So I discovered something really interesting. First off I have the Power-Pole charge and so far its a great product. I have it paired with a pair of Dakota Lithium's and a group 31 AGM for the main engine. So here is what I found out. If you have to bring a lithium awake and use an external charger as per Dakota Lithium, if you don't disconnect the battery terminals, the Charge will see this extra charge as some sort of imbalance and draw the main battery to almost empty. I noticed this situation over the weekend and luckily I was able to disconnect before damaging the main battery. So just a heads up.I was able to repeat this situation so it was not a fluke. Overall great product and works well.