You need to Load Test the battery to see if it is holding good charge.
A very inexpensive tester is avaialable at Harbor Freight.
Zero knowledge needed to run it.
www.harborfreight.com
A very inexpensive tester is avaialable at Harbor Freight.
Zero knowledge needed to run it.

100 Amp, 6/12V Battery Load Tester
Amazing deals on this 100 Amp 6/12V Battery Load Tester at Harbor Freight. Quality tools & low prices.