Mark A. Lopez Sr.
1 of 2 people found the following review helpful.
I used the GB40 to boost my Motorcycle Battery, the first boost went great no issues. The problem was it drained the GB40 Boost to half. The same day I used it again, 30 minutes later, it started my battery once again, but this time the error led illuminated and never went away. I cannot charge GB40, turn it on, or do anything with it. Not happy with this product.Report Abuse