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I agree with frank, if the idea is to save weight then carrying around a 2nd 30 pound battery/jumpstarter doesn't make any sense at all!
A motorcycle battery might work ok in warm weather when the battery is new but it will have limited amp output, that is where the cold cranking amp rating on a battery is useful, deep cycle golf cart batteries for example can put out sustained amps but they are limited to about 600 peek amps, put an amp meter on them and short them out with a solid copper bar and at 600 amps the voltage will start dropping down to near -0-
In the summer the amp draw of a starter is a lot lower then it even is at 40F, get down to -0- and the amp draw goes up even more and at that point a motorcycle battery will not work even if it is brand new.
If you over charge/undercharge lithium batteries you will destroy them, I don't know of any lithium batteries (without a battery management system) that you can over charge or drain way down, so altho you can put huge loads on them they are still sensitive.
Capacitors might be the solution, there are people who have replaced their lead acid battery all together with a big capacitor and have it last a few days before it goes dead, add a solar panel and it will stay charged outside forever, or pair it up with a small motorcycle battery and it will stay charged for months, then add the solar panel and you can park it in the garage too!
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