Bought on Monday 24th January 2011, arrived the next day. As usual, excellent service. The battery itself is made to a very high standard and works with all existing 510 atomizers, as well as the new tank system being offered by others. Pressing the button to activate the battery reveals a blue light to let you know that the battery is functioning. Using a fast charger, it takes just an hour to get it back to 100% charge. Once delivered, the battery was already charged and ready to go, straight from the envelope! My next purchase will be the larger capacity battery which I will be purchasing in the not too distant future. Well done ecigsoutlet!