Electric current in Botswana is 220/240V.
Most electrical outlets require South African style (three large round pin) plugs. Some safari camps have UK-style (three square pin) or European-style (two round pin) outlets but this is relatively rare. Many camps do keep a small number of adaptors on hand, but there aren't very many of them and they tend to be for US appliances only -- if being able to charge your appliances is important it's advisable to bring your own.
If you are coming from the US and want to see whether your appliance will need a convertor (to step down the voltage) as well as an adaptor (to fit the local outlets) take a look at your appliance's AC adaptor. If it shows that the appliance can accept 220/240V then you will only need an adaptor -- if it only takes 120V you'll need a convertor as well as an adaptor. Fortunately most modern appliances can accept 220/240V current.
Note that many safari camps do not have 24-hour electricity, so you will need to account for this when deciding how many batteries to bring for your cameras and other equipment. Many people bring three sets of batteries -- one in the camera, one fully charged spare, and one to leave in camp to charge (in many camps the generator is only run when you are out of camp on your game drive). If your item has good power saving settings you could get away with two, but few things are as heartbreaking as having your camera die just as the animal sighting of a lifetime occurs.