Ok, I've set up my charging system, as follows: + and - battery terminals, with a wire going to where the microusb was. Mounted there is a male 2mm connection (taken from my old e71). This then allows a female 2mm plug to be plugged in, which is then plugged into my external battery charger. Works for the most part. The problem is that I think my charger is too smart for this kind of system. It will charge for an hour (slowly), and then stop charging. Just before it does this, it drops the voltage to 1.2v. It doesn't actually result in a positive change in battery, capacity stays the same. I have a cheapie ebay external charger coming in in the next few days, which charges at a consistent 3.7v, perhaps this will remove this problem. edit: appears to be a problem if the phone is on at the same time as it is charging. If the phone is turned off, charging the battery works normal.