had a quick nose on the wrongo website and see its side by side 2s, tbh if your doing what i think, (please clarify) but i guess you gonna stick a set of saddle packs in each battery tray, if this is the case you will need to charge the saddle pack (as a 7.4v 2s) separately so you can balance them as normal, just be aware of your wiring, you will need to wire them as a 7.4 pack but then link them to get 14.8v.
An excellent economical way of not having to buy more batteries, but just be wary of rushing whilst trackside changing batteries!!
