Connector Problem. How to conveniently connect with cell-phone LiPo batteries
The only way to connect those batteries properly is using spring loaded contacts, because you have to apply steady force to maintain low contact resistance. 

There are manufacturers out there, who make such contacts like Kitagawa. But to make it work instantly you can make a spring contact yourself. For me it works properly. My Phone's USB-connector is wrecked, so I have to load it this way:







You may add something to align battery and contacts better. A handfull of nails or screws will do fine.