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aj98 - the problem with your Blazer may be the starter, not the battery if your electrical connections to the battery are clean and tight.
Do you have other electrical power when the starter fails to turn over -like lights? Or does the radio turn on when the key is on?
It could also be a bad ignition switch if the lights work and nothing else does.
I have a Genius Boost 400A lithium battery booster that I keep in the small compartment in the trunk if I go on a long trip. Very small and surprisingly powerful.
And a separate small 12v air compressor and plug kit that have never been used.