Ok so with that said. I am looking at running dual lipos in my SCX10. I was wanting to run dual 2s lipos. Do i run them in tandem and will that make me a 4s? if it will work then will i need a ESC that handles 4s lipos?
"In tandem" isn't really an accurate wording in this case, as it doesn't really denote hooking them up in series or parallel. If you parallel them (batt A&B pos to ESC+, batt A&B neg to ESC-), then you'll still be at 2S but you'd add up the mAh, and have nice, long runtimes. Considering the low voltage of this setup, I'd be very surprised if a stock truck had a problem running like this.
To run series, (batt A pos to ESC+, batt A neg to batt B pos, batt B neg to ESC-) you'd then be at 4S, not adding together the mAh. Lots of voltage, good ground speed, so-so runtimes. Better make absolutely certain the ESC you're going to use is rated for 4S, or your shake-n-bake will turn into sizzle-n-smoke in a hurry.
In parallel, both batteries need to be identical in every rating.
In series, you can mix voltages, but everthing else must match exactly. (mAh, C rating) And it would be very wise to make sure if you're mixing batteries, they come from the same mfr, so the ratings are tested the same and should be a known match. This is one area where mix-n-match makes for very bad karma.
