jump to start..... every time!
1. Make sure the battery is charged up, AND check your running charging voltage at the battery.
If the battery can be opened, check the water level.
2 Take the battery somewhere that has a "carbon pile" battery load tester. These are a big tester with a huge resistor inside that loads the battery. If the pimply faced teenager comes out with a pocket tester, go somewhere else
Load tester: