my 5s a123 pack shot?

[glassdoctor]

Maybe true. Are you on rcgroups btw?

Well...it may not get a 100% charge, but 3.6v x 4= 14.4 and my vehicle system runs at 14.5-14.7 so I think it's getting a pretty good charge. Some vehicles (alternators) may run a little lower voltage though. Even going by 3.7v/cell it's getting pretty close.

Anyway... the idea for this application is to keep it charged all the time... and charge quickly and easily. So far it's been pretty cool.

[BrianG]

Originally Posted by glassdoctor

The only bad part is that if my 123 pack is fully charged, and I leave it plugged in with the engine off... it's probably discharging back into the car battery. So I only plug it when while driving

If your cig lighter circuit turns off when you shut the car off, then it won't back feed into your car battery. However, even if this was true, that pack could still be powering your radio and other accessories.