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I think the most likely culprit is your battery. The only positive way to test it is under load, and few places have *real* load testers anymore... it's just easier to sell you a new battery. Your battery could indicate fully charged but have nowhere near its original current capacity. This is even more likely if it is a "maintenance free" battery.
Nonetheless, it's always good to check the basics, so look at the cables and battery terminals to make sure they are in good shape and free of corrosion. If your battery is 5 or more years old, consider a replacement.
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