The new compact and rechargeable Li-ion Battery Pack LP-EL delivers the power and reliability needed when shooting any situation - especially weddings when a moment can be once-in-a-lifetime, so you can feel comfortable shooting over and over for extended periods of time. You can even view the remaining battery level in the top right display of the Speedlite EL-1 letting you know just how long you can go or when it's time to recharge with the LC-E6 battery charger.