I switched from the D2/E9 batteries over to the 808D1 from Bloog recently. I then purchased an XL from another supplier. I have to say that the KR808D-1 automatic battery that I purchased from Bloog has out performed all the D2's & the new XL I bought. It lasted all day at work and only lost a little charge. After fighting with the E9's for months, I am so happy be using the 808D1 now & am very happy with the performance of my Bloog batteries. I also like the RY4 cartos I got from Bloog. I only wish they sold them in higher nic content and offered ejuice so they would be a 1 stop shop for me.