{"product_id":"e-ten-glofiish-x500-replacement-battery-37v-2400mah-li-polymer","title":"E-TEN glofiish X500 Replacement Battery 3.7V 2400mAh 49004440","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eE-TEN glofiish X500 \/ X500+ — 3.7V Li-Polymer Replacement Battery (49004440_X500)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 2400mAh Li-Polymer cell replaces the original battery in the E-TEN glofiish X500 and X500+. Both devices share the same battery bay geometry, connector pinout, and charge IC protocol. Capacity is rated at 8.88Wh and sourced to match the original cell specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eX500 and X500+ compatibility:\u003c\/strong\u003e\n    Both variants use the same voltage rail, physical footprint, and BMS handshake. The charge IC on the glofiish platform communicates with the cell through a shared three-pin connector — this replacement carries the same configuration, so the device accepts it without firmware conflict.\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 a Windows Mobile platform matching the X500 charge profile. The BMS held cutoff at the correct upper voltage and did not trigger premature termination under simulated modem and display load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first install:\u003c\/strong\u003e\n    After fitting this cell, run one complete discharge down to auto-shutdown, then charge uninterrupted to 100% before normal use. The glofiish fuel gauge IC reads a coulomb counter calibrated to the old cell's discharge curve — one full cycle resets that baseline against the new cell.\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 glofiish X500 after cell replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe glofiish X500 runs a combined GSM modem and display load that draws current in sharp spikes. A new Li-Polymer cell has slightly higher internal impedance on early cycles, which causes a momentary voltage sag under that load. When terminal voltage dips below the BMS cutoff threshold — typically around 3.0V — the device shuts down even though the reported state of charge is still 20–30%. This is not a defective cell. After three to five full charge cycles, impedance drops and the voltage cliff disappears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eglofiish X500 stuck on boot loop or won't power on after extended storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-Polymer cells left discharged for months can drop below 2.5V per cell — at that point the BMS latches into a lockout state and blocks normal charging to prevent thermal runaway on a deeply depleted cell. The device will not power on and may not respond to the charger at all. Connect the original E-TEN charger and leave it for 20–30 minutes without pressing the power button — the charge IC will trickle current into the cell at a reduced rate until voltage climbs back above the BMS recovery threshold, approximately 2.9V, after which normal charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405147177050,"sku":"BWCS-EX500XL-1","price":28.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43405147209818,"sku":"BWCS-EX500XL-2","price":32.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43405147242586,"sku":"BWCS-EX500XL-3","price":35.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-EX500XL-big.webp?v=1779370262","url":"https:\/\/batteryweb.com\/products\/e-ten-glofiish-x500-replacement-battery-37v-2400mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}