I thought I'd do a quick demonstration while I'm using my spot welder at the moment to make up a 10s4p li-ion battery pack.

*Nickel Strips*
http://amzn.to/2j8HQvo
http://amzn.to/2jBqHhV
https://www.ebay.co.uk/itm/Solid-Pure...

*Solenoid Relay*
http://amzn.to/2j5cLc8
http://amzn.to/2j7GpNR

*Choc Block (Electrical Connector)*
http://amzn.to/2AScb90

*Copper Nails*
http://amzn.to/2hOHNbD

*Heavy Gauge Cable*
http://amzn.to/2j4Vy2G

*Momentary Switch*
http://amzn.to/2jF69Fv
http://amzn.to/2j6hfz8
http://amzn.to/2j5rLXy

12v DC Delay Relay Timer - http://www.ebay.co.uk/itm/12V-DC-Dela...
(To activate the switch that activates the solenoid, NOT to replace the solenoid.)

My Website: http://kevindark.co.uk