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youtubers  jeff cote here with another session of  ask bys  so we've got a fellow boater um in  michigan  and he's got a freedom 36 sailing vessel  and douglas asks jeff i have a battle  born  house battery bank of 2 100 amp hour  and a group 27 agm starter  so lithium batteries for house and  agm battery for starting circuit  challenges  how do you go about charging a lithium  battery and an agm battery  with the same alternator  so one way to do that would be a battery  combiner and a battery combiner remember  i've got tons of videos if you want to  geek out about battery combiners i  probably talk about battery combiners  more than anyone else on earth  uh you can find that but battery  combiners only share voltage  they don't manipulate voltage and a  battery isolator does not manipulate  voltage either it just shares it  but in a directional way so both a  battery isolator and a battery combiner  don't allow for different battery  chemistries to be put into  parallel because they want a different  charge profile we know that lithium  has its own charge profile right it's  almost sort of like a dietary habit some  people like lots of carbs some people  like a lot of fats  some people like protein we all have our  different preferences and batteries are  the same way  they're a little they're a little bit  like us some of them want certain  voltages otherwise don't  they're all fluctuate they all want  something different  but the key is how do you go about as a  boater to have lithium  on one side of the boat on the house and  then have an agm on the starter and how  do you get  your alternator recharge your lithium  battery the way to do this  and we're lucky are what are called dc  to dc  charging converters prime example of  that  is the orion line i like the  constellation  if i mispronounce it o r i o n  from victron and those devices allow you  to have 12 volts input  and then the 12 volt output on the other  side is actually manipulated  modified to be the right charging  voltage that you want so it's actually  going to go through a charge curve  so it's going to take an input from one  battery and it's going to modify that  voltage to give the other battery what  it needs  and the way to combine a lithium battery  with an agm battery and make sure that  both batteries get what they want  is to use and we do this all the time  when we do lithium battery banks  is to use a dc to dc charging converter  and that's how you solve that problem so  that was a great question from douglas  thanks for asking  thank you for watching this pys video if  you've got further questions  ask them down below or go on our website  to fill one of the forms  and don't forget to subscribe  and thanks for watching