There ya go! Well, solenoid is cheaper than a battery!
On a side note, I did the same thing on my shop forklift once. The battery was getting weak and we had to put the charger on it occasionally. Well, I was in a hurry and talking on the phone while trying to hook up the charger. Yeah..... I cross connected it. Long story short, it got the battery and that was it. Went over to start it and it wouldn't do anything. I thought it was weird for as long as the charger had been on it. Then I realized what I did. Man, that battery was HOT! We've all been there!!