{"product_id":"audiovox-cdm-1100-replacement-battery-37v-1000mah-li-ion","title":"AudioVox BTR1100 Compatible Battery 3.7V 1000mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAudioVox CDM-1100 \/ CDM-130 — 3.7V Li-ion Replacement Battery (BTR1100)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1000mAh Li-ion replacement battery for the AudioVox CDM-1100 and CDM-130 candybar mobile phones. It uses OEM part number BTR1100 and slots directly into the original battery bay. Capacity is rated at 3.7Wh, matching the original cell specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCDM-1100 and CDM-130 compatibility:\u003c\/strong\u003e\n    Both handsets run the same 3.7V single-cell Li-ion rail and use the same battery bay dimensions, connector pinout, and BMS communication protocol — so one cell covers both models without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled the cell through charge and discharge on CDM-series hardware. The BMS accepted the cell without triggering a fault, charge termination fired correctly at full voltage, and the protection circuit responded normally to low-voltage cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    The CDM-1100 tracks capacity using a simple fuel gauge IC calibrated to the old cell's discharge curve. After installing this battery, run one full discharge down to automatic shutoff, then charge uninterrupted to 100% before normal use — this resets the reference curve to the new cell.\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-1100 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe phone's fuel gauge IC builds its percentage estimate from a stored discharge curve tied to the original cell's impedance and capacity profile. A new cell has a different internal resistance, so the IC's model no longer matches reality. The result is percentage readings that jump or stall — typically skipping fast through the middle range. One complete discharge-to-shutoff and uninterrupted recharge retrains the IC to the new cell's actual curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC still holds the old cell's curve and believes voltage headroom remains — but the new cell's open-circuit voltage under voice-call load drops below the BMS protection threshold before the display reaches 0%. The BMS cuts power to protect the cell, which looks like a random hard shutdown. Run the recalibration cycle first: discharge to automatic shutoff, then recharge fully to 4.2V. If shutdowns continue after two full cycles, check that the battery contacts in the phone are clean and making full contact.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405156483162,"sku":"BWCS-AU1100SL-1","price":26.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43405156515930,"sku":"BWCS-AU1100SL-2","price":29.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43405156548698,"sku":"BWCS-AU1100SL-3","price":31.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AU1100SL-big.webp?v=1779370315","url":"https:\/\/batteryweb.com\/products\/audiovox-cdm-1100-replacement-battery-37v-1000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}