I bought a USB battery a few years ago. It was a great battery and still in service in my riding mower. It started slipping down to 12.5 volts, so I decided to buy new. I bought a green Apex battery on the cheap,after being told they were the same as the USB.. It wouldn't crank well. I replaced my original starter with a 4 brush, no change. I got a replacement from Apex. The replacement wasn't any better. Christian had the same issue. Under load, they fail fast. If the bikes didn't start up right away, there were no second chances. I've put a new starter clutch in thanks to the Apex. Some people whose opinions I do value, have had no problem. The second Apex does bench duty as a power source. It was holding 12.3 volts last I checked. Just saying.