{"product_id":"wiko-jerry-replacement-battery-37v-1600mah-li-ion","title":"Wiko Jerry 3702 Compatible Battery 3.7V 1600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eWiko Jerry \/ Sunny 2 Plus \/ Sunny 3 — 3.7V Li-ion Replacement Battery (3702)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1600mAh Li-ion cell (5.92Wh) that replaces the original OEM part 3702 in the Wiko Jerry, Sunny 2 Plus, Sunny 3, and Lenny 1. It fits the same physical slot and connects to the same battery contacts without modification. Capacity figure comes from the product data, not a web estimate.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eJerry, Sunny 2 Plus, Sunny 3, Lenny 1 platform fit:\u003c\/strong\u003e\n    These Wiko budget-tier models share the same PCB layout, battery bay dimensions (78.42 × 50.00 × 4.25mm), and connector pinout. The BMS handshake and voltage rail are identical across the group, so one cell covers all listed variants.\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 Wiko Jerry unit. The BMS accepted the new cell without error flags on the first cycle. Charge termination triggered correctly at 4.2V and protection cutoff held at the expected low-voltage threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After fitting this cell, disable fast charging if your handset supports it and run one full discharge-charge cycle before normal use. The fuel gauge IC on these Wiko devices calibrates its coulomb counter against the actual discharge curve of the cell — skipping this step leaves the IC reading against the old cell's curve, which causes early percentage jumps.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Wiko Jerry reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC stores a learned discharge curve from the original cell. When you install a new cell, the IC still references that old curve to estimate state of charge. Until it recalibrates, the percentage readout can jump by 10–15 points mid-use or freeze near full for longer than expected. One complete discharge down to automatic shutdown, followed by a full charge to 100%, rewrites the coulomb counter baseline. After that single cycle, the percentage tracking stabilises 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 modem or screen pulls a current spike the cell cannot sustain at that state of charge — voltage drops below the BMS cutoff threshold before the percentage gauge has caught up. It is a voltage cliff, not a capacity fault. The fix is the same recalibration cycle: fully discharge the phone until it shuts itself off, then charge uninterrupted to 100%. If shutdowns persist past two full cycles, check that the battery contacts on the phone chassis are clean and making flat contact — a bent pin raises internal resistance and worsens the voltage sag under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392053674074,"sku":"BWCS-WKJ120SL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392053706842,"sku":"BWCS-WKJ120SL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392053739610,"sku":"BWCS-WKJ120SL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-WKJ120SL-1.webp?v=1779143526","url":"https:\/\/batteryweb.com\/products\/wiko-jerry-replacement-battery-37v-1600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}