{"product_id":"blackberry-classic-replacement-battery-38v-2500mah-li-polymer","title":"BlackBerry Classic BPCLS00001B Replacement Battery 3.8V 2500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBlackBerry Classic Q20 \/ SQC100-1 — 3.8V Li-Polymer Replacement Battery (BPCLS00001B)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.8V, 2500mAh Li-Polymer cell replaces the original battery in the BlackBerry Classic, Classic 4G, Q20, and SQC100-1. It matches the OEM footprint at 92.93 × 57.31 × 3.02mm and uses the same BPCLS00001B part reference. Fit this when the original cell no longer holds a full charge or shuts down unexpectedly under load.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eClassic \/ Q20 platform fit:\u003c\/strong\u003e\n    The Q20, SQC100-1, Classic, and Classic 4G all share the same battery bay dimensions, connector pinout, and BMS handshake protocol — one cell covers the entire platform without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on a Classic Q20 unit. The BMS accepted the new cell without fault codes, and charge termination triggered correctly at 4.2V.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated state.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Classic reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe BlackBerry Classic uses a coulomb-counter fuel gauge IC that builds its charge model against the original cell's discharge curve over hundreds of cycles. When you install a new 2500mAh cell, the IC is still referencing an aged cell model — typically one that drifted low on capacity. Until the IC recalibrates, percentage readings will be inaccurate and may jump erratically. Run one full discharge from 100% down to auto-shutoff, then charge uninterrupted to 100%, and the gauge will rebuild its reference map against the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC hasn't yet calibrated to the new cell's voltage curve — the phone doesn't recognise where the real voltage cliff sits. Under modem radio or screen load, the cell voltage dips sharply in the 3.5–3.6V range, and the BMS cuts power before the displayed percentage reaches zero. The fix is the same recalibration cycle: one full discharge to forced shutoff, then a full uninterrupted charge. After that cycle, the IC maps the actual cutoff voltage to the correct percentage on the new cell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404161908826,"sku":"BWCS-BRQ200SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404161941594,"sku":"BWCS-BRQ200SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404161974362,"sku":"BWCS-BRQ200SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BRQ200SL-1.webp?v=1779369251","url":"https:\/\/batteryweb.com\/products\/blackberry-classic-replacement-battery-38v-2500mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}