{"product_id":"velocity-replacement-battery-74v-1600mah-li-polymer","title":"Velocity MLP385085-2S E-Reader Replacement Battery 7.4V 1600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eVelocity MLP385085-2S — 7.4V Li-Polymer Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 1600mAh Li-Polymer replacement battery carrying OEM part number MLP385085-2S. It fits compatible e-reader and e-book devices that originally shipped with this cell. At 112.50 x 95.00 x 4.50mm, the physical footprint matches the original bay dimensions.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eE-reader cell format:\u003c\/strong\u003e\n    Thin Li-Polymer cells like this one suit e-ink devices because the flat pouch construction fits the shallow battery bay without the rigid casing a cylindrical cell requires. The 7.4V nominal voltage matches the power rail these boards expect.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran charge and discharge cycles through the cell and monitored BMS cutoff behaviour at both ends of the voltage range. The protection circuit tripped correctly at the low-voltage threshold, preventing damage to the cell during a full drain.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst charge after installation:\u003c\/strong\u003e\n    E-reader firmware reads the battery percentage from a fuel gauge that recalibrates to the new cell during the first full charge cycle. Connect via USB immediately after installation and charge without interruption to the end of the cycle before powering on.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy e-readers show wildly incorrect battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eE-ink devices track battery state through a firmware fuel gauge that builds its reference model over time. When you swap the cell, the stored model no longer matches the new cell's actual charge curve. The percentage display will jump around — sometimes showing 100%, sometimes dropping to 20% within minutes — until the firmware recalibrates. One full charge-to-discharge-to-full cycle usually resets the gauge to an accurate reading.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eE-reader not powering on at all after fitting the new battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-Polymer cells ship in storage mode, typically around 3.7V per cell — enough to protect the chemistry in transit but below the minimum boot voltage most e-reader boards require. The device will not turn on until the cell reaches its operational threshold. Connect the USB cable to a wall adapter, not a PC port, and leave it for at least 10 minutes before pressing the power button. The charge indicator light or on-screen animation should appear before the device boots.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360263012442,"sku":"BWCS-PNR710SL-1","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360263045210,"sku":"BWCS-PNR710SL-2","price":41.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360263077978,"sku":"BWCS-PNR710SL-3","price":45.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PNR710SL-1.webp?v=1778611022","url":"https:\/\/batteryweb.com\/products\/velocity-replacement-battery-74v-1600mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}