{"product_id":"chcnav-i50-replacement-battery-74v-3400mah-li-ion","title":"Chcnav XB-2 GNSS Receiver Replacement Battery 7.4V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eChcnav i50 \/ M3 \/ M6 \/ T3 Series — 7.4V Li-ion Replacement Battery (XB-2)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 3400mAh Li-ion replacement for the Chcnav XB-2 battery pack. It fits the i50 GNSS receiver along with the M3, M6, and T3 models that share the same power architecture. Capacity is 25.16Wh — matched to the original spec.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ei50, M3, M6, T3 shared platform:\u003c\/strong\u003e\n    These four Chcnav models run the same 7.4V battery rail, use the same physical form factor, and share BMS handshake logic — so one pack covers the full group without any firmware or connector mismatch.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through multi-constellation tracking loads on the i50 platform. The BMS held voltage within spec across satellite lock, active data logging, and Bluetooth transmission simultaneously.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eField calibration before first deployment:\u003c\/strong\u003e\n    After fitting a new pack, run a full calibration cycle through the i50's instrument menu before heading into the field. The receiver maps battery state during this cycle — skip it and the low-battery warning triggers early on the first real session.\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 i50 sat unused in a carry case for months\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eWhen a Li-ion pack self-discharges below roughly 2.5V per cell, the BMS enters a protection state and blocks normal charge input. The i50's charge circuit won't wake a pack in this state using standard charging alone. To recover it, apply a trickle charge at a low current — many quality chargers have a recovery or \"wake\" mode for this. Once the pack climbs above 3.0V per cell, the BMS releases and normal charging resumes.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ei50 shuts down mid-session despite showing adequate charge on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when sustained sensor and radio load pulls the pack voltage below the BMS cutoff threshold — even if the display indicator was reading mid-range. The i50 draws harder during simultaneous GNSS tracking, internal logging, and active radio link, and an aged or cold pack can't hold voltage under that combined load. A new pack at full capacity handles this draw without voltage sag triggering the cutoff. Confirm the pack is fully charged — above 8.3V open circuit — before starting a long field session.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360752435290,"sku":"BWCS-LI1HL-1","price":36.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360752468058,"sku":"BWCS-LI1HL-2","price":42.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360752500826,"sku":"BWCS-LI1HL-3","price":46.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LI1HL-1.webp?v=1778616259","url":"https:\/\/batteryweb.com\/products\/chcnav-i50-replacement-battery-74v-3400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}