{"product_id":"e-ten-glofiish-x500-replacement-battery-37v-3000mah-li-polymer","title":"E-TEN glofiish X500 Replacement Battery 3.7V 3000mAh 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 3000mAh Li-Polymer battery replaces the original cell in the E-TEN glofiish X500 and X500+. Both devices share the same battery bay dimensions and connector, so one part covers both models. Capacity is 3000mAh (11.1Wh) — drawn from product data, not estimated.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eX500 and X500+ shared battery bay:\u003c\/strong\u003e\n    Both models use the same 65.98 × 45.39 × 10.40mm cell footprint and the same two-pin connector orientation. The BMS handshake logic is identical across both revisions, so the replacement integrates without hardware modification.\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 the glofiish X500 platform. The BMS held charge acceptance cleanly, the protection circuit tripped correctly at low-voltage cutoff, and the fuel gauge IC tracked state-of-charge without erratic jumps after the first full cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fuel gauge reset:\u003c\/strong\u003e\n    On first use after installation, run one complete discharge to auto-shutoff followed by a full uninterrupted charge. The glofiish fuel gauge IC calibrates its coulomb counter against the new cell's discharge curve during this cycle — skipping it leaves the percentage readout misaligned by as much as 15–20%.\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\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe X500's Windows Mobile platform draws a hard spike when the GSM modem transmits or the display backlight hits full brightness. An aged or deeply discharged cell can no longer sustain voltage under that load — it sags below the BMS cutoff threshold even while the fuel gauge still reads 20–30%. This is a voltage-cliff failure, not a capacity failure. The fix is a full recalibration cycle: discharge the new cell to auto-shutoff, then charge uninterrupted to 100%, which anchors the fuel gauge IC to the actual discharge curve of the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice won't power on after the battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-Polymer cells self-discharge in storage. If the glofiish X500 or the replacement cell was stored without use for several months, the cell voltage can drop below 2.5V per cell — the point at which the BMS locks out to prevent damage. The device will show no response at all: no boot screen, no charge indicator. Connect the original E-TEN charger and leave it for 20–30 minutes without pressing the power button; most BMS circuits on this platform include a trickle-recovery mode that brings the cell back above 3.0V before allowing normal charge current. Once the charge LED activates, the BMS has re-initialised and normal charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405148618842,"sku":"BWCS-EX500HL-1","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405148651610,"sku":"BWCS-EX500HL-2","price":32.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405148684378,"sku":"BWCS-EX500HL-3","price":35.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-EX500HL-1.webp?v=1779370297","url":"https:\/\/batteryweb.com\/products\/e-ten-glofiish-x500-replacement-battery-37v-3000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}