{"product_id":"sagem-ot860-replacement-battery-37v-900mah-li-ion","title":"Sagem OT860 Replacement Battery 3.7V 900mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSagem OT860 \/ OT890 — 3.7V Li-ion Replacement Battery (189950240)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 900mAh Li-ion cell replaces the original battery in the Sagem OT860 and OT890 smartphones. It matches OEM part numbers 189950240, SAAM-SN0, and SAAM-SN1. The cell measures 53.00 × 34.00 × 4.80mm — verify those dimensions against your original before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOT860 and OT890 compatibility:\u003c\/strong\u003e\n    Both models share the same battery bay dimensions, connector pinout, and BMS handshake protocol, which is why a single cell covers both. Voltage rail is 3.7V nominal across the platform.\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 the bench. The BMS accepted charge current without tripping, and the protection circuit engaged correctly at low-voltage cutoff — no runaway events observed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after fitting:\u003c\/strong\u003e\n    On first use, run one full discharge down to automatic shutdown, then charge uninterrupted to 100% before enabling any fast-charge option. This gives the fuel gauge IC a clean reference curve against the new cell — skipping it causes erratic percentage readings for several cycles.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the OT860 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the phone's fuel gauge IC is still calibrated to the discharge curve of the old, degraded cell. When the new cell hits a voltage point the IC associates with a safe state, it cuts power before the cell is actually empty. The modem radio drawing burst current during a call accelerates the voltage drop at that threshold. One full discharge-to-shutdown cycle followed by an uninterrupted charge resets the coulomb counter and clears the symptom.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone won't power on after the replacement battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge in storage, and if the voltage drops below approximately 2.5V per cell, the BMS enters lockout mode to prevent damage. The phone will show no response — no boot screen, no charge indicator. Connect the phone to a charger and leave it for 15–20 minutes without pressing the power button; the charge IC needs time to trickle current into the cell and push voltage above the BMS re-enable threshold. Once the charge indicator appears, a normal charge cycle can begin.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405024952410,"sku":"BWCS-MY890SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405024985178,"sku":"BWCS-MY890SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405025017946,"sku":"BWCS-MY890SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MY890SL-1.webp?v=1778767243","url":"https:\/\/batteryweb.com\/products\/sagem-ot860-replacement-battery-37v-900mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}