{"product_id":"prunus-l-288-replacement-battery-37v-1200mah-li-ion","title":"Prunus L-288 Replacement Battery 3.7V 1200mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePrunus L-288 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1200mAh Li-ion cell for the Prunus L-288 mobile phone. It fits the L-288 directly, restoring power when the original cell has degraded or failed. Capacity is 4.44Wh — matched to the original specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eL-288 cell compatibility:\u003c\/strong\u003e\n    The L-288 uses a compact single-cell pack at 3.7V nominal. The physical footprint is 53.00 × 33.90 × 5.70mm — any deviation will prevent the rear cover from seating or cause connector misalignment. This cell matches all three dimensions.\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 handshake correctly, held voltage above 3.6V through mid-discharge, and tripped protection at the expected low-voltage threshold without false cutoffs.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one full discharge-to-charge cycle before resuming normal use. The phone's fuel gauge IC was calibrated to the old cell's discharge curve — one full cycle lets it remap to the new cell before high-current charging begins.\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 Prunus L-288 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff issue, not a capacity problem. A fresh cell has a slightly different discharge curve than the degraded original — the fuel gauge IC still uses the old curve to estimate state of charge. When the phone reports 25%, the new cell may already be at 3.5V or lower under modem and screen load, which crosses the BMS cutoff threshold. The phone shuts off before the display reaches 0%. One full discharge-charge cycle forces the coulomb counter to re-anchor its curve to the new cell, and the shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery percentage jumping erratically after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eErratic percentage readings — jumping from 60% to 80% or dropping suddenly — point to a fuel gauge IC that has not yet mapped the new cell. The IC uses stored charge-curve data from the old, degraded cell to estimate remaining capacity, and the mismatch produces unstable readings. This is not a fault with the replacement cell itself. Drain the phone fully until it shuts down automatically, charge uninterrupted to 100%, and the gauge will stabilise from that point forward.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404140183642,"sku":"BWCS-AVC120SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404140216410,"sku":"BWCS-AVC120SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404140249178,"sku":"BWCS-AVC120SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AVC120SL-1.webp?v=1779369080","url":"https:\/\/batteryweb.com\/products\/prunus-l-288-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}