Please excuse this question if it seem somewhat naive. I have a 1987 vintage 48 volt Clarke e;ectric forklift that has been sitting for over a year without charging the battery. The battery only shows 7 volts (let me guess, not good). Before the forklift was put into storage, there was a problem, sometimes it ran sometimes it did not. In order to get a technician to look at it, I was told t he battery had to be fully charged. I'm not sure if the battery can still be charged. I don't want to lay out a lot of money for a replacement battery before I make sure the forklift is worth fixing. My question is this: Could I use 4-12 volt car batteries in series to temporarily power up the forklift in order for the tech to troubleshoot it? Also, can you operate the forklift with the same 4 batteries for short periods (5 minutes max.)? Thank you. Mitch