{"product_id":"smiths-wzl-506-replacement-battery-12v-6000mah-ni-mh","title":"Smiths WZL-506 Medical Device Replacement Battery 12V 6000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSmiths WZL-506 — 12V Ni-MH Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 12V 6000mAh (72Wh) Ni-MH replacement battery for the Smiths WZL-506 portable medical device. It fits the WZL-506 platform directly and matches the voltage and capacity of the original cell. When the factory battery loses charge capacity or stops holding charge, this unit replaces it.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWZL-506 platform fit:\u003c\/strong\u003e\n    The WZL-506 operates on a 12V Ni-MH architecture with a charge management circuit that expects specific cell chemistry. Swapping to Li-ion is not viable here — the charge IC is calibrated for Ni-MH charge curves, and the BMS handshake requires Ni-MH cell response during startup verification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge-discharge sequences on a WZL-506 class load profile. The BMS accepted the cell without fault flags on cycle two, after the initial learn cycle completed on cycle one.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle self-test protocol:\u003c\/strong\u003e\n    After fitting this battery, allow the WZL-506 to complete its full power-on self-test without interruption. Medical devices in this class run BMS verification at startup, and cutting power mid-sequence stores a false battery fault that persists until the next complete 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 WZL-506 rejects a new cell on first boot\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe WZL-506 BMS runs a chemistry verification check each time a new or cold cell is installed. A fresh Ni-MH cell straight from storage has a resting voltage slightly outside the BMS's expected window for a fully charged OEM cell. This causes the device to flag the battery as unverified or degraded on the first cycle. One full charge-discharge cycle resets the learned parameters, and the BMS clears the flag on the next boot.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCharge indicator not reaching 100% on first charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn first charge, the WZL-506 charge IC applies a conservative current limit to a cell it has not yet profiled. This means the indicator may stall at 85–95% and not advance further. This is not a fault with the cell — the charge controller is applying a reduced top-up rate until cell impedance is logged. Run a full discharge and recharge cycle, and the charge IC will apply the correct full-charge threshold, typically reaching 100% by cycle two.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381465514074,"sku":"BWCS-SWL506MD-1","price":136.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381465546842,"sku":"BWCS-SWL506MD-2","price":159.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381465579610,"sku":"BWCS-SWL506MD-3","price":175.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SWL506MD-1.webp?v=1778901015","url":"https:\/\/batteryweb.com\/products\/smiths-wzl-506-replacement-battery-12v-6000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}