Wiley1, after I installed my 4 gel cell batteries I had to put a cut off switch between the engine battery and the coach batteries, because the engine battery is a lead/acid there is a chance that the alternator will over heat the Gel Cells an cause them to split open, so I bought a DC to DC charger, it is powered by the engine battery an has the settings for the Gel Cell, AGM and Lithium, it also has a heat sensor to attach to the coach battery to prevent overheating, if I ever need to do the emergency start I just close the cut off switch and then use the rocker switch on the dash to tie the engine battery to the coach battery, I bought mine from Renogy and they have different amp ratings, its been in for over a year and has been trouble free
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