{"product_id":"cobra-2130139001-replacement-battery-36v-600mah-ni-mh","title":"Cobra 2130139001 Cordless Phone Replacement Battery 3.6V 600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCobra 2130139001 \/ AN8525 \/ AN8526 \/ AN8591 Series — 3.6V Ni-MH Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V, 600mAh Ni-MH replacement battery for Cobra cordless phone models including 2130139001, AN8525, AN8526, and AN8591, among others. It slots into the handset where the original pack sits and restores full talk and standby operation. Voltage and capacity match OEM spec exactly — no modification needed.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAN8525 \/ AN8526 \/ AN8591 and 2130139001 compatibility:\u003c\/strong\u003e\n    These Cobra handsets share the same 3.6V three-cell NiMH pack format, identical connector pinout, and the same physical footprint — 40 × 42 × 13.5mm. The base station charges through the same contact pair across all listed models, so one pack covers the full range.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack on a Cobra DECT handset and confirmed the base station accepted the charge handshake without error. The BMS held voltage through both talk and standby draw without dropping below the low-battery threshold prematurely.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge conditioning for NiMH handsets:\u003c\/strong\u003e\n    After installing, seat the handset in the base and leave it for a full 16 hours before first use. NiMH cells in cordless phones need a slow initial charge to reach rated capacity — skipping this is the main reason users report short talk time after a swap.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBase station showing a charging error after fitting a new NiMH pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eCobra base stations check for a minimum voltage threshold when the handset is docked. A new NiMH pack fresh from storage can sit at 3.0V or lower — below what the base expects before it begins a charge cycle. Some units interpret this as a faulty battery and flash an error light instead of charging. The fix is to place the handset in the base and leave it — most Cobra chargers will eventually begin a trickle charge after a short timeout, recovering the pack voltage to an acceptable level.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eRange dropping noticeably in rooms that were fine with the old battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eCordless DECT handsets draw a spike of current each time the RF transmitter fires. If a NiMH cell is not yet conditioned, its internal resistance is higher, and voltage sags briefly under that transmit load. The handset reads the sag as low battery and reduces transmit power to protect the pack — cutting range as a result. Run three to five full charge-and-use cycles and internal resistance drops, voltage holds steadier under RF load, and range returns to normal.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43340111708250,"sku":"BWCS-P302CL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43340111741018,"sku":"BWCS-P302CL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43340111773786,"sku":"BWCS-P302CL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-P302CL_1.webp?v=1778367188","url":"https:\/\/batteryweb.com\/products\/cobra-2130139001-replacement-battery-36v-600mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}