I was having issues with my Shark vacuum showing charged but as soon as I turned it on, it would immediately die. I decided to try out a replacement battery but didn't want to pay the Shark price, just in case that wasn't the issue. I received this one, charged it to full and tried it out... I forgot how much power that little vacuum had! It is at least 3 years old but now it's running like new! I will definitely purchase from Batteryhawk again in the future if the need arrises.