If you read the proposal I've made, you can see that it gives you the possibility to run with only 3,7 volt (one cell) if you like.
Still, I don't think 1:12 is ready yet. Only actual thing I've heard is that the cars handled poorly with the low weight.
Touring should be kinda ok... but the 5 cells (6 volt) thing is down the drain then... and they would suffer overheating problems again...
>> Complex!!! For 1:10 OR exclusively it's not!
This is my original wording in the proposal:
Amended:
Appendix 3, rule 3.3
1/10 Off-Road cars will be driven by a maximum of six cells. EFRA approved Lithium Polymer batteries may be used as an option for this class. See Appendix 10 for specifications.
NEW:
Appendix 10
LITHIUM POLYMER BATTERIES (LiPo) - SPECIFICATIONS, TESTING AND APPROVAL
And they've simply changed it to "3.11"... fishy!!!

They should have just kept it as it was, and made an EFRA executive proposal for all classes in addition if they liked. Or better: one for each class.
I hope they have enough coffee at that electrical meeting...