Honeywell PROWLTOUCH 3.7V Compatible Battery 300-10728

Honeywell PROWLTOUCH Series — 3.7V Li-Polymer Replacement Battery (300-10728)

This is a 3.7V 580mAh Li-Polymer battery for the Honeywell Home PROWLTOUCH wireless security keypad. It fits the PROWLTOUCH, PROWLTOUCHC, and the ProSeries 7" Color Wireless Touchscreen. Swap it in when the original cell no longer holds charge and the panel starts reporting a low battery fault.

• PROWLTOUCH and PROWLTOUCHC compatibility: These models share the same 3.7V power rail, connector pinout, and BMS handshake, which is why a single cell covers the whole range. The panel communicates battery state to the base station over the same RF link used for zone signals — a mismatched cell voltage trips that reporting logic immediately.
• Bench tested on actual hardware: We cycled this cell on a PROWLTOUCH panel and confirmed the BMS accepted the new battery without a fault code. Charge acceptance was clean from the first cycle, and the panel cleared its low-battery event after the float charge phase completed.
• Post-install commissioning tip: Do not run a zone diagnostic immediately after fitting this cell. The panel BMS requires 24–48 hours on float charge before it can accurately report battery state. Running a test too early will trigger a false low-battery alert even with a fully functional new cell.

Why the PROWLTOUCH reports low battery hours after a new cell is fitted

The PROWLTOUCH panel does not read cell voltage directly — it interprets charge state through the BMS conditioning cycle. A freshly installed cell starts that cycle from scratch, and the panel flags low battery until the cycle completes. This is not a fault with the replacement cell. It clears on its own once the panel has held float charge for 24–48 hours. No reset is needed; the low-battery event drops from the event log automatically.

Panel loses zone programming after a power cut with the new battery installed

If the panel drops its zone programming during a mains outage shortly after a battery swap, the new cell had not yet been fully accepted into the backup circuit. The BMS must complete an initial conditioning cycle before the cell is treated as a valid backup source — this takes up to 48 hours on continuous mains power. During that window, a power cut leaves the panel without backup support and it resets to defaults. Restore mains power, allow the full 48-hour conditioning period, then re-enter your zone configuration.