Two AA cells in a black casing with two contacts on back. 2.4 Volt NiMH Cordless Phone Battery. Fits models; AT&T 00-2421, AT&T 20-2420, AT&T 20-2431, AT&T 20-2481, AT&T 2400, AT&T 2402, AT&T 2420, AT&T 2421, AT&T 2430, AT&T 2431, AT&T 2440, AT&T 2455,...
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