Timex Ironman

Luis wants me to use a heart rate monitor and run within zones. A couple of years ago I purchased a Timex Iron man GPS & heart rate watch. I used it once but then kept forgetting to charge it. I found the watch and HR strap but no charger. I ran Thursday but just had to go a mile then walk to check the rate, then back to running. Not the same thing he wanted but it appears difficult to reorder just a charger. I don't want to spend another $180 when I could spend $10. Going to keep looking. I'm supposed to run 30 minutes today as well.