No need to remove the battery.
Please define, wont start. Is the engine turning over and not starting or when you turn the ignition to on is the engine not turning over?
Purely guessing, it may be a poor connection issue with the battery terminals. Use a wire brush and/or sandpaper to clean up the battery terminal ends and also the terminals themselves. Then reconnect them making sure they are snug. Let us know how it goes.
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