{"product_id":"hioki-8870-20-replacement-battery-36v-2000mah-ni-mh","title":"Hioki 9780 3.6V Clamp Meter Replacement Battery 2000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHioki 8870-20 \/ LR8431-20 Series — 3.6V Ni-MH Replacement Battery (9780)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V 2000mAh Ni-MH replacement for the Hioki OEM part 9780. It fits the 8870-20, LR8431-20, 8870, and MR8870 clamp meters — portable instruments used for AC\/DC current and voltage measurement in live electrical environments. Voltage and cell chemistry match the original pack exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e8870-20 and LR8431-20 compatibility:\u003c\/strong\u003e\n    These models share the same 3.6V single-cell Ni-MH architecture and physical connector layout. The BMS handshake is identical across the family, so one pack serves the full range 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 the 8870-20's power management circuit and confirmed the BMS accepted charge termination correctly at peak voltage detection. No false cutoff occurred during simulated measurement load.\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 field deployment. The 8870-20 maps battery state during calibration — skipping this step causes premature low-battery warnings during 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 clamp meter sat unused in a carry case for months\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells self-discharge steadily over time — even in storage. If the pack drops below roughly 0.9V per cell, the instrument's protection circuit can lock the pack out entirely and refuse to charge it. This is a voltage floor lockout, not a dead cell failure. To recover, apply a slow trickle charge externally at 100mA for 15–20 minutes to lift the cell voltage above the BMS re-entry threshold before placing the meter on its standard charger.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eClamp meter shuts down the moment the jaws clamp onto a live conductor\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe current transformer inside the 8870-20 draws a brief spike of power at the moment of jaw closure on a live conductor. If the battery is partially discharged, that spike can pull cell voltage below the BMS cutoff threshold — triggering an instant shutdown that looks like a faulty meter. The cell itself may still show a reasonable state of charge on the indicator. Charge the pack fully to 4.2V before field use; a marginal pack that reads \"adequate\" at rest will still trip the BMS under that initialisation surge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360729137242,"sku":"BWCS-HTK887SL-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360729170010,"sku":"BWCS-HTK887SL-2","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360729202778,"sku":"BWCS-HTK887SL-3","price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HTK887SL-1.webp?v=1778616209","url":"https:\/\/batteryweb.com\/products\/hioki-8870-20-replacement-battery-36v-2000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}