{"product_id":"h-wave-muscle-stimulator-p4t-4-replacement-battery-12v-800mah-ni-cd","title":"H-Wave Muscle Stimulator P4T-4 Replacement Battery 12V 800mAh B11677","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eH-Wave Muscle Stimulator P4T-4 — 12V Ni-CD Replacement Battery (B11677)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 12V 800mAh Ni-CD battery for the H-Wave Muscle Stimulator P4T-4 electrical muscle stimulation device. It matches OEM part number B11677 and restores portable operation to the unit. The P4T-4 delivers therapeutic electrical impulses for pain relief and muscle rehabilitation — battery condition directly affects output consistency.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eP4T-4 platform fit:\u003c\/strong\u003e\n    The P4T-4 uses a 12V Ni-CD cell pack with a specific connector orientation and BMS handshake tied to Ni-CD charge curve recognition. Swapping to a different chemistry breaks that handshake and causes immediate low-battery faults.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on the P4T-4 bench setup and confirmed the BMS accepted the new pack without fault codes. The charge IC applied a conservative initial limit, which cleared after the first full charge-discharge cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap self-test protocol:\u003c\/strong\u003e\n    After installing this battery, let the P4T-4 complete its full power-on self-test without interruption. The device runs a BMS verification sequence at startup — 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\"\u003eWhy the P4T-4 alarms low battery immediately after a confirmed full charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe P4T-4's BMS compares the new cell's voltage response against a threshold calibrated to a conditioned Ni-CD pack. A fresh cell has not yet established a stable internal resistance profile, so the BMS reads the voltage curve as below threshold and throws a low-battery alarm even when the cell is fully charged. This clears after one complete charge-discharge cycle. Run the device through that cycle before using it clinically.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eP4T-4 failing to power on after the battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-CD cells self-discharge at roughly 10–20% per month. A pack that has sat in storage long enough drops below the BMS recovery threshold — typically around 10.5V for a 12V Ni-CD — and the device refuses to boot. The BMS interprets a deeply discharged cell as a faulty or absent pack. Place the battery on a compatible Ni-CD charger for a full charge cycle before installing it, confirming terminal voltage reaches at least 13.2V before fitting it to the P4T-4.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381369700442,"sku":"BWCS-HWV410MD-1","price":76.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381369733210,"sku":"BWCS-HWV410MD-2","price":90.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381369765978,"sku":"BWCS-HWV410MD-3","price":101.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HWV410MD-1.webp?v=1778900351","url":"https:\/\/batteryweb.com\/products\/h-wave-muscle-stimulator-p4t-4-replacement-battery-12v-800mah-ni-cd","provider":"BatteryWeb","version":"1.0","type":"link"}