Poor battery connection at the post is quite common.
Excessive high resistance will limit / prevent current flow.
My guess is due to the poor connection, when attempting to start the car would cause an arc and break what little contact you had.
By removing the terminal and reattaching (without cleaning ) you managed to gain a slightly better connection that would ultimately fail again.
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- 1990 Mazda MX-5 Miata – Complete power loss on crank