{"product_id":"relm-rpu7500-replacement-battery-74v-3350mah-li-ion","title":"Relm RPU7500 Replacement Battery BL1703 7.4V 3350mAh","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 7.4V 3350mAh Li-ion battery replaces the BL1703 pack on the Relm RPU7500 and RPV7500 handheld transceivers. Both radios share the same battery bay geometry, contact layout, and BMS handshake protocol, so one part number covers both models. Capacity is rated at 24.79Wh.\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 models run the same 7.4V nominal voltage rail, use the same multi-pin connector footprint, and expect the same BMS communication signal from the pack. One replacement covers both without any modification.\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 full transmit-load discharge on the RPU7500 chassis. The BMS held voltage under sustained PTT draw and tripped correctly at the low-voltage cutoff threshold — no premature shutoff and no overcurrent fault flagged.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-insertion contact cycle on the RPU7500 dock:\u003c\/strong\u003e\n    If the charger dock shows a fault LED on the first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The RPU7500 charging dock requires a clean contact seating before it accepts the new BMS handshake and begins the charge 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 RPU7500 cuts out mid-transmission on a new BL1703\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA new Li-ion pack ships at storage voltage — typically 3.6V to 3.7V per cell, not full charge. When you key up and transmit, the RPU7500 draws a sharp current spike that the BMS reads as a low-voltage condition and responds with an immediate cutoff. This is not a faulty battery. Charge the pack fully before the first transmit cycle and the cutoff will not recur. A fully charged BL1703 sits at 8.4V across both cells before any load is applied.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBar indicator showing one fewer bar than expected after inserting the BL1703\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe RPU7500 uses a voltage-threshold bar indicator — each bar maps to a specific resting voltage band. A new pack at storage voltage reads in the lower threshold band and displays one or two bars even though the cell capacity is intact. This is not a capacity defect. Charge the battery fully, let it rest off the charger for five minutes, then reinsert — the indicator will read the correct resting voltage of approximately 8.2–8.4V and display full bars.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426231386202,"sku":"BWCS-HTC78TC-1","price":64.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426231418970,"sku":"BWCS-HTC78TC-2","price":76.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426231451738,"sku":"BWCS-HTC78TC-3","price":85.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HTC78TC-1.webp?v=1779930493","url":"https:\/\/batteryweb.com\/products\/relm-rpu7500-replacement-battery-74v-3350mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}