicated 4.8V Ni-MH pack to match the onboard charge management circuit. The BMS expects a slow trickle charge profile specific to Ni-MH chemistry — a mismatched chemistry trips the fault register and the panel reports a permanent battery error.
• Bench tested on actual hardware: We cycled this cell through discharge and float charge sequences on the keypad charge circuit. The BMS accepted the pack without fault codes and the float charge voltage stabilised at the expected level within 24 hours.
• Post-install charge window: Do not run a zone or siren test immediately after fitting this battery. The panel requires 24–48 hours on float charge before its BMS reports a full battery status — triggering a diagnostic test before that window closes will produce a false low-battery alert on the keypad display.

Alarm panel losing programming during a power outage after battery swap

A freshly installed Ni-MH cell does not hold enough surface charge to sustain the panel through a mains outage until it has completed at least one full conditioning cycle. The charge circuit tops up the cell gradually — if the power drops in the first 12 hours after installation, the keypad may lose zone programming or revert to factory defaults. Allow 48 hours of uninterrupted mains power after fitting the new battery before treating it as conditioned backup. After that window, the cell should hold steady above 4.6V under load during an outage.

Keypad touchscreen goes blank mid-session even on a new battery

This happens when the replacement cell has a high internal resistance from storage — common in Ni-MH packs that have sat uncharged for several months. The touchscreen draws a brief current spike on wake, and a high-resistance cell sags below the keypad's undervoltage threshold, triggering an immediate shutdown. The fix is to leave the keypad on mains charge for a full 48-hour conditioning cycle before use. After conditioning, measure the pack voltage under load — it should sit above 4.5V. If it sags below that, the cell has not recovered and should be replaced.