That actually should read battery PACKS, not trays...as there is a big difference. Thanks, --Forrest Sent from my AT&T iPhone 4 On May 1, 2012, at 8:57 AM, Forrest <newtonphoenix at mindspring.com> wrote: > I only use the AC adapter to recharge the NiMH battery tray(s) that I use within the Newton....