{"product_id":"astellkern-ak300-replacement-battery-38v-3300mah-li-polymer","title":"Astell\u0026Kern AK300 Replacement Battery CP-AK380 3.8V 3300mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAstell\u0026amp;Kern AK300 \/ AK380 — 3.8V Li-Polymer Replacement Battery (CP-AK380)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V, 3300mAh lithium-polymer battery for the Astell\u0026amp;Kern AK300 and AK380 portable high-resolution audio players. It replaces OEM part CP-AK380 and fits the same cell cavity dimensions: 78.00 × 42.64 × 6.26mm. Capacity is 12.54Wh — matched to the original specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAK300 and AK380 compatibility:\u003c\/strong\u003e\n    Both models share the CP-AK380 cell format, the same 3.8V nominal voltage rail, and an identical BMS handshake protocol. One cell fits both units without any hardware modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the AK300. The BMS accepted the cell without a fault flag, voltage held steady across the mid-charge range, and the protection circuit tripped correctly at the low-voltage cutoff threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install charge cycle on the AK300\/AK380:\u003c\/strong\u003e\n    After fitting this cell, connect the player to its original charger and let it charge fully before powering on. Media players with depleted cells often enter a deep-discharge protection state that requires slow trickle current before the BMS will accept a standard charge rate. Skipping this step can cause the device to show no charge activity for the first 20–30 minutes.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery percentage jumping after a cell swap on the AK300\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe AK300 estimates state-of-charge using voltage thresholds calibrated to the original cell's discharge curve. A new cell has a slightly different resting voltage profile, so the indicator can read 80% one moment and drop to 60% minutes later. This is a recalibration issue, not a cell defect. Run two or three full charge-to-discharge cycles and the on-screen percentage will stabilise as the firmware maps the new cell's actual curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePlayback cutting out before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe AK300's audio amplifier draws a brief current spike when driving low-impedance headphones or balanced outputs at high volume. Near the end of a discharge cycle, cell voltage sags under that spike and drops below the BMS cutoff threshold — the player shuts down even though the indicator hasn't reached zero. This isn't a faulty battery; it's the protection circuit doing its job. To reduce premature cutoffs, lower output gain by one step in the AK300's settings and recharge when the indicator reaches 15%.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381328412762,"sku":"BWCS-TAK380SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381328445530,"sku":"BWCS-TAK380SL-2","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381328478298,"sku":"BWCS-TAK380SL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TAK380SL-1.webp?v=1778900030","url":"https:\/\/batteryweb.com\/products\/astellkern-ak300-replacement-battery-38v-3300mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}