Hi Vlad and the limiting factor or more correctly put, the controlling factor for charging batteries is the size of a vehicle’s alternator.
You can fit as many auxiliary batteries as you need or want, and there is no limit ( other than space to locate the battery(s)), and the size of your alternator will govern how long you will need to drive to recharge that battery capacity from flat to around 95% full.
For fastest charging, try to use a cranking type battery that has deep cycle capabilities.
The SSB HVT range of batteries are perfect for this use and the The SSB HVT-50D, a 60Ah battery, will easily fit under the seat, next to your cranking battery.
The SSB HVT-50D has a recommended retail price of $245.80
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