Cautions
Li-Ion Batteries may explode if charged or discharged improperly.
You must possess knowledge of electronic and understand hot to handle Li-ion battery. 
We reserve the right not to sell and void the warranty it you don"t meet the above statement.
Never solder directly onto the Li-ion battery as overheat might cause battery to explode.
If you are making a pack or need to solder batteries together, you need to get battery with tabs on it.
You will solder to tabs instead directly onto the battery.
Please read more safety warning about Li-ion battery.