In article ,
The Medway Handyman wrote:
You can do. FWIW though 4x AA batteries cost about the same and hold a
lot more charge. PP3s are especialy bad deals in terms of energy per
cost. And C cells are much better than AAs...

I've often wondered about that - what are the crireia when designing a
torch, kids toy, whatever as to which size & number of batteries are
best?

In general the smaller the battery the larger the cost per amp hour -
although economy of scale comes into this too. But perhaps the worst is
AAA against AA - they're often the same price despite being about half the
capacity. PP3s use 6 AAAA - not a common size on its own so difficult to
compare.

--
*El nino made me do it

Dave Plowman London SW
To e-mail, change noise into sound.