{"product_id":"motorola-clarigo-smp-508-replacement-battery-74v-1200mah-li-ion","title":"Motorola Clarigo SMP-508 7.4V Replacement Battery 60Q137301-C","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMotorola Clarigo SMP-508 \/ SMP-528 — 7.4V Li-ion Replacement Battery (60Q137301-C)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V 1200mAh Li-ion battery replaces the OEM 60Q137301-C pack in the Motorola Clarigo SMP-508 and SMP-528 two-way radios. It matches the original voltage rail and connector, so it seats and communicates with the radio's BMS without modification. Dimensions are 94.50 × 54.60 × 14.10mm — same footprint as the factory pack.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSMP-508 and SMP-528 compatibility:\u003c\/strong\u003e\n    Both models run the same 7.4V rail, share the same connector pinout, and use an identical BMS handshake sequence. One pack covers both units on your fleet.\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 transmit-load discharge on the SMP-508 platform. The BMS held cutoff cleanly at low voltage and accepted charge without fault on a standard Motorola dock.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst insertion into the dock:\u003c\/strong\u003e\n    If the dock LED shows a fault on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat it firmly. The SMP-series dock requires a clean contact cycle to initiate the BMS handshake before it begins charging.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SMP-508 cuts out mid-transmission on a fresh 60Q137301-C pack\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003ePressing PTT drives a sharp current spike — the SMP-508 draws significantly more current during transmit than in standby. If the replacement pack ships at storage voltage (typically around 3.7–3.8V per cell), the BMS can interpret that spike as an overcurrent event and trip the protection circuit. This interrupts the transmission instantly, even though the battery is not defective. Fully charge the pack before first use — let the dock reach green — then the cells will be at full voltage and the BMS will handle the transmit spike without tripping.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBar indicator showing one fewer bar than expected on a new pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe SMP-508 and SMP-528 use a voltage-threshold bar indicator, not a fuel gauge chip. When a new pack arrives at storage voltage rather than full charge, the radio reads a lower voltage and displays fewer bars than the battery's true capacity warrants. This is not a fault with the cell — it is the radio responding accurately to the current resting voltage. Charge the pack fully on the dock until the LED goes green, then reinsert it and the bar display will reflect full charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426315370586,"sku":"BWCS-MTP528TW-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426315403354,"sku":"BWCS-MTP528TW-2","price":38.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426315436122,"sku":"BWCS-MTP528TW-3","price":42.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MTP528TW-1.webp?v=1779930680","url":"https:\/\/batteryweb.com\/products\/motorola-clarigo-smp-508-replacement-battery-74v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}