If it heats up well enough, it should be reading the full battery voltage, do you have a voltmeter? You could try charging it to green, then open it up to see if it went to the full 4.2v
The other thing is, you mentioned your battery was low when you first got it, if it was too low it might have been damaged, but you should notice that it wouldn't last as long between charges. Does it spend most of the time on yellow or red?
not sure yet, haven't got enough time to test it, however when it was soldered in it charged up to green when shaken on the first try.
also, i don't have a voltmeter. i will continue using it without charging it up throughout the day and see how long it stays on yellow/red for.
in either case, if the battery is damaged it doesn't matter because i've ordered a couple NCR18650B's off ebay, they were extremely fucking expensive and claim to be "new", easy to get my money back if they have been used
so i'll know in a few days when i get the batteries whether or not its my wiring or the battery, or something else completely unrelated. or maybe a couple weeks.... pretty sure the batteries are coming from somewhere in europe/asia. doesn't matter though, i'll have a brand new cobalt pax to play with tomorrow, so theres that to look forward to
edit: come to think about it, the battery life when soldered in was quite poor. in fact yesterday it went from green to yellow in the same amount of time it took for the stock 2600mAh battery to go yellow, then once it was red it died within 2 sessions for a grand total of like ~50 minutes of usage.
after 2 good long sessions battery still showing as yellow, i think i'm just gonna go buy a cheap voltmeter from lowes....
edit 2:
battery showing as red now, in order to rule out the battery as being the problem i'm going to put in the stock battery and charge it up.