{"product_id":"att-401-replacement-battery-36v-1300mah-ni-mh","title":"AT\u0026T 401 Cordless Phone Replacement Battery 3.6V 1300mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAT\u0026amp;T 401 \/ 4126 \/ 24032X — 3.6V Ni-MH Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V, 1300mAh Ni-MH battery for the AT\u0026amp;T 401, 4126, 24032X, and A36 cordless phone handsets. It slots into the handset battery compartment and restores power to the unit when the original pack can no longer hold a charge. Dimensions are 50.57 x 42.47 x 14.35mm — confirm these against your existing pack before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e401 \/ 4126 \/ 24032X \/ A36 compatibility:\u003c\/strong\u003e\n    These AT\u0026amp;T handsets share the same 3.6V battery bay, connector orientation, and contact spacing. One replacement pack covers all four models without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on a cordless phone test rig. The BMS accepted charge from a standard AT\u0026amp;T base cradle without triggering a fault light, and cell voltage held steady across the full discharge curve.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge protocol for Ni-MH cordless packs:\u003c\/strong\u003e\n    After installing, seat the handset in the base and leave it for a full 16 hours before first use. Ni-MH cells shipped in partial-charge state need a slow initial charge to reach rated capacity — skipping this shortens talk time from the start.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eRange dropping after a battery swap on the AT\u0026amp;T 401\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eDECT handsets draw a sharp current spike every time the RF transmitter fires. If a Ni-MH pack hasn't been fully conditioned, internal resistance is higher than rated, and voltage sags under that transmit load. The handset interprets the voltage drop as a weak signal and reduces transmit power — which cuts range. Running three to five full charge-discharge cycles brings internal resistance down and stabilises the voltage under RF load.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBase station showing no charge or fault light with a new Ni-MH pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH batteries can sit in storage long enough for cell voltage to drop below the threshold the AT\u0026amp;T base cradle uses to detect a valid pack. When the cradle sees voltage below roughly 3.0V, it may refuse to initiate a charge cycle and show a fault or no-charge indicator instead. The fix is to briefly trickle-charge the pack externally with a universal Ni-MH charger until it reaches 3.2V or above, then return it to the base — the cradle will recognise it and resume normal charging.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43340073042010,"sku":"BWCS-P501HL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43340073074778,"sku":"BWCS-P501HL-2","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43340073107546,"sku":"BWCS-P501HL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-P501HL-1.webp?v=1778367047","url":"https:\/\/batteryweb.com\/products\/att-401-replacement-battery-36v-1300mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}