When it comes to traveling by airplane, there are certain restrictions on the type and amount of batteries you can bring with you. Consumer-sized batteries, such as those used in cameras, are allowed in hand luggage as long as they weigh no more than 2 grams of lithium per battery. This includes all the typical non-rechargeable lithium batteries such as AA, AAA, 123, CR123A, CR1, CR2, CRV3, CR22, and 2CR5. You can bring as many of these batteries as you need for your devices. Replacement batteries must also be less than 100 watt-hours but cannot be billed. These must also be kept in your hand luggage.
It is important to note that these restrictions apply to all airlines and airports, so it is important to check with your airline before traveling.