Or just buy another I2, that would charge faster at 500 mAh. I4 does 4 @ 375 mAh.
Well it's just 1 battery Evic VTC Mini but I'd always be charging if I only charged one at a time. Basically as-is by the time 2 are charged my 3rd is almost dead so really only have 1 before I need to charge 2 again. If I could charge 4 I'd have 3 before I'd have to charge and use 4th(5th battery) while they charge. If that makes any sense lol. Charge every 2 days instead of everyday.What mod are you using? The I4 does 750 for two batteries. All I use is dual battery boxes so I'm never charging more than two batteries at a tiime.
Of course I only use 1 mod at a time though.
What are you trying to achieve in a new purchase?