On Sat, 14 Oct 2006 19:54:50 +0200, "John Plimmer"
wrote:

I recently got a Redsun RP2100, the users view of which I previously posted
on this group.
It has the facility to use rechargeable batteries, something of which I know
nothing about.
It will charge these batteries for twelve hours.
I want to use "D" cells but don't know which rechargeables to buy.
My local store can order me NiCad's or NiMH - I don't know anything about
that.
What's the difference?

Also there are different numbers like 1500 or 2500 which seems to mean how
long they hold the charge.
I would be grateful for advice from you highly knowledgeable fella's as to
what I should buy.
As they seem to be very expensive, perhaps I should just stick to ordinary
batteries and forget about the rechargeables?
'Real' D size NiCd in the D size run about 5000mah, NiMh's in true D
size run from about 7000mah to 11000mah. 1500 or 2500 are in fact size
AA NiMh cells in a D sized battery. I would assume the charge circuit
is designed to charge a D size at several hundred Ma, although exactly
how much is apparently dependent on the voltage from the AC adapter.
IIIRC, according Lipyn's manual, voltages below 8V probably won't
charge the batteries.

I use 7000mah D size NiMH cells in mine. Give nice long run times.
However you will pay a lot more for 'real' D sized batteries than the
AA's in a D size package.