Peter Soro

Hi, I have had the same problem but with a 54/60v grinder. The trigger failed and shorted out my battery, now the batteries are only able to be used on 18/20v. I opened the battery and found a fusable link to be blown. I soldered I piece of wire back in the place of the link and the battery work again on 54v. If you are going to do this, note that you are bypassing the safety feature of the battery and if there is a fault in one of your tools again it will not blow the fuse but possibly overheat the battery and run the risk of melting or exploding. Hope this helps.