{"product_id":"welch-allyn-cp20-replacement-battery-12v-2300mah-sealed-lead-acid","title":"Welch Allyn CP20 Replacement Battery 12V 2300mAh SLA","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eWELCH ALLYN CP20 \/ CP10 Series — 12V Sealed Lead Acid Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 12V 2300mAh sealed lead-acid battery fits the WELCH ALLYN CP20, CP10, CP10i, and ECG (53013-0000) vital signs monitors. These compact clinical devices measure blood pressure, temperature, and pulse at the bedside, and depend on a healthy SLA cell to complete startup self-tests and sustain monitoring loads. Capacity is 2300mAh (27.6Wh) as specified.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCP20 \/ CP10 platform fit:\u003c\/strong\u003e\n    The CP20, CP10, and CP10i share the same 12V battery bay, connector pinout, and BMS communication profile. One cell covers all three variants. The ECG unit (53013-0000) uses the same voltage rail and physical footprint.\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 and controlled discharge on a CP-series unit. The BMS accepted the cell on first insertion, completed the power-on self-test without fault, and held voltage above the low-battery threshold through multiple monitoring sessions.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eStartup sequence after swap:\u003c\/strong\u003e\n    After installing this battery, allow the CP20 to complete its full power-on self-test without interruption. The BMS runs a voltage verification at boot — cutting power mid-sequence registers a false battery fault that persists until the next clean, uninterrupted 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 CP20 flags low battery immediately after a confirmed full charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe CP20's BMS compares resting voltage against a threshold calibrated to a conditioned OEM cell. A new SLA cell that hasn't completed its first full charge-discharge cycle sits slightly below that threshold, even when the charger shows complete. The device interprets this as a weak cell and triggers the low-battery alarm. Run one full charge-discharge cycle before clinical deployment — after that cycle, resting voltage climbs into the range the BMS accepts without alarming.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCP20 will not power on after the battery sat unused in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSLA cells self-discharge at roughly 3–5% per month. A cell stored for several months can drop below 10.5V — the recovery threshold most WELCH ALLYN BMS firmware treats as a deep-discharge lockout. The device won't boot because the BMS blocks output to protect the cell. Connect the unit to mains power and leave it charging uninterrupted for at least 12 hours. Once voltage recovers above 11V, the BMS re-enables output and the device powers on normally.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381387853914,"sku":"BWCS-SHT160MD-1","price":310.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381387886682,"sku":"BWCS-SHT160MD-2","price":370.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381387919450,"sku":"BWCS-SHT160MD-3","price":415.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SHT160MD-1.webp?v=1778900511","url":"https:\/\/batteryweb.com\/products\/welch-allyn-cp20-replacement-battery-12v-2300mah-sealed-lead-acid","provider":"BatteryWeb","version":"1.0","type":"link"}