Actually, I do not have the Lithium pack. If I could find one, it would be quite expensive. And lighter. The lead/acid battery works well, I don't try to get more than 100 shots out of it before recharging, but the manual says it should go longer--between 250 to over 5000 depending on the charge mode and power used. I also only use full power when shooting outdoors as a main light, so it doesn't always run full power. Plus, the lead/acid battery is a common size and readily available at 1/2 or 1/4 the price.