{"product_id":"sony-nw-a1000-replacement-battery-37v-450mah-li-ion","title":"Sony NW-A1000 Replacement Battery CT019 3.7V 450mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSony NW-A1000 \/ NW-A1200 Series — 3.7V Li-ion Replacement Battery (CT019)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 450mAh Li-ion battery replaces the original CT019 (also listed as 1-157-607-11) in Sony's Network Walkman NW-A1000, NW-A1200, NW-A1200s, and NW-A1200v. It restores full power capacity to players that no longer hold charge after repeated cycle wear on the original cell. Capacity matches the stock spec at 450mAh \/ 1.67Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNW-A1000 and NW-A1200 compatibility:\u003c\/strong\u003e\n    These four models share the same PCB layout, connector pin-out, and BMS voltage thresholds, which is why Sony used a single cell part number — CT019 — across the entire sub-series. The cell slots into the same physical housing without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on NW-A1000 and NW-A1200 units and confirmed the BMS accepted charge from the dock connector without triggering a protection-trip fault. Charge acceptance, cutoff at full cell voltage, and low-voltage cutoff all matched expected behaviour for a 3.7V Li-ion single cell.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst charge after cell swap:\u003c\/strong\u003e\n    After fitting this battery, connect the player to its charger before powering it on. A freshly installed cell at partial charge can read below the player's minimum startup voltage. Letting the charger deliver a trickle for 15–20 minutes brings the cell above the BMS power-on threshold and prevents a false dead-device reading.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the NW-A1000 shuts down before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe NW-A1000's audio amplifier draws a current spike when driving headphone output at higher volumes. Near the end of a discharge cycle, cell voltage sags under that load and drops below the BMS cutoff threshold — even if the on-screen gauge still shows one or two bars. The device shuts off to protect the cell, not because the indicator is accurate. After a full charge cycle on the new cell, the voltage-to-percentage mapping recalibrates and the gauge becomes more consistent. If early shutdowns continue, run two full charge-to-discharge cycles to let the indicator settle.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery percentage jumping around erratically after fitting the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe NW-A1000 estimates charge level by reading cell voltage against a fixed lookup table stored in firmware. A new cell has a slightly different open-circuit voltage curve than an aged original, so the player's percentage estimate can jump — often 10–20% in either direction — during the first few charge cycles. This is not a fault with the cell or the player. Run two or three full charge and discharge cycles without interrupting them mid-way. By the third cycle the firmware's voltage readings stabilise and the display tracks actual capacity accurately.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381352169562,"sku":"BWCS-SA1000SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381352202330,"sku":"BWCS-SA1000SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381352235098,"sku":"BWCS-SA1000SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SA1000SL-1.webp?v=1778900214","url":"https:\/\/batteryweb.com\/products\/sony-nw-a1000-replacement-battery-37v-450mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}