I've actually thought this myself quite a bit lately. I can shoot more than adequately, so taking game is no issue; but what to do with it once I've taken it is. I've never in my life eaten an animal I've killed; generally I only shoot nusiance animals like coons and cats, anyway. I hate stray cats. I'll have to watch some youtube vids and try to do it myself, at least to develop some basic techniques.
Alienpi is right - if a battery is completely dead, you almost need to give it a boost first. Maybe leave it hooked up to a running vehicle (monitored of course) via jumper cables for a few minutes just to let the more powerful charging system help out. We used to do this when an automotie battery was doornail dead. Just don't go boil an egg while this is going on - you need to be there to watch both batteries to make sure they don't pop.