Even if there wasn't a need to have a battery as a buffer for the alternator, these vehicles' alternators don't have their huge output capacity for no reason so the battery would soon be flat only being supplied with 50A.
MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi
If your RRS is the D3 version then while it has a SMART alternator, the D3 alternator never operates below 13.4v, which is fine for lithium battery use.
If you have the D4 ( or later ) version of the RRS, then you will have potential problems on long trips.
The Lithium cranking battery will be fine around town as you will be able to get a reasonable charge in to it because of the short driving, where the alternator gives a high voltage "burst" directly after each start.
But any trip of 2 hours or more risks flattening the battery.
This is a double problem in that if the battery gets to low, it will turn off, and that in itself can be a problem with many of the lithiums on the market require a jump start from another battery to turn them back on.
But you also have a far more serious potential problem, if the battery gets so low that it turns off while you are driving.
This situation can lead to damaged vehicle electronics.
Even the hybrid vehicle manufacturers, where they have lithium storage batteries to drive the vehicle and a small motor to charge them. The motors starting battery is still a lead acid battery.
They just don't trust lithium batteries as start batteries.
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