{"product_id":"motorola-mag-one-bpr40-replacement-battery-75v-1100mah-ni-mh","title":"Motorola BPR40 Replacement Battery 7.5V 1100mAh PMNN4071","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMotorola Mag One BPR40 \/ A8 \/ A6 — 7.5V Ni-MH Replacement Battery (PMNN4071)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.5V, 1100mAh Ni-MH replacement battery for the Motorola Mag One BPR40, A8, and A6 two-way radios. It replaces OEM part numbers PMNN4071, PMNN4071A, PMNN4071AR, and PMNN4071AC. Slide it into the same battery bay, lock the latch, and the radio powers on.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBPR40, A8, and A6 platform fit:\u003c\/strong\u003e\n    These three models share the same battery bay dimensions, latch geometry, and contact layout. The BMS in this pack is tuned to the same voltage rail — 7.5V nominal — so the radio's protection circuit treats it the same as the original pack.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through full charge and discharge cycles on a BPR40 dock. The BMS held stable under the transmit current spike when PTT was pressed repeatedly, and the charger advanced to trickle without fault.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eContact strip prep on first insertion:\u003c\/strong\u003e\n    If the dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The BPR40 dock requires a clean contact cycle to complete the BMS handshake before charging begins.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the BPR40 bar indicator reads low on a freshly inserted new pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells ship at storage voltage — typically 1.1–1.2V per cell — which sits below the radio's top bar threshold. The BPR40 reads voltage directly to set the bar count, so a new pack at storage voltage will show one or two bars even though the cells are not depleted. Run a full charge cycle in the dock before reading the indicator. After a complete charge, the voltage rises to approximately 8.4–8.6V and the indicator reflects the actual state of the pack.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eRadio cuts out mid-transmission after PTT is held for several seconds\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSustained RF output draws significantly more current than standby — the BPR40's transmitter pulls a sharp current spike every time PTT is pressed, and a degraded or partially charged pack can sag below the radio's undervoltage cutoff under that load. This triggers an abrupt shutdown mid-transmission, not a gradual fade. The fix is a full charge cycle before the shift; if the cutout persists on a fully charged pack, measure the resting voltage with a multimeter — a healthy pack holds above 7.8V at rest. A pack reading below 7.4V at rest after a full charge has a cell with elevated internal impedance and needs replacing.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426340372570,"sku":"BWCS-MPR400TW-1","price":36.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426340405338,"sku":"BWCS-MPR400TW-2","price":42.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426340438106,"sku":"BWCS-MPR400TW-3","price":46.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MPR400TW-1.webp?v=1779930784","url":"https:\/\/batteryweb.com\/products\/motorola-mag-one-bpr40-replacement-battery-75v-1100mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}