{"product_id":"dhrm-dhr930d-replacement-battery-74v-13500mah-li-ion","title":"DHRM DHR930D 7.4V Medical Device Replacement Battery 13500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDHRM DHR930D — 7.4V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V 13500mAh (99.9Wh) lithium-ion battery for the DHRM DHR930D and DHR930-D portable medical device. It replaces the original cell pack when capacity has degraded from repeated charge cycles. No OEM part number applies to this unit.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDHR930D and DHR930-D compatibility:\u003c\/strong\u003e\n    Both model variants use the same 7.4V two-cell Li-ion pack, the same connector pinout, and the same BMS handshake protocol — one battery fits both 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 charge, hold, and load discharge. The BMS negotiated correctly, protection thresholds tripped at expected voltages, and cell balance held across the pack throughout testing.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePower-on self-test protocol:\u003c\/strong\u003e\n    After installing this battery, let the device complete its full startup self-test without interruption. Medical device firmware runs a BMS verification pass at boot — cutting power mid-sequence stores a false battery fault that persists until the next clean reboot.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDHR930D shutting off unexpectedly in the first ten cycles\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eMedical device load profiles draw harder on new cells than on broken-in ones, because the BMS applies tighter voltage-sag limits until it has learned the cell's internal resistance. During the first ten charge-discharge cycles, the pack's internal resistance reads higher than it will once the cells settle. The BMS interprets that sag as a low-state-of-charge condition and trips the cutoff early. Run the device through at least one full charge-discharge cycle before clinical use — this gives the BMS enough data to calibrate its cutoff threshold accurately.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCharge indicator stalling below 100% on the first charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn a new cell, the charge IC applies a conservative upper voltage limit until it has confirmed the pack's chemistry response. This causes the indicator to plateau at 95–98% and hold there rather than stepping to full. It is not a faulty cell — the charge IC is running a cautious completion pass. Let the charger finish the full cycle without interrupting it. After one complete charge, the IC recalibrates and subsequent cycles reach 100% normally.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381439463514,"sku":"BWCS-CMS900MX-1","price":83.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381439496282,"sku":"BWCS-CMS900MX-2","price":98.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381439529050,"sku":"BWCS-CMS900MX-3","price":109.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CMS900MX-1.webp?v=1778900837","url":"https:\/\/batteryweb.com\/products\/dhrm-dhr930d-replacement-battery-74v-13500mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}