{"product_id":"tosight-tsel-110-replacement-battery-72v-1200mah-li-ion","title":"Tosight TSEL-110 Replacement Battery 7.2V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTosight TSEL-110 \/ TSEL-2000 — 7.2V Li-ion Replacement Battery (NL374964H-2S)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.2V, 1200mAh Li-ion pack replaces the OEM NL374964H-2S battery in Tosight TSEL-110 and TSEL-2000 survey and measurement instruments. It matches the original voltage rail and physical form factor exactly. Capacity is 1200mAh (8.64Wh), matching the stock specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTSEL-110 and TSEL-2000 compatibility:\u003c\/strong\u003e\n    Both models run the same 7.2V bus, share the NL374964H-2S form factor, and use identical BMS handshake protocols — so one pack covers both instruments 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 probe initialisation sequences, which pull a short current spike at power-up. The BMS held the load without tripping, and the instrument accepted the pack without error flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration step:\u003c\/strong\u003e\n    After fitting this pack, run a full calibration cycle through the instrument menu before heading to the field. The TSEL maps battery state during calibration — skip it and the instrument will throw premature low-battery warnings on your first measurement 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 TSEL-110 sat unused in a carry case for months\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If the pack drops below approximately 2.5V per cell, the BMS enters a protective lockout state and the instrument will not recognise it at all. Placing a locked-out pack on the charger often does nothing because the charger handshake also fails below that threshold. To recover, apply a compatible charger that supports a slow pre-charge or trickle mode — this brings cell voltage back above the BMS wake-up floor, typically around 2.9V per cell, at which point normal charging resumes.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eInstrument shuts down mid-measurement despite showing adequate charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when sustained sensor load pulls the pack voltage below the instrument's cutoff threshold — not because the pack is empty, but because internal resistance causes a momentary voltage sag under load. An ageing OEM cell exaggerates this sag even at 50% state of charge. A fresh pack with lower internal resistance holds the voltage rail steady through the same load. If the new pack still triggers shutdowns, check that you ran the post-install calibration cycle — the instrument needs to map the new cell's voltage curve before it can track state of charge accurately.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360613171290,"sku":"BWCS-TSL110SL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360613204058,"sku":"BWCS-TSL110SL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360613236826,"sku":"BWCS-TSL110SL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TSL110SL-1.webp?v=1778616135","url":"https:\/\/batteryweb.com\/products\/tosight-tsel-110-replacement-battery-72v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}