{"product_id":"wexler-e5001-replacement-battery-37v-800mah-li-polymer","title":"Wexler E5001 Compatible Battery 3.7V 800mAh YT453949","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eWexler E5001 — 3.7V Li-Polymer Replacement Battery (YT453949)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 800mAh lithium-polymer cell replacing part number YT453949 in the Wexler E5001 e-reader. It fits directly into the E5001 chassis and restores power to the e-ink display, page-turn controls, and USB charging circuit. Capacity matches the original specification at 2.96Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eE5001 cell format:\u003c\/strong\u003e\n    The E5001 uses a slim 45.80 × 37.64 × 4.50mm pouch cell — a form factor chosen to keep the reader thin. The connector and polarity match the original YT453949 exactly, so no wiring modification is needed.\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 E5001 board and confirmed the BMS accepted the cell without triggering a fault. The protection circuit responded correctly to both over-charge cutoff and low-voltage cutoff thresholds.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap charge cycle:\u003c\/strong\u003e\n    After fitting this cell, connect the E5001 to USB power and let it charge uninterrupted to 100% before first use. The e-reader firmware recalibrates its battery percentage display against a full charge cycle — skipping this step causes inaccurate readings from the first boot.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the E5001 battery percentage jumps after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe E5001 firmware tracks battery state using a coulomb counter that was calibrated to the old, degraded cell. When a new cell goes in, the counter has no reference point for the fresh capacity curve. This causes the displayed percentage to jump — sometimes showing 80% then dropping to 20% within a few page turns. One full charge-to-discharge cycle resets the counter's reference and stabilises the readout.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eE5001 showing low battery immediately after new cell installed\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eReplacement cells ship at storage voltage — typically around 3.6–3.7V — which sits below the threshold the E5001 firmware treats as a healthy charge state. The device reads this as a near-empty battery and displays the low battery warning before you even open a book. This is not a faulty cell. Connect the E5001 to a USB charger and charge it fully to 4.2V before attempting to power on normally.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360241614938,"sku":"BWCS-WXE501SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360241647706,"sku":"BWCS-WXE501SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360241680474,"sku":"BWCS-WXE501SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-WXE501SL-1.webp?v=1778611023","url":"https:\/\/batteryweb.com\/products\/wexler-e5001-replacement-battery-37v-800mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}