{"product_id":"rayovac-rv-dc8100-replacement-battery-74v-3400mah-li-ion","title":"Rayovac RV-DC8100 7.4V 3400mAh Li-ion Replacement Battery","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRayovac RV-DC8100 — 7.4V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 3400mAh Li-ion battery replaces the original pack in the Rayovac RV-DC8100 handheld survey and measurement instrument. It targets field technicians, surveyors, and engineers who need a direct cell replacement without retiring the instrument. Capacity is 25.16Wh, matching the original energy envelope the instrument expects.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRV-DC8100 platform fit:\u003c\/strong\u003e\n    The RV-DC8100 uses a 7.4V two-cell Li-ion configuration with a BMS that handshakes on voltage signature at power-on. This pack runs the same cell arrangement and presents the correct resting voltage so the instrument's power management accepts it without throwing a battery error.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack under a sustained sensor-logging load profile and confirmed the BMS held the output rail steady through repeated probe initialisation events. Voltage sag on cold-start stayed within the instrument's accepted threshold window.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eInstrument calibration before first field use:\u003c\/strong\u003e\n    After installing this pack, run a full calibration cycle through the instrument's menu before taking it into the field. The RV-DC8100 maps battery state during calibration — skipping this step causes the instrument to throw premature low-battery warnings on the first measurement session, even with a fully charged pack.\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 RV-DC8100 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 RV-DC8100 sat unused long enough, the pack voltage can drop below the BMS recovery threshold — typically around 2.5V per cell, or 5.0V at the pack level. At that point the BMS latches into a protection state and blocks normal charging. A standard charger will see the pack as defective and refuse to push current. The fix is a short trickle pre-charge — apply a low-current source (around 0.1C) to bring cell voltage above 3.0V per cell, then transfer to a normal charger.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eReadings drifting or logging session resetting mid-measurement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when sustained sensor load pulls the battery output rail below the instrument's minimum operating voltage. Sensors and probe modules draw a spike of current at initialisation, and if the pack has partial degradation, voltage sag under that combined load causes the instrument's logic board to momentarily brown out — which resets the logging session. It is not a firmware issue. Check resting voltage first: a healthy pack should read 8.0–8.2V fully charged. If resting voltage is below 7.6V before any load, the cells are no longer holding full charge and the pack needs replacement.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360753844314,"sku":"BWCS-LI1HL-1","price":36.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360753877082,"sku":"BWCS-LI1HL-2","price":42.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360753909850,"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\/rayovac-rv-dc8100-replacement-battery-74v-3400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}