Flying domestically in the US you are not allowed to put any batteries in checked bags. I do not store my batteries with my Movi when I check it. I carry them in my carry on.
I couldn't speak for elsewhere as I havn't flown outside the US and have not looked at the rules. I mentioned it because one of the articles above mentioned fires on planes in checked bags. Perhaps referring to incidents that happened before the rules were put in place that batteries must be in carry ons.
I picked up one of these http://www.amazon.com/gp/product/B008ZKM0M8/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1. The one I recieved is black, not blue. The manual is rather horrid and it definitely feels cheeply made but it does seem to work well. Especially for discharging but also nice that it has a balance feature.