On 22 Apr, 14:13, "kirk.stant" wrote:
Buy the biggest you can fit!

Powersonic has a 9 AH in same format as 7.2

Then add more batteries, they are cheap, lost instruments are
dangerous, lost OLC logs are maddening!

From experience.... now running 3 batteries..... saves me adding water
ballast! ;-)

Bob

AMEN!

My solution was to split the cockpit into two electrical busses, each
with it's own 9AH battery. Either side can fail and I have enough
"stuff" to get home (or finish a race...). Can also gang the busses
so either battery can power all the cockpit.

I have 3 batteries, one is always on the charger, and rotate the ones
from the flight every evening - so I always have 2 fully charged
batteries every flight. No special connectors on the batteries, so
any standard size 7 - 9 AH "brick" with spade connectors will fit, if
necessary.

It's worked so far (8 years and counting...).

I see there are some new technology batteries coming on the market for
gliders (in S&G?) - maybe we are about to move on from our beloved
lead bricks!

Kirk
66

I replaced my lead acid 7 ah brick with a NiMh pack made up by a
supplier. The result is a pack that fits into the same battery holder
slot, is 30% lower in height, 50% lighter, runs at 14v nominal and
has a 9 Ah capacity. It was so succesfull that I replaced the second
15 ah battery used to raise and lower the turbo with a similar pack
but of only 12ah but saving 7kg.

One other advantage is that they use a purpose built microprocessor
controlled charger that ensures they are fully charged and ready to go
even when left permanently connected.