JR x9303 with 3s Lipo power

Yes, you could just install the 3s lipo and run your x9303. However the voltage will be about 1.5 volts higher than the stock setup (fully charged) and you run the risk of over heating the internal voltage regulator and having the transmitter shut down unexpectantly. (wow would that suck!)

To solve this problem, I copied what others have done, I installed two diodes in series with the battery. Each diode drops 0.7 volts, for a total battery voltage reduction of 1.4v. End result is a fully charge lipo @ 12.6 volts appears to the transmitter as as 11.2 volts. This is equivalent to a fully charged 8 cell NiMH battery at 1.4 volts per cell.

Category:

Entertainment

Tags:

• JR
• 9303
• Lipo
• Diode
• voltage
• drop
• James
• Lerch

[JlerchTampa]

I very carefully selected these diodes off a junk amplifier I had in my "spares" pile :-) They are UF4003

Most any 1 amp diode will do, just make sure the specs for it say its forward voltage is somewhere around 0.7 volts at 0.1amps.. Higher is better

Also, I've been told the AA "Already Charged" NiMH rechargeable batteries are the real way to go. No Harm with this mod, as long as you never accidentally leave the Tx turned on, then you will kill your Lipo forever! NiMH, not so much...

[staticxmako]

if you leave this pluged in BUT THE TX IS OFFFF and you just leave it pluged in all the time is it safe

and arent the diodes just for the c rating like if its a 30c lipo the diodes will limit the c to 1 amp?

[thankallahalltime]

thenoblequran (Ctrl+Enter)

[TAKTEZ]

Is this absolutely neccesary to do? I have a 9303, a 9XII here in Aus and bloke at LHS told me another guy that works there had a lipo in his and he hasnt had to charge it in 4 months! So of course I went and bought one... but now im worried. :(

[obsequeiousphil]

good mod,

Any info on what diodes you used and how to install the diodes? I want to do the same mod on my DSX7 radio