{"product_id":"tsc1-replacement-battery-74v-3400mah-li-ion","title":"TSC1 29518 Li-ion Replacement Battery 7.4V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTSC1 29518 \/ 38403 \/ 46607 — 7.4V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V 3400mAh Li-ion pack replaces the original battery in TSC1 survey and field data collection instruments. It covers OEM part numbers 29518, 38403, 46607, 52030, C8872A, and EI-D-LI1. Slot it into your TSC1 unit, complete an instrument calibration cycle, and get back to site work.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMulti-OEM part number coverage:\u003c\/strong\u003e\n    TSC1 issued several part numbers across firmware and hardware revisions — 29518, 38403, 46607, 52030, C8872A, and EI-D-LI1 — but the physical pack, connector pinout, and BMS handshake stayed consistent across all of them. One replacement covers the full range.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through probe initialisation cycles and sustained sensor-load draws. The BMS held stable at rated voltage under continuous logging loads and did not trip on the current spike that occurs when external probes power up.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCalibration cycle before first field deployment:\u003c\/strong\u003e\n    After installing this pack, run a full calibration sequence through the instrument menu before heading to site. The TSC1 maps battery state during that cycle — skip it and the instrument will flag premature low-battery warnings during your first measurement session, even with a full charge.\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 a TSC1 pack sits unused in a carry case for months\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge at roughly 1–3% per month. If a TSC1 instrument sits in a case for an extended period, the pack can drop below 2.5V per cell — the threshold where most BMS circuits hard-lock to prevent cell damage. At that point the instrument will not power on and the charger may show no activity. Connect the charger and leave it for at least 60–90 minutes before attempting to power on; most BMS circuits include a trickle-recovery mode that will slowly bring the cell voltage back above the re-initialisation threshold of approximately 3.0V per cell. If the charger still shows no response after two hours, the cells have likely gone below recoverable voltage.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTSC1 resetting or losing logged data mid-session under sustained sensor load\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSustained sensor operation draws more current than idle or GPS-only modes, and a degraded or partially discharged cell can sag below the instrument's minimum voltage rail before the fuel gauge registers low. The result is an unexpected reset or data loss with the display still showing a partial charge. This is a voltage-sag failure, not a capacity failure — the cell can't maintain voltage under load even if it holds charge at rest. Check the pack's resting voltage with a multimeter after a full charge; it should read 8.3–8.4V. Anything below 8.0V at rest signals a cell that will sag under load and should be replaced.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360757612634,"sku":"BWCS-LI1HL-1","price":36.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360757645402,"sku":"BWCS-LI1HL-2","price":42.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360757678170,"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\/tsc1-replacement-battery-74v-3400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}