{"product_id":"mova-305-replacement-battery-37v-1500mah-li-polymer","title":"Mova 305 Replacement Battery 3.7V 1500mAh Li-Polymer","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003emova 305 — 3.7V Li-Polymer Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1500mAh Li-Polymer cell is a direct replacement for the mova 305 smartphone. It fits the 305 handset and restores power to calls, messaging, and apps. Capacity is 1500mAh (5.55Wh), matching the original cell specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003emova 305 fit:\u003c\/strong\u003e\n    The 305 uses a slim Li-Polymer pouch cell running a 3.7V nominal rail. The charge IC and BMS on this handset expect a single-cell lithium profile — this replacement cell matches that profile, including the cutoff and charge termination voltages the board recognises.\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 under load typical of smartphone operation. The BMS held cutoff correctly at the low-voltage threshold and accepted charge termination without error flags on the host board.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging pushes current into an uncalibrated state.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the mova 305 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe mova 305 uses a fuel gauge IC that builds its charge estimate from the discharge curve of the old cell. When a new cell goes in, the IC is still referencing the old curve — so the percentage it reports can be off by 15–25%. The fix is one full uninterrupted discharge down to automatic shutdown, followed by a full charge to 100%. After that cycle, the coulomb counter resets its baseline against the new cell and readings stabilise. Do not top up or interrupt mid-cycle — a partial cycle does not trigger a full recalibration.\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 cell voltage drops faster than the fuel gauge predicted — the phone's processor or modem draws a burst of current, voltage sags below the BMS cutoff threshold, and the device shuts off even though the reported percentage still looked safe. A fresh Li-Polymer cell at room temperature should hold above 3.5V under load at 20% charge. If shutdowns persist after one full recalibration cycle, check that the battery connector is seated fully — a high-resistance connection amplifies voltage sag under load and triggers premature cutoff.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405210124378,"sku":"BWCS-UBP40SL-1","price":23.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43405210157146,"sku":"BWCS-UBP40SL-2","price":26.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43405210189914,"sku":"BWCS-UBP40SL-3","price":29.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-UBP40SL-big.webp?v=1779370333","url":"https:\/\/batteryweb.com\/products\/mova-305-replacement-battery-37v-1500mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}