{"product_id":"plum-e800-replacement-battery-37v-1100mah-li-ion","title":"Plum E800 Replacement Battery 3.7V 1100mAh PM-BATE800","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePlum E800 — 3.7V Li-ion Replacement Battery (PM-BATE800)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1100mAh Li-ion replacement battery for the Plum E800 smartphone. It replaces OEM part PM-BATE800 and fits the E800 directly. Capacity is rated at 4.07Wh — matching the original cell specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eE800 fitment:\u003c\/strong\u003e\n    The E800 uses a single-cell 3.7V nominal Li-ion configuration with a low-current BMS. This replacement cell matches the connector pinout and voltage rails that the phone's charge IC expects, so the handshake between the battery and the board completes without errors.\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 on an E800 board. The BMS accepted the charge IC handshake on the first connection, and protection circuits — overcurrent, overvoltage, and thermal — all triggered at expected thresholds.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    After installing this cell, disable fast charging if available and run one complete discharge down to automatic shutoff, then charge uninterrupted to 100%. The E800's fuel gauge IC calibrates its coulomb counter against the new cell's discharge curve during that first cycle — skipping it 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\"\u003eWhy the E800 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe E800's fuel gauge IC builds its charge estimate from a stored discharge curve tied to the old cell. When a new cell goes in, that curve no longer matches actual cell behaviour — so the reported percentage drifts from the real state of charge. This shows up as sudden jumps in the percentage indicator or a reading that stays stuck at one value for long stretches. One full uninterrupted discharge-to-shutoff and charge-to-100% cycle forces the coulomb counter to relearn the new cell's curve and corrects the readout.\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 below the modem or screen load threshold before the fuel gauge reaches 0%. Under GSM transmission bursts or screen-on current draw, a cell with any internal resistance will sag in voltage faster than the gauge predicts. The E800 interprets this voltage cliff as a hard cutoff and shuts down even though the displayed percentage still reads in the 20–30% range. Completing a full recalibration cycle — discharge to shutoff, uninterrupted charge to 100% — realigns the fuel gauge to the actual usable voltage window of the new cell. After calibration, the shutdown point should track below 5%.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391882985562,"sku":"BWCS-PLE800SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391883018330,"sku":"BWCS-PLE800SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391883051098,"sku":"BWCS-PLE800SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PLE800SL-1.webp?v=1779142499","url":"https:\/\/batteryweb.com\/products\/plum-e800-replacement-battery-37v-1100mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}