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Re: pic: Portable Power Pack for Operator Interface
May I reccamend a Rechargeable set of 6 AA batteries with a 6 cell holder (available at Radio Shack or Digikey), wired the same but uses only one 9 Volt clip. that way you could use a charger to charge the individual AA batteries and use then elsewhere and they'll typically last much longer than the 9 Volt. but less weight compared to 6 D size.
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