So, "a friend of mine" accidently put a reverse charge on his JR transmitter by plugging it up to a Futaba charger. After an all night reverse charge, the mistake was realized and the battery pack actually read over 7 volts in reverse polarity!

The question now is, is the battery pack junk? Also, any chance the transmitter was damaged by this mistake?

Learning something new every day,

Flying Fever

how did that happen when there wired the same???i think all he did was charge the pack...i use a jr pack on my futaba rx with no problem...just don't plug directly into the rx...

john

JR's charge jack is reverse polarity as compared to a Futaba!

I'd don't think I'd chance it, $40.00 for a new TX pack is cheap insurance and will allow you to sleep well.

Consider your TX pack completely ruined.

You can get an Expert Battery Pack for it. They are 1500mah NIMH and they cost about $35.00 at the LHS or Tower.

Thats cheap considering the risks involved with flying a plane with that battery now.

If you have access to a battery cycler, charge it in the proper direction for at least 16 hours and then run a discharge curve. Do this twice or three times. If the battery is withing 80 % of it's origingal capacity, you are probably okay. If you did not cause the battery to heat up a lot or build up enough pressure internally to blow the seal, you may be able to continue using them but; to be safe, I'd put in a new set of cells. PS, you must have modified your transmitter (bypassed the diode) or this could not have happened. Now you know why the diode is there.