MyFishFinder.com Just like iceshanty but warmer
I have made my own 12vdc converter, it has a 3amp output and I use it to power all of my 12vdc things. Also I have dewalt batts. And the dewalt USB charging adapter that I use for my cell phone and tablet. The 5amphr batts that have run my vex. For a couple of days no problems yet.
You can use ohms law to get a quick comparison for them. volts x ah = watt hours so 12v 9ah sla is equal to 108 watt hours But lead acid batteries should only be discharged to 50% of capacity.Most lithium you can use 100% of rated capacity so lets say you have a 20v 5ah drill battery that would be 100 wh