{"product_id":"aligator-a290-replacement-battery-37v-1200mah-li-ion","title":"Aligator A290 Replacement Battery 3.7V 1200mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAligator A290 \/ A330 \/ A350 \/ A400 Series — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1200mAh Li-ion battery for the Aligator A290, A330, A350, A400, and compatible models in the same series. It replaces the original cell when the phone no longer holds a useful charge between sessions. Dimensions are 53.00 × 34.00 × 5.70mm — verify against your existing battery before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMulti-model fit across the Aligator budget series:\u003c\/strong\u003e\n    The A290, A330, A350, and A400 share the same battery bay dimensions and 3.7V single-cell architecture. The connector pinout and BMS handshake protocol are consistent across these models, which is why one cell covers the group.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge passes on a compatible handset. The BMS held protection thresholds correctly and the charge IC accepted current without triggering cutoff prematurely.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After fitting this battery, run one complete discharge down to auto-shutoff, then charge to 100% uninterrupted. This gives the phone's fuel gauge IC a full reference curve to map the new cell — skipping this step causes erratic percentage readings in the first few days of use.\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 Aligator A290 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff problem, not a capacity problem. The Aligator A290's modem and display draw a combined load spike that a freshly installed, uncalibrated cell cannot sustain at lower state-of-charge. The cell voltage drops momentarily below the BMS cutoff threshold — around 3.0V under load — and the phone shuts off even though the fuel gauge still shows charge remaining. One full reference cycle resolves this in most cases: discharge to auto-shutoff, charge to 100%, then repeat once more if the shutdowns persist.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone not powering on after the replacement battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If this battery has been stored a long time before installation, the cell voltage may have dropped below 2.5V — the threshold at which the BMS enters lockout mode to prevent damage. The phone will show nothing when you press the power button. Connect the phone to a charger and leave it for 15–20 minutes without attempting to power on; the charge IC will trickle current into the cell to bring it above the BMS recovery threshold, typically around 2.9V, before normal charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404283936858,"sku":"BWCS-WKL003SL-1","price":21.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404283969626,"sku":"BWCS-WKL003SL-2","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404284002394,"sku":"BWCS-WKL003SL-3","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-WKL003SL-1.webp?v=1779369617","url":"https:\/\/batteryweb.com\/products\/aligator-a290-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}