{"product_id":"hi-target-f61-replacement-battery-74v-5000mah-li-ion","title":"Hi-Target F61 GNSS Replacement Battery 7.4V 5000mAh BL-5000","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHi-Target F61 \/ F66 \/ H32 \/ V30 Series — 7.4V Li-ion Replacement Battery (BL-5000)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V 5000mAh Li-ion battery for the Hi-Target F61, F66, H32, and V30 GNSS receivers. It replaces OEM part BL-5000 and fits the same battery bay without modification. Capacity is 5000mAh (37Wh), matching the original specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eF61 \/ F66 \/ H32 \/ V30 platform fit:\u003c\/strong\u003e\n    These four receivers share the same battery bay dimensions, connector pinout, and BMS communication protocol — one battery pack services the full range. The 7.4V nominal rail matches the receiver's internal DC regulator input across all listed models.\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 and confirmed the BMS handshake with the receiver's battery management interface. The pack passed cell balancing checks and reported state-of-charge correctly on the receiver display.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-installation calibration cycle:\u003c\/strong\u003e\n    After fitting this battery, run a full calibration cycle through the receiver's system menu before field deployment. The F61 maps battery state during that sequence — skipping it causes premature low-battery warnings on the first measurement session, even with a full pack.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBMS lockout after the F61 sat unused in a carry case for months\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge over storage periods. If the pack voltage drops below approximately 2.5V per cell, the BMS enters a protective sleep state and blocks charge input — the receiver and charger both show no activity. To recover, apply a low-current pre-charge (around 0.1C) using a compatible charger that supports recovery mode, or use a bench charger set to 7.2V at 500mA until the pack responds. Once cell voltage climbs above the BMS wake threshold, normal charging resumes. Do not leave packs stored below 20% charge for extended periods.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGNSS receiver powers on but shuts down mid-session during active data logging\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage sag failure, not a capacity failure. Under sustained sensor and RF load — particularly when the receiver is logging RTK corrections and writing to internal storage simultaneously — current draw peaks and the battery voltage briefly dips below the BMS cutoff threshold. A new or partially degraded cell shows this more than a conditioned one. Charge the pack to full, run the calibration cycle, and check that the receiver firmware is current, as some versions have adjusted the low-voltage cutoff parameter. A healthy pack should hold above 7.0V under full operational load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360449331290,"sku":"BWCS-TRH320SL-1","price":66.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360449364058,"sku":"BWCS-TRH320SL-2","price":78.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360449396826,"sku":"BWCS-TRH320SL-3","price":87.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TRH320SL-1.webp?v=1778614760","url":"https:\/\/batteryweb.com\/products\/hi-target-f61-replacement-battery-74v-5000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}