The Broncolor Rechargeable Plug-in Lithium Battery for Mobil A2L is great a great tool for the location shooter. The thermally stabilized battery weighs half the amount of the previous lead battery and takes half the time to charge, with no memory problems. The Lithium battery also outperforms the lead battery, offering 220 full power flashes (normal charge) rather than 170 for the lead battery. And it lasts longer - a full 1,200 charges vs. the lead battery's 300 charges. The battery charges inside the A2L pack via the pack's 100-240V AC charger.