I have three batteries for each of my two DSLRs - unfortunatley, they take different batteries. I always carry a spare in the camera case, and keep an extra one at home. When we travel (vacation), I take all three batteries with me - just in case. For my P&S, I only have two batteries since I don't use this camera as much. While on the subject of batteries, I want to add that I use 4 AA batteries in my flash. I have several Eveready batteries and some Panasonic rechargeables. I must say that the Eveready rechargeables are "TERRIBLE". They don't hold a charge when not used for a few weeks. I've had serveral go completely dead. Recently, I bought several Sanyo Enerloop batteries because the ratings indicate they should hold 85% of their charge for one year even of not used during that time. I just thought I would mention this.