Before you give up on your vamo try doing the following:
Using isopropyl alcohol and cotton balls/qtip for cleaning
Remove the battery cap
Remove the spring from the battery cap
Clean the cap to spring contact surfaces and cap threads
Clean the spring to battery contact surface
Remove all threaded battery extension tubes (v1, v2, v4, v5 - one tube, V3 - two tubes)
Clean the battery tube threads, both internal and external
Clean the control module battery pin
Clean the 510 and ego (tank connector) threads
Reassemble and give it a vape.
Good Luck