{"product_id":"topcon-field-controller-fc100-replacement-battery-74v-2200mah-li-ion","title":"Topcon FC100 BT-30 Replacement Battery 7.4V 2200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTopcon FC100 \/ FC2000 Field Controller — 7.4V Li-ion Replacement Battery (BT-30)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 2200mAh Li-ion pack replaces the OEM BT-30 battery in the Topcon FC100 and FC2000 Field Controllers. These are handheld data collection units used in surveying, construction layout, and GPS field work. It also cross-references OEM part numbers BT-62Q, BT-65Q, and BT-66Q for extended model coverage.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFC100 and FC2000 platform fit:\u003c\/strong\u003e\n    Both controllers run the same 7.4V battery rail and share a common connector footprint and BMS handshake protocol. One pack covers both units without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through the FC100's power-on sequence and GPS initialisation load. The BMS held stable under the combined draw of the display backlight, GPS module, and data logging — no false cutoff events recorded.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePre-deployment calibration cycle:\u003c\/strong\u003e\n    After installing this pack, run a full calibration cycle through the FC100's instrument menu before heading into the field. The controller maps battery state during that sequence, and skipping it causes premature low-battery warnings to appear before actual capacity is depleted.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFC100 BMS lockout after the pack sat unused in a carry case for months\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells left dormant below roughly 2.5V per cell will cause the BMS to enter a protective sleep state. In this condition the FC100 shows no charge indicator and may not respond to the charger at all. The fix is to apply a low-current trickle charge — most OEM Topcon chargers will attempt a recovery cycle automatically if left connected for 15 to 30 minutes. Once cell voltage recovers above the BMS wake threshold (approximately 6.0V across the pack), normal charging resumes.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS readings reset or logging session drops mid-session with no low-battery warning\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when sustained GPS and sensor load pulls the pack voltage below the FC100's brownout threshold momentarily — not a full discharge, just a voltage sag under load. The controller interprets the sag as a fault and resets the active session. A new cell pack with low internal resistance holds voltage more consistently under that combined draw. After fitting the replacement, confirm resting voltage reads at or above 8.2V before starting a logging session.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360789200986,"sku":"BWCS-TOP100SL-1","price":34.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360789233754,"sku":"BWCS-TOP100SL-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360789266522,"sku":"BWCS-TOP100SL-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TOP100SL-1.webp?v=1778616277","url":"https:\/\/batteryweb.com\/products\/topcon-field-controller-fc100-replacement-battery-74v-2200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}