To add to the discussion I've recently got my mitts on this charger: https://hobbyking.com/en_us/hobbykin...___store=en_us

It's basically the step up but seems much better quality and has a digital readout which is pretty handy. It still needs a separate adaptor but I've always just grabbed one off ebay.

My kits come with a LiPo bag (partly for safety in shipping) so you don't need to worry about them.