Super high capacity !, eGo batteries are very useful spares. They will eventually wearout, but most people do have 2 or 3 batteries, so that you're never stuck without one, whether there's one on charge, or you are out for the day and don't want it to run out, or if you just fancy a change in colour!Powerful, long lasting Diamond Mist battery range is easily deactivated / locked by pressing the button five times. Feature means that it's safe and convenient to pop into your handbag or briefcase when you want to take it on your travels. Batteries are compatible with our USB charger leads so convenient, fast charging is simple With powerful short circuit protection, this battery has a constant output for safety and features a standard 510 ego/evod thread connection which is compatible with the most popular clearomiser / tanks.