{"product_id":"angel-aj5803-replacement-battery-12v-2000mah-ni-mh","title":"Angel AJ5803 Medical Device Replacement Battery 12V 2000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAngel AJ5803 — 12V Ni-MH Replacement Battery (HYHB-762)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 12V, 2000mAh Ni-MH replacement battery for the Angel AJ5803 portable medical device. It replaces OEM part HYHB-762. When the original cell degrades, this restores the voltage rail the AJ5803 needs to complete its startup sequence and sustain normal operation.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAJ5803 voltage rail match:\u003c\/strong\u003e\n    The AJ5803 BMS expects a 12V Ni-MH charge profile. Substituting a different chemistry or voltage triggers a persistent battery fault because the charge IC and BMS handshake are calibrated to Ni-MH delta-V cutoff behaviour — not lithium charge curves.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through a full charge-discharge sequence and confirmed the BMS accepted the cell, delta-V cutoff fired at the correct voltage, and the device completed its power-on self-test without a battery fault flag.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap startup protocol:\u003c\/strong\u003e\n    After installing this battery, let the AJ5803 run its full power-on self-test without interruption. The BMS runs a chemistry verification check at boot — cutting power mid-sequence causes a false battery fault that persists until the next clean full reboot.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice not completing boot sequence on new battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe AJ5803 runs a BMS verification step during boot that checks cell voltage against a minimum threshold. A new Ni-MH cell fresh out of packaging often sits below 11.5V from self-discharge during shipping and storage. If the resting voltage is too low, the device stalls mid-boot or displays a battery error before the screen fully loads. Charge the battery to completion on the OEM or compatible charger before the first installation — confirm charge termination, then reinstall.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCharge indicator not reaching 100% on the first charge cycle\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH charge ICs use delta-V detection to find peak charge — on a brand-new cell, the voltage rise curve is flatter than a conditioned cell, so some chargers terminate early or report 90–95% instead of full. This is a first-cycle characteristic, not a cell fault. Run one complete charge-discharge-charge cycle to allow the charge IC to calibrate to the cell's actual voltage profile. After that cycle, the charge indicator should reach 100% and hold correctly.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381453946970,"sku":"BWCS-ANJ762MD-1","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381453979738,"sku":"BWCS-ANJ762MD-2","price":53.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381454012506,"sku":"BWCS-ANJ762MD-3","price":59.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ANJ762MD-1.webp?v=1778900875","url":"https:\/\/batteryweb.com\/products\/angel-aj5803-replacement-battery-12v-2000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}