{"product_id":"testo-175-h1-replacement-battery-36v-1200mah-li-socl2","title":"Testo 175-H1 Data Logger Compatible Battery 3.6V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTesto 175-H1 \/ 175-H2 \/ 175-S1 \/ 175-S2 — 3.6V Li-SOCl2 Replacement Battery (175-SL750)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V 1200mAh lithium thionyl chloride cell for Testo 175-series data loggers. It fits the 175-H1, 175-H2, 175-S1, and 175-S2 instruments used in HVAC surveys, refrigeration monitoring, and building audits. Li-SOCl2 chemistry is standard for this application — it holds voltage flat across long unattended logging sessions where alkaline cells would sag and distort the low-battery threshold.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e175-series platform fit:\u003c\/strong\u003e\n    The H1, H2, S1, and S2 share the same battery bay dimensions, connector orientation, and voltage rail. The logger's firmware reads cell voltage directly — it does not use a fuel gauge IC — so chemistry and nominal voltage must match the original cell exactly to avoid false low-battery shutdowns.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell under continuous sensor polling load typical of the 175-series and confirmed the BMS did not trip on probe initialisation. Voltage held within 3% of nominal through the first 48-hour logging cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-installation calibration step:\u003c\/strong\u003e\n    After fitting this cell, run a full calibration cycle through the instrument menu before deploying the logger in the field. The 175-series maps battery state during calibration — skipping this step causes premature low-battery warnings to appear during the first active measurement session, even with a full cell installed.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the 175-series logger cuts out when the probe initialises\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAt power-up, the 175-H1 and 175-S1 send a short current burst to the probe or sensor module to initialise it. A cell with any internal resistance increase — from age, deep discharge, or long storage — sees its terminal voltage dip sharply during that burst. If the dip crosses the logger's undervoltage threshold, the instrument interprets it as a depleted cell and shuts down immediately. A fresh Li-SOCl2 cell has low enough internal resistance to absorb that spike without the voltage dropping below cutoff. If the logger still cuts out on probe init after fitting a new cell, check that the probe connector is fully seated — a partial connection increases load impedance and worsens the spike.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLogger display shows erratic battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe 175-series estimates remaining capacity by tracking voltage against a fixed discharge curve — there is no coulomb counter recalibrating in the background. When a new cell is installed, the firmware compares the resting voltage to its stored curve and may place the indicator at a point that does not reflect actual capacity for the first few readings. This typically resolves after one full logging session brings the cell to a stable discharge state. If the percentage reading still jumps between sessions, run a calibration cycle from the instrument menu — the logger resets its voltage-to-capacity mapping at 3.6V nominal during that routine.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360560644186,"sku":"BWCS-TES175SL-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360560676954,"sku":"BWCS-TES175SL-2","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360560709722,"sku":"BWCS-TES175SL-3","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TES175SL-1.webp?v=1778616005","url":"https:\/\/batteryweb.com\/products\/testo-175-h1-replacement-battery-36v-1200mah-li-socl2","provider":"BatteryWeb","version":"1.0","type":"link"}