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I saw a review of some of these on ProjectFarm on youtube. I don't think any of them live up to their amperage claims, but the bigger ones of better brands did manage to turn a truck engine over even when cold.
I never see it talked about, but using INPA has a State of Health value under the IBS menu. It's starts at something like 3.xx% and rises from there. Mine is at about 12% at about 3.5 years old. I'm not sure what how that SOH compares to % remaining capacity, but the IBS is gathering enough information to estimate that. If that's the case, then good quality lead acid batteries are normally pretty reliable down to 50% capacity. I'll probably replace replace with the SOC rises to 40% or so so there's some margin for cold weather.
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