Maas AHT-7 Compatible Battery 3.7V 1050mAh Li-ion

Maas AHT-7 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1050mAh Li-ion battery for the Maas AHT-7 two-way radio. It replaces the original pack when the radio no longer holds charge or powers down unexpectedly during use. Dimensions are 53.20 × 35.30 × 7.10mm — confirm these against your existing pack before ordering.

• AHT-7 platform fit: The AHT-7 runs a single-cell 3.7V architecture with a compact form factor. This pack matches the voltage rail, cell footprint, and connector orientation the radio expects. No adapter or modification needed.
• Bench tested on actual hardware: We cycled this pack through transmit loads and monitored BMS response under PTT current spikes. The protection circuit handled the draw without tripping into lockout.
• First insertion on the AHT-7 charger dock: If the dock shows a fault indicator on first insertion, remove the battery and wipe the contact points with a dry cloth. Reseat firmly. The dock requires a clean contact cycle to recognise the new BMS before charging begins.

Why the AHT-7 cuts out mid-transmission on a new battery

Pressing PTT pulls a sharp current spike that exceeds normal standby draw by several times. If the new pack arrived at storage voltage — typically around 3.6V — the BMS may interpret that spike as an overcurrent event and trip the protection circuit. The radio goes silent, then recovers seconds later. One full charge cycle brings the cell to 4.2V and gives the BMS enough headroom to handle transmit loads without cutting out.

Bar indicator showing one fewer bar than expected after fitting this pack

The AHT-7 uses a voltage-threshold bar indicator — it reads cell voltage and maps it to bars on screen. A new cell shipped at storage voltage reads lower than a fully charged one, so the radio displays one or two bars even though the pack is not depleted. This is not a fault. Charge the battery fully to 4.2V and the indicator will step up to full bars on the next power cycle.