I have a EB150 1500Wr unit bought in 7/2000. I don’t use it a lot (maybe like 3 times a year). Few weeks ago, I used it until it’s all out of battery but now when I charge, I can only charge up to 2 bars out of 5 bars. The unit refuses to charge to full 5 bars. I tried another 150W charger and it also does nothing. What could be the issue? I’ll try again using a 200W charger tomorrow. Thanks.