Compatible with the battery part numbers:IA1TA16A0, IA1W721H2, IA1T923A0, GA1W918A2, IA1W416A2. Fit to the device models:Palm M550, TUNGSTEN T1, TUNGSTEN T2, TUNGSTEN T3, Zire 31, Zire 71, Zire 72, Zire 72s.
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