Hi there, I have a Raymond EASI 4D R45TT. My forklift battery percentage changes all the time. At one point, it shows 100% after it is charged, and when I turn it of, it goes to 7%. When I turn it back on it goes to 90, do the same thing and will then show 57 for example or even 0 (and then back to a random number). I even unplug it and plug the batteries back in. I can drive it for some time too. After I fully charged it, I checked the voltage of the leads on the battery and it showed 36.9V (it's a 36v battery). And suggestions to fix this Issue or could it be the battery. Thanks so much