{"product_id":"saunalahti-elisa-replacement-battery-37v-1300mah-li-ion","title":"Saunalahti Elisa Replacement Battery 3.7V 1300mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSaunalahti Elisa \/ Blade — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1300mAh Li-ion cell that replaces the internal battery in the Saunalahti Elisa and Blade smartphones. It slots into the original battery bay and connects via the stock ribbon connector. Capacity is 1300mAh (4.81Wh) — identical to the factory spec.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eElisa and Blade compatibility:\u003c\/strong\u003e\n    Both models run the same 3.7V battery bay, connector pinout, and BMS handshake. One cell covers either device without any adapter or modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through a full charge and discharge on the Elisa platform. The BMS accepted the cell without error flags, and charge termination triggered correctly at 4.2V.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first install:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Elisa reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Elisa uses a fuel gauge IC that builds a discharge model based on the previous cell's internal resistance and voltage curve. When a new cell goes in, the IC is still referencing the old model. The percentage readout will appear inflated or deflated until the IC relearns the new curve. One full discharge to auto-shutdown followed by an uninterrupted charge to 100% resets the coulomb counter and corrects the displayed percentage.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% remaining on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the modem or screen draws a short burst of current and the cell voltage drops below the BMS cutoff threshold — even though the fuel gauge still shows charge remaining. On a new cell that has not yet been calibrated, the fuel gauge IC cannot accurately predict where the voltage cliff sits. The fix is the same recalibration cycle: drain to shutdown, then charge to full without interruption. If shutdowns persist past two full cycles, check that the battery connector is fully seated — a partial connection raises contact resistance and worsens voltage sag under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405092520026,"sku":"BWCS-ZTE950SL-1","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405092552794,"sku":"BWCS-ZTE950SL-2","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405092585562,"sku":"BWCS-ZTE950SL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ZTE950SL-1.webp?v=1779369970","url":"https:\/\/batteryweb.com\/products\/saunalahti-elisa-replacement-battery-37v-1300mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}