eGo-T 900mah LCD Battery. 

900mah capacity provides long life between charges.

With this battery there is no more worrying about how long before the battery dies.  The LCD readout shows battery life remaining as well as the number of puffs taken on current charge.

eGo Battery is not compatible with 510 Charger.  Charger output must be DC 4.2V  420mA

This battery has a DOA warranty only