RE: New SPEKTRUM 9100 RX with dual batteries
I played around with a selection of batteries. They both should be the same.
The 2-cell LIPOS worked the RX just fine but were too much voltage for the regular and digital servos. I would suggest that a pair of 5-cell NiMH's would be a good choice for normal operation.
You could unplug either of the two packs and the system kept on trucking with narry a glitch.
This RX may be a bit ahead of its time as regards servos that run on 7.4 plus volts. There is an expensive fan-cooled LIPO regulator (You will need two - one for each LIPO) that you can use with the current servos out there.
Until then I would use two MPI switches between the RX and the batteries (One each). Then they can be individually charged and the RX supply turned off when not in use. You stilll get good redundancy from the two packs if a switch fails.
Regards,
Eric.