I strongly recommend this product I am very disappointed. Possessor of an Electronic Cigarette eGo CE4 with an original battery 650mA, I ordered this battery of 900 mA to have a replacement that would last more than a day. Unfortunately this is very bad. After a full charge, the battery takes 4 or 5 hours vapotage while the original battery (that's less powerful in theory) takes about 20 hours. It borders the scam.