{"product_id":"alcatel-ot-s210-replacement-battery-37v-600mah-li-ion","title":"Alcatel OT-S210 Replacement Battery 3.7V 600mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAlcatel OT-S210 \/ OT-S211 Series — 3.7V Li-ion Replacement Battery (CAB2001010C1)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 600mAh Li-ion cell for the Alcatel OT-S210, OT-S211, OT-S211C, and One Touch S210 series. These are compact candybar-style mobile phones from the mid-2000s whose original batteries have aged past useful capacity. OEM part numbers CAB2001010C1, OT-BY25, B-U81, and CAB2001011C1 all cross to this cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOT-S210 and OT-S211 shared battery platform:\u003c\/strong\u003e\n    These models use the same 37 × 37 × 5.10mm cell footprint, identical connector orientation, and the same BMS handshake voltage threshold — so one cell covers the full S210\/S211 family without modification.\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 the OT-S211. The BMS accepted charge correctly, protection tripped cleanly at the low-voltage cutoff, and the phone powered through calls and SMS without sagging off.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after installation:\u003c\/strong\u003e\n    The OT-S210 series uses a basic fuel gauge IC that tracks coulombs against the original cell's discharge curve. After fitting a new cell, run one complete discharge down to auto-shutdown, then charge uninterrupted to 100% before normal use — this resets the gauge to the new cell's actual capacity.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the OT-S210 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe phone's fuel gauge IC builds its capacity model from the discharge curve of whichever cell was installed at the factory. Swap in a fresh cell and that model is now mismatched — the IC is counting coulombs against a curve that no longer applies. The percentage reading becomes unreliable until recalibration happens. One full discharge-to-shutdown followed by a complete uninterrupted charge cycle forces the IC to rewrite its reference curve against the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone shuts down suddenly while showing 20–25% remaining\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff issue. At around 3.5–3.6V, an aged or uncalibrated cell cannot sustain voltage under the current draw of an active call or screen backlight — the terminal voltage drops sharply and the phone's low-voltage cutoff fires before the gauge reaches 0%. A fresh cell with a correctly calibrated fuel gauge eliminates this because the actual resting voltage at 20% is now higher and stable. If the shutdown persists after one full calibration cycle, check that the cell is seated flush and the contact pads are clean — poor contact adds resistance that accelerates voltage sag.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405084000346,"sku":"BWCS-OTS210SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405084033114,"sku":"BWCS-OTS210SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405084065882,"sku":"BWCS-OTS210SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OTS210SL-1.webp?v=1779369920","url":"https:\/\/batteryweb.com\/products\/alcatel-ot-s210-replacement-battery-37v-600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}