{"product_id":"welch-allyn-211-replacement-battery-24v-800mah-ni-cd","title":"Welch-Allyn 211 Otoscope Replacement Battery 2.4V 800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eWelch-Allyn 211 Otoscope Series — 2.4V Ni-CD Replacement Battery (B11617)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 2.4V 800mAh Ni-CD replacement battery for the Welch-Allyn 211 otoscope and related handles including the 72600, 72800, and 72801. It replaces OEM part numbers B11617, 72600, AB24667, and several cross-reference codes used across medical supply distributors. Physical dimensions are 104.62 x 15.82 x 14.58mm — verify against your handle cavity before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e211 handle platform:\u003c\/strong\u003e\n    The 211, 72600, 72800, and 72801 share the same cylindrical handle form factor, 2.4V voltage rail, and connector orientation. The BMS in these handles expects a Ni-CD cell profile — voltage rise on charge and a flat discharge curve. A different chemistry will either fail to charge or trigger a false low-battery fault.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on a 211 handle. The BMS accepted the cell without fault codes, and the charge indicator progressed normally. Capacity matched rated 800mAh within acceptable tolerance at cycle three.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use cycle on medical handles:\u003c\/strong\u003e\n    After installing this cell, allow the otoscope to complete its power-on self-test without switching it off mid-sequence. The 211-series handle runs a BMS verification check at startup. Interrupting that check before it finishes causes a persistent battery fault flag that clears only on 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 211 handle reads low battery after a confirmed full charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe 211 handle's charge IC was calibrated against an aged OEM cell with a worn voltage curve. A fresh Ni-CD cell charges to a slightly higher terminal voltage, and the BMS can interpret that unfamiliar profile as an anomaly on the first cycle. This causes a low-battery indication even when the cell is fully charged. One complete charge-discharge cycle recalibrates the BMS to the new cell's curve. After that first cycle, the indicator reads correctly.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eOtoscope will not power on after the replacement cell sat unused in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-CD cells self-discharge during storage — at a rate of roughly 1–2% per day, a cell stored for several months can drop below the BMS recovery threshold, typically around 1.0V per cell. When voltage falls that low, the handle's BMS will not initiate a charge cycle and the device appears completely dead. Place the cell on a standalone Ni-CD charger first to bring it above 2.0V total. Once it clears that threshold, reinstall it in the handle and charge normally.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381518925914,"sku":"BWCS-WB726MD-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381518958682,"sku":"BWCS-WB726MD-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381518991450,"sku":"BWCS-WB726MD-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-WB726MD-1.webp?v=1778901386","url":"https:\/\/batteryweb.com\/products\/welch-allyn-211-replacement-battery-24v-800mah-ni-cd","provider":"BatteryWeb","version":"1.0","type":"link"}