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choice of batteries

what battery to choose?

please advise me upon what battery to choose,

my requirments are,

Vout=6v

Iout= upto 700mA

the battery must be rechargeable, light weight. the requirments may even be met with series/parallel combinations of the batteries.

NOTE: I might use regulated outputs from solar panels for the purpose of charging this battery, so consider that too.

 

Thanks in advance.