This charger is pretty good for the price compared to other products like the 30 dollar seidio battery charger it takes about 10 hours to charge the regular battery that came with my evo and about 15 for my seidio extended battery it actually made the stock battery for my evo last about 30 hours simply run the stock battery down to 10 then put it in the charger and plug it in and in about 10 hours the battery charger light would go from red to blue indicating a full charge and boom my stock battery went from giving me 1015 hours with a task killer to more then 24 hours with average usage cant wait to see how long my extended battery is gonna last from using this charger this has a folding ac plug making it great for putting in a laptop bag