{"product_id":"base-varia-replacement-battery-37v-1500mah-li-ion","title":"BASE VARIA Smartphone Replacement Battery 3.7V 1500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBASE VARIA — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1500mAh Li-ion battery for the BASE VARIA smartphone. It slots into the VARIA to restore power after the original cell degrades or fails to hold charge. Voltage and capacity match the original specification exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVARIA platform fit:\u003c\/strong\u003e\n    The VARIA runs a single-cell 3.7V architecture. The charge IC and BMS handshake are calibrated to this voltage rail — swapping to a mismatched cell trips the protection circuit. This replacement matches the cell count, connector, and BMS communication the VARIA expects.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge, standby, and active load on the bench. The BMS held cutoff correctly at both the low-voltage floor and the 4.2V charge ceiling. No thermal event, no mid-cycle disconnect.\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 map its coulomb counter against the new cell's actual 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 VARIA reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe VARIA's fuel gauge IC stores a learned discharge curve from the old cell. When a new cell goes in, that stored curve no longer matches what the new cell actually does under load. The IC reads voltage and estimates percentage against the wrong model, so the number on screen drifts. One full discharge-to-shutdown followed by a full uninterrupted charge cycle forces the IC to relearn the curve against the new cell. After that cycle, percentage reporting stabilises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the VARIA after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC is still calibrated to the old cell and misjudges the remaining voltage. The new cell hits its actual low-voltage floor — typically around 3.4V — while the display still shows 20–30%. The modem or screen draws a short current spike, the cell can't sustain voltage, and the BMS trips. Run one full cycle with the screen on and mobile data active to accelerate recalibration and confirm the cell can sustain load voltage above 3.5V at the reported 20% mark.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405009846362,"sku":"BWCS-OT918SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405009879130,"sku":"BWCS-OT918SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405009911898,"sku":"BWCS-OT918SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OT918SL-1.webp?v=1779369819","url":"https:\/\/batteryweb.com\/products\/base-varia-replacement-battery-37v-1500mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}