Something that has been bothering me for a while. We've seen that power batteries do not necessarily have to look the same ( Indigo tribe and Kyle's battery). In the last issue of New Guardians Kyle even mentions the Indigo tribe never has to worry about running out of energy. My question is have the writers ever touched upon the problem of Green Lanterns running out of energy? We've seen the whole pocket dimension thing a few times but I don't remember it having been used in battle. That aside why hasn't something just made a battery that is a back pack, watch or belt? Would be nice for at least an explanation as to why this hasn't been tried, even if it's a lame excuse like the power batteries can't be shaken like old school CD players.