I have another quick question on these new big batteries...now I know they come with a usb passthrough cord, now can I charge these with this cord or is it just for using while plugged in? Also are you able to buy a wall outlet plug for these to charge in the wall? I didn't know if the wall outlet plugs SI sells will charge these big batteries or not. and are these big batteries adaptable with the car charger too? sorry for all the questions..lol