{"product_id":"regency-relm-rpu416-replacement-battery-74v-1800mah-li-ion","title":"Regency-Relm RPU416 BPRP1100 7.4V Replacement Battery","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRegency-Relm RPU416 \/ RPU499 Series — 7.4V Li-ion Replacement Battery (BPRP1100)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 1800mAh lithium-ion battery for the Regency-Relm RPU416, RPU499, RPU516, and RPV416 portable two-way radios. It replaces OEM part numbers BPRP1100, BPRP1500, and BPRP1500MH. Capacity is sourced from the cell spec sheet, not estimated.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRPU416 \/ RPU499 \/ RPU516 \/ RPV416 platform fit:\u003c\/strong\u003e\n    These radios share the same battery bay geometry, contact rail spacing, and 7.4V BMS handshake threshold. One pack covers the full group without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through full charge and discharge on the RPU416 platform. The BMS negotiated the handshake on first insertion and held voltage within the radio's accepted operating band through the full discharge curve.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-insertion contact check:\u003c\/strong\u003e\n    If the charger dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The Regency-Relm dock requires a clean contact cycle to accept 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 RPU416 cuts out mid-transmission on a new BPRP1100\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eWhen PTT is pressed, transmit current spikes well above the radio's standby draw. A new pack shipped at storage voltage — typically around 3.7V per cell — sits close to the BMS overcurrent trip threshold under that sudden load. The BMS reads the surge as a fault condition and briefly disconnects the output rail, which kills the transmission. One full charge cycle brings both cells to 4.2V, raising the voltage headroom enough that the BMS no longer trips on the TX spike.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBar indicator showing one fewer bar than expected after fitting new pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe RPU416 uses a simple voltage-threshold bar indicator — each bar corresponds to a specific voltage window, not a percentage from a fuel gauge chip. A new cell delivered at storage voltage reads one or two bars low even though the pack is not depleted. This is not a fault with the cell. Charge the pack fully to 8.4V on the dock, then power the radio on — the bar indicator will reflect the correct charge state.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426331459674,"sku":"BWCS-KNB150TW-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426331492442,"sku":"BWCS-KNB150TW-2","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426331525210,"sku":"BWCS-KNB150TW-3","price":50.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-KNB150TW_1.webp?v=1779930721","url":"https:\/\/batteryweb.com\/products\/regency-relm-rpu416-replacement-battery-74v-1800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}