Re: Electric for large Planes

Don't know what you've read, but it's wrong. I have been in the battery 
business for a long time and charge in parallel all the time. YOU DO NEED
TO 
BALANCE THE PACKS AT LEAST EVERY THIRD CHARGE CYCLE. Not balancing is what

causes a lot of packs to fail.  I use two Astro Flight Blinky balancers
when 
charging in series or parallel with two packs.


"Morgans" <jsmorgan@[EMAIL PROTECTED]
> wrote in message 
news:g7bahd$27n$1@[EMAIL PROTECTED]
>
> "Ed Cregger" <ecregger@[EMAIL PROTECTED]
> wrote
>
>> The reason I ask is because charging parallel Nicad packs is not 
>> considered good practice. The LiPoly packs must have very low and 
>> consistent internal impedances if they can withstand charging in
parallel 
>> constantly.
>
> From what reading I have done, charging in parallel is a definite no-no.

> Shoot, even charging them in series is sometimes even a problem, with
some 
> cells not getting a full charge, and others over charging.  Parallel 
> battery packs are even more difficult to keep balanced.
>
> There has been a move by some to use balancing chargers, which requires 
> that the pack have a separate lead for each cell, and the charger reads 
> each battery individually, and brings each cell to full charge.  Some 
> people counter, saying that if you use good packs and not run them at
too 
> high of an output level, and don't try to charge them too fast, there is

> little need for the fancy balancing chargers.
>
> I put a lot of stock in that for series packs, but don't know if I would

> trust parallel charging packs, in any situation.
>
> What the heck.  This all hurts my brain, too.  I would rather pour some 
> sticky liquid into a container onboard my planes, and allow a chunk of 
> metal right behind the prop make a bunch of noise and mess.  I guess
I'll 
> start some kinda' flame war, just for admitting that, though! <g>
> -- 
> Jim in NC
>