The main benefit is that it lasts longer and you can set the supply voltage respectively to get stronger or weaker effect.
1100mAh battery lasts about a day at different voltages.
Has four markings to indicate approximate output voltages of 3.3, 3.8, 4.3 and 4.8 volts, but is adjustable in the whole power range.
Has the same diameter as standard 650 mah batteries, but is slightly longer and easier to hold.
Short Circuit Protection: If a short circuit occurs then the battery will shut down. The battery will not work again until short circuit disappears. 10 seconds cut-off (if you hold the button for 10 seconds, battery will shut down) Low Voltage Protection: When the battery voltage is lower than 3.3V, the battery will shut down. Size: Length 112mm / Diameter 17mm