RE:RE:Testing and approvalsApparently that is the big issue with car battery charging it is very hard to fully charge and to go from 80-100% overheats the batteries and takes 50% of the charging time.Of course none of the manufacturers disclose that issue.Range is hugely overstated due to the inability to fully charge.Who ever develops a battery that is safe does not overheat and is easy to charge will take over the industry.There are probably 100 companies doing this research including ACDC but consumers will usually choose value over high end quality so many battery companies can get a piece of the market.