{"product_id":"relm-ma181-replacement-battery-108v-1200mah-ni-mh","title":"Relm MA181 Two-Way Radio Replacement Battery 10.8V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRelm MA181 \/ HH2500 Series — 10.8V Ni-MH Replacement Battery (MA181)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V, 1200mAh nickel-metal hydride battery for Relm portable two-way radios. It fits the MA181, BP4, MCD, and HH2500 platforms, among others. Swap it in when the original pack no longer holds a charge through a full shift.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHH2500 and MA181 platform fit:\u003c\/strong\u003e\n    These models share the same 10.8V three-cell NiMH rail and connector footprint. The BMS handshake across the platform accepts this pack without modification or adapter.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on the HH2500 platform. The BMS held voltage within spec under simulated PTT load spikes, and the charger dock accepted the pack on the first insertion without fault indication.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge contact check:\u003c\/strong\u003e\n    Before placing the pack in the dock for its first charge, wipe the gold contact strip with a dry cloth. Relm charger docks require clean contact across all pins to complete the BMS handshake — residue from storage packaging can trigger a fault LED on the first cycle.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the HH2500 cuts out mid-transmission on a new pack\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eNiMH cells ship at a reduced storage voltage — typically 1.0–1.1V per cell rather than the 1.2V nominal. On the HH2500, the transmit current spike when PTT is pressed can momentarily drag the pack voltage below the BMS cutoff threshold before the cells have been fully conditioned. The radio drops the transmission to protect the circuit. Running two full charge-discharge cycles before field use brings the cells to nominal voltage and eliminates this cutoff behaviour. Do not mistake this for a faulty pack — it is a new-cell voltage issue.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBar indicator showing one fewer bar than expected after install\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eRelm portables use a voltage-threshold bar indicator, not a fuel gauge chip. A new NiMH pack at storage voltage reads lower than a fully charged pack, so the radio displays one fewer bar than expected. This is not a capacity defect. Charge the pack fully in the dock until the charger LED goes solid green, then power on the radio — the bar indicator will reflect the correct charge state. Expect the display to show full bars at or above 12.6V across the pack.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426320973914,"sku":"BWCS-UPX500TW-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426321006682,"sku":"BWCS-UPX500TW-2","price":50.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426321039450,"sku":"BWCS-UPX500TW-3","price":55.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-UPX500TW-1.webp?v=1779930681","url":"https:\/\/batteryweb.com\/products\/relm-ma181-replacement-battery-108v-1200mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}