For those that have a mix of 24V and 12V machines, this is an unsolicited/uncompensated plug for the Kold Ban International Kranking Kart. https://www.koldban.com/KrankingKART_s/34.htm I was buying parts to repair the ether injection on my brooms, as 2 out of the 4 systems were inop, and noticed they had a predecessor to this device. I have many 24v machines, and it is a pain when the batteries are dead, as generally there isn't another 24V machine handy to use as a jumping source. I called to buy one, and they informed me that while they would sell me one, they were coming out with a version with next-generation capacitors. I waited, and got one. I finally got to use it last week. One of my articulated trucks had a dead battery where it was parked in the middle of a field when I went to get it to put a plow on it. It was so dead not even the dash lights came on, and it was about 25F. Normally, I would have pulled out the batteries, taken them inside, charged them, reinstalled, and started, delaying things by half a day in total. This time, I set the KrankingKart up as a 12V, charged it from my Subaru for 45 seconds or so, switched to 24V, carried it to the truck (it only weighs about 40 lb) hooked it to the truck and it started on the second crank. I give it 2 thumbs up. It says it's for engines up to 8 liters, but it cranked the Scania DS9 easily. It only gives 15 or 20 seconds of cranking, but if your engine doesn't start in that time, it probably won't start anyway. It wasn't cheap, at $1800, but it only needs to help out a dozen or so times before it's paid for itself in aggravation (at least to me). As a bonus, you can use it for 6V machines as well...Discharge it through a headlight, put it on 24V, charge it on the 24V setting while hooked up to a 12V source, change it to a 12V setting, which will give you 6V for cranking. I checked with Kold Ban and they indicated that it was perfectly acceptable to do that.