There are times I forget to charge my mods at night so I end up tethered to a backup battery for about a 1/4 of the day. So I'm building a fast charge mod. Right now I'm waiting on my 2.2Ah battery, the specifications of the battery for charging is 2.2amp, max is 11amps. It's a venom 15c (33A) drain. I'm hoping to have the battery this week and should have more information and pics by the end of this weekend. The 3s board has charge and discharge protection. I'm going to try a 12V 10A power supply and see if it trips the board on changing it. 7A is what trips the board on discharge but now sure on charging it though.