Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
The battery is most likely to be defective, at 1 1/2 years old.
That is also definitely out of GolfBuddy's warranty period.
The battery for your VS4 model is here:
and that offer may not be quite the cheapest, but it includes apprpriate tools to open the GolfBuddy with, should you need such tools and not have them already.
Here are two other choices:
which includes tools... and then
which is cheapest but does not include tools.
Good luck with the replacement. I hope it's all it needs, and it should be all it needs.
If this answers your question, please rate my answer. A five-star rating would be appreciated!
If you need more info, or have any comments, use Reply To Expert to respond.