>If you can accept non-rechargeable batteries, straight
lithium is
>probably the way to go.  A lithium D-cell typically has 6
or 7 AMP hours
>of capacity at 3 volts!  Their shelf life is very good too.
But be
>prepared to pay a high price for them.
>
>Dave Mullenix
>

A  standard Alkaline D cell has a capacity of around 15 amp
hours depending on discharge rate and manufacturer. The self
discharge life is not as good as Lithium but the
manufacturers claim several years shelf life without
significant loss of capacity. Cost is far less than for
Lithium batteries. The Lithium cell has about double the
terminal voltage so the above quoted amp-hour capacity would
equate to similar energy capacities.