{"product_id":"custom-battery-pack-cs-oem123-replacement-battery-37v-1250mah-li-ion","title":"Custom Battery Pack CS-OEM123 Li-ion Replacement Battery 3.7V 1250mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCustom Battery Pack CS-OEM123 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 1250mAh Li-ion cell replaces the original battery in the CS-OEM123 device. It matches the OEM voltage rail and physical footprint — 50.00 × 35.95 × 6.92mm — so it seats correctly in the original bay. When the factory cell degrades or fails to hold a charge, this pack restores normal device operation.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCS-OEM123 fit:\u003c\/strong\u003e\n    This pack matches the voltage, form factor, and connector orientation the CS-OEM123 expects. The BMS on the device polls the pack on first boot; a voltage mismatch or physical gap in the bay causes immediate rejection before the device even powers the screen.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on the bench and confirmed the BMS handshake completes without error flags. The cell held 3.7V nominal across the discharge curve with no mid-cycle cutoff events.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install power cycle:\u003c\/strong\u003e\n    After swapping this pack in, power cycle the device completely — hold the power button until it fully shuts down, then restart. The CS-OEM123 runs an authentication handshake on boot, and a clean restart gives it the window it needs to recognise the new pack.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eOEM battery pack not recognised by the CS-OEM123 after swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe CS-OEM123 queries the battery pack over a short data line during boot — if the device was not fully powered down before the swap, that handshake can stall. This leaves the device showing a rejection flag even though the pack is physically seated. A full power-down and cold restart clears the stalled query. If the flag persists, connect the OEM charger and allow the pack to reach at least 3.9V before rebooting.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice voltage readout doesn't match the 3.7V spec after fitting\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells ship at storage voltage — typically 3.5V to 3.6V — not at the 3.7V nominal figure. The CS-OEM123 firmware reads pack voltage on boot and may display a low or mismatched reading until the cell is charged. Run one full charge cycle before drawing any conclusions about the pack's condition. After a complete charge, the device readout should align with the 3.7V nominal spec.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410889998426,"sku":"BWCS-OEM123-1","price":21.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43410890031194,"sku":"BWCS-OEM123-2","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43410890063962,"sku":"BWCS-OEM123-3","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OEM123-1.webp?v=1779581571","url":"https:\/\/batteryweb.com\/products\/custom-battery-pack-cs-oem123-replacement-battery-37v-1250mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}