{"product_id":"archos-40-power-replacement-battery-38v-1900mah-li-ion","title":"Archos 40 Power AC40PO Compatible Battery 3.8V 1900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eArchos 40 Power — 3.8V Li-ion Replacement Battery (AC40PO)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V, 1900mAh Li-ion battery for the Archos 40 Power smartphone. It replaces the original cell when the phone no longer holds a charge or shuts down unexpectedly. Capacity matches OEM spec at 7.22Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eArchos 40 Power compatibility:\u003c\/strong\u003e\n    The 40 Power uses a fixed connector pinout tied to the AC40PO part number. The BMS handshake runs over the same two-wire thermistor line as the original cell, so the phone's charge IC recognises the replacement without any modification.\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 40 Power platform. The BMS accepted the charge IC handshake on the first cycle, and protection thresholds — overvoltage cutoff at 4.2V and undervoltage cutoff near 2.5V — triggered correctly at both limits.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging begins. Skipping this step causes the OS to read percentage from the old curve, which can produce erratic jumps or premature low-battery warnings.\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 Archos 40 Power\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff failure. When the modem or screen draws high current, cell voltage sags below the BMS protection threshold before the fuel gauge reaches 0%. The phone cuts off because the cell cannot sustain load voltage — not because capacity is exhausted. It happens most often on aged cells but can also appear in the first few cycles on a new cell if the fuel gauge IC is still calibrated to the old cell's curve. Run one full discharge to shutdown, then a full charge to 4.2V, to anchor the coulomb counter to the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone not powering on after the battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells that sit discharged below roughly 2.5V per cell trigger BMS lockout — a protection state that blocks current flow until a minimum recovery voltage is applied. The 40 Power will show nothing on screen and will not respond to a short press of the power button. Connect the phone to a wall charger, not a PC USB port, and leave it for 15–20 minutes without pressing anything. The charge IC on the phone trickle-charges the cell back above the BMS recovery threshold, typically around 2.8V, at which point the BMS unlocks and normal charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392046432346,"sku":"BWCS-AVP400SL-1","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392046465114,"sku":"BWCS-AVP400SL-2","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392046497882,"sku":"BWCS-AVP400SL-3","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AVP400SL-1.webp?v=1779143124","url":"https:\/\/batteryweb.com\/products\/archos-40-power-replacement-battery-38v-1900mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}