RE: Wren 54 upgrade ecu battery question
A 3300nimh pack will have no problem supplying the amperage you need.
I use a 3700 pack on mine.
Before lipo's were around, we pulled 50+ amps from those packs flying fast edf's. I think Wren's policy addresses smaller, older generation packs from years ago.
If the pack is in good working order it will do the job...........
gregg