how to not destroy an alternator when charging LI batteries.

Those tests on the PM of the none Belmar alternator are bogus because in most motorhomes the rpm of the alternator is 3 times the crank speed so at 800rpm crank speed(idle) the alternator would be doing 2400 rpm thus cooling a lot more. and when I drive down the road at 1900 rpm the alternator is doing 5700 rpm and could be putting out 165 amps. It might burn up at that amount of amps,but hasn't yet because it never reaches that.JMHO