Can I connect a Lithium ion battery battery pack with a Lead acid battery bank; in series. I will charge both separately cells strings separately (not to mix the chemistries) before putting them in series and will use it just once to start a vehicle and drive it back to garage.
Each Lithium ion battery(LFP) cell is 3.2 V and 105Ah in capacity
–> 3 in parallel is 315Ah and
–>30 in series will 96V for the Lithium ion pack.
And Lead Acid bank is 12V and 100Ah.
Is there any fundamental disadvantage to this solution?