{"product_id":"relm-rpu7500-replacement-battery-74v-1600mah-li-ion","title":"Relm RPU7500 Replacement Battery BL1703 7.4V 1600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRelm RPU7500 \/ RPV7500 — 7.4V Li-ion Replacement Battery (BL1703)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 1600mAh Li-ion replacement for the Relm BL1703 battery pack. It fits the RPU7500 and RPV7500 portable transceivers used in public safety, security, and commercial communications. Voltage and capacity match the OEM spec exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRPU7500 and RPV7500 platform fit:\u003c\/strong\u003e\n    Both radios share the same battery bay dimensions, contact arrangement, and BMS handshake protocol — one pack covers both. The 7.4V nominal rail matches the TX power stage on each unit without triggering undervoltage shutdown on key-up.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through repeated PTT key-up events to confirm the BMS handles the transmit current spike without tripping into protection mode. Voltage held stable across the RF output stage throughout each test.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst insertion into the charger dock:\u003c\/strong\u003e\n    If the dock LED flashes a fault pattern on initial seating, remove the pack and wipe the gold contact strip with a dry cloth before reseating. The RPU7500 dock requires a clean contact cycle to complete the BMS handshake and begin the charge sequence.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the RPU7500 cuts out mid-transmission on a new BL1703\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eNew Li-ion cells ship at storage voltage — typically around 3.6–3.7V per cell, not full charge. When you key up at that voltage, the transmit current draw pulls the pack voltage below the BMS protection threshold momentarily, and the radio drops the TX stage. This is not a faulty pack. Fully charge the battery before first use and the cutout stops.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBar indicator showing one fewer bar than expected after full charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe RPU7500 uses a simple voltage-threshold bar indicator — it reads pack voltage and maps it to a bar count. A new cell's internal impedance is slightly higher before its first few cycles, which causes a small voltage drop under load and shifts the reading down by one bar. This is not a calibration fault. Run two or three full charge and discharge cycles and the bar reading aligns with actual capacity.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426349252698,"sku":"BWCS-HTC700TW-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426349285466,"sku":"BWCS-HTC700TW-2","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426349318234,"sku":"BWCS-HTC700TW-3","price":51.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HTC700TW-1.webp?v=1779930720","url":"https:\/\/batteryweb.com\/products\/relm-rpu7500-replacement-battery-74v-1600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}