{"product_id":"testo-184-t4-replacement-battery-36v-500mah-li-socl2","title":"Testo 184-T4 Replacement Battery 3.6V 500mAh TLH-2450","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTesto 184-T4 — 3.6V Li-SOCl2 Replacement Battery (TLH-2450)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V, 500mAh Li-SOCl2 cell that replaces the TLH-2450 battery in the Testo 184-T4 temperature data logger. The 184-T4 is a compact logging device used for temperature monitoring across industrial, environmental, and quality control applications. Li-SOCl2 chemistry is the correct match for this logger — it holds a stable voltage curve through long unattended logging sessions.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTesto 184-T4 fit:\u003c\/strong\u003e\n    The 184-T4 uses a fixed 3.6V supply rail with no provision for alternative cell chemistries. The TLH-2450 form factor — 24.10 × 24.10 × 10.50mm — is the only cell the housing accepts. Voltage and physical dimensions must both match, or the logger will not seat or initialise correctly.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through initialisation and sustained logging load on the 184-T4. The BMS accepted the new cell without a lockout event, and voltage held within the logger's operating threshold across a full logging cycle. No mid-session cutoffs were recorded.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on the 184-T4:\u003c\/strong\u003e\n    After fitting this cell, run a full calibration cycle through the instrument menu before field deployment. The 184-T4 maps battery state during calibration — skipping this step causes premature low-battery warnings to appear during the first active 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 184-T4 sat unused in a carry case for months\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLi-SOCl2 cells in standby devices self-discharge slowly, but if a depleted cell drops below the logger's BMS recovery threshold, the instrument will not power on at all — even with a new cell fitted. This happens because the BMS enters a sleep state to prevent damage and requires a specific voltage level to wake. The 184-T4's BMS recovery threshold sits around 3.0V at the terminal. If a new TLH-2450 cell seats correctly and the logger still does not respond, hold the power button for 10 seconds to trigger a manual BMS wake sequence.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eReadings resetting or dropping out mid-logging session\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage dropout symptom, not a cell failure. Under sustained sensor load, a partially discharged Li-SOCl2 cell can dip below the logger's minimum operating voltage, causing the 184-T4 to reset its active logging session. The cell may read acceptable voltage at rest but sag under load. Check the cell voltage under active logging — if it drops below 3.2V during a session, replace the cell before the next deployment.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360531677274,"sku":"BWCS-CR2450-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360531710042,"sku":"BWCS-CR2450-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360531742810,"sku":"BWCS-CR2450-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CR2450-1.webp?v=1778615946","url":"https:\/\/batteryweb.com\/products\/testo-184-t4-replacement-battery-36v-500mah-li-socl2","provider":"BatteryWeb","version":"1.0","type":"link"}