Airborne batteries

[Chris Moon]

Bob:
    I have been running 5 cell 1650 Nimh for the last 2 yrs (NoBs brand 
from Hangtime Hobbies) and they have been excellent.  I ran them w/ 
Jaccio 5.7V regulators.  Be careful with peak chargers though as some 
cheaper ones don't relaibly detect peak and will cook the packs if you 
are not monitoring it. - cooked 2 packs w/ a Hobbico fast field charger 
MkII.  In August, I switched to Li-ion 2400 packs from Fromeco.  (same 
Jaccio regulator).  More capacity and less weight.  I have no empirical 
evidence, but I believe the airplane just "locks" better and stops more 
reliably in snaps and spins.  Apparently the voltage drop w/ the NiMh 
was enough to affect the servos' holding power.  I used a Triton to 
charge the Li-ion pack and just got a Fromeco charger to charge multiple 
Li-ions at once -for my big gasser to charge my 2 packs at the same time.

Chris

Bob Richards wrote:

> Guys,
>  
> I'm needing to replace several nicad airborne packs for my radios (as 
> well as a couple of transmitter packs). I'm wondering what has changed 
> in the technology in the past 8 years.
>  
> NiMh packs had just hit the market about 10 years ago, and as I recall 
> it seemed that they did not stand up well to vibration - several 
> inflight failures being reported. Seemed they were ok for 
> transmitters. Has that changed?
>  
> I know Li-ion and Li-poly are now available, but what type of charging 
> apparatus am I looking at investing in? I also think I need to use a 
> regulator with these?
>  
> I don't presently have a fast field charger and would like to have 
> one, is there one that covers all the above bases?
>  
> Thanks in advance,
>  
> Bob Richards.


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