Eachbid 1pc Li-ion 1x 18650 DIY Battery Box Holder Case 1# They are made to mount onto a PCB and have a couple of small tabs running from the contacts through the base This battery case is Diy box, can not be used directly. You need welding according to demond Battery type: 1x 18650 3.7v Pin Number : 2 Size: 7.8cm x 2.1cm x 2.5cm - 3.07inch x 0.83inch x 0.98inch