[villagetinker]

I agree, probably a bad battery, there are 2 bolts, one toward the front of the cart that you will need a long extension on your ratchet to get it out and one towards the back, these will release the barrier enough the get the battery out. NOTE the position of the positive and negative battery posts. Got to your local automotive battery supplier, have the battery tested, and get a new battery. Note some store have 1, 2, and 3 year warranty batteries, I typically get the 3 year warranty. When you reinstall the new battery make sure the battery posts are in the correct locations.
On a side note some Yamaha golf carts do not charge the batteries correctly there is a post in the DIY area to fix this, and many of the Stryker units were wired to be constantly ON which causes a significant drain on the battery. There is a fix for this that changes the power supply connection from the normally ON to the SWITCHED supply from the ignition (master) switch. This means you may have a 30 second delay until the unit is up and running.