{"product_id":"audiovox-cdm-8600-replacement-battery-37v-1000mah-li-ion","title":"AudioVox CDM-8600 Replacement Battery BTR-8500 3.7V 1000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAudioVox CDM-8600 \/ CDM-8500 — 3.7V Li-ion Replacement Battery (BTR-8500)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1000mAh Li-ion cell built to the BTR-8500 spec. It fits the AudioVox CDM-8600 and CDM-8500 handsets. Swap it in when the original cell no longer holds charge through a normal day of calls and messaging.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCDM-8600 and CDM-8500 compatibility:\u003c\/strong\u003e\n    Both handsets run the same 3.7V rail and use the same BTR-8500 connector footprint. The BMS handshake is identical across both models, so one cell covers the full platform without 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 CDM-8600 chassis. The BMS engaged charge termination correctly at 4.2V and held cut-off at the low-voltage threshold without tripping prematurely under call-load current draw.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after install:\u003c\/strong\u003e\n    On the CDM-8600, the fuel gauge IC retains the discharge curve of the old cell. After fitting this battery, run one complete discharge to auto-off, then charge to 100% without interruption. This lets the IC map the new cell's actual curve before it starts reporting percentage to the OS.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the CDM-8600 shuts off suddenly at 20–30% battery remaining\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff, not a capacity problem. When an aged cell can no longer sustain voltage under the current spike of a GSM transmission burst, the phone's protection circuit cuts power before the OS registers low battery. A fresh 1000mAh cell with lower internal resistance handles the surge load without the voltage drop that triggers the cutoff. After installing this battery, run a full discharge-to-charge cycle so the fuel gauge IC recalibrates its low-voltage threshold to the new cell's actual discharge curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone reads 100% immediately after install, then drops fast in the first hour\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe CDM-8600 fuel gauge IC stores a coulomb count calibrated to the old, degraded cell. It has no way to know the new cell's true capacity until it runs a full cycle. The percentage will look accurate after the first complete discharge and uninterrupted recharge. Do not judge the replacement cell's capacity from the first two partial cycles — let it finish a full cycle from auto-off shutdown to 4.2V charge termination first.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405154451546,"sku":"BWCS-AU8500SL-1","price":23.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43405154484314,"sku":"BWCS-AU8500SL-2","price":26.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43405154517082,"sku":"BWCS-AU8500SL-3","price":28.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AU8500SL-big.webp?v=1779370298","url":"https:\/\/batteryweb.com\/products\/audiovox-cdm-8600-replacement-battery-37v-1000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}