I’m slowly switching to rechargeable ones (Ikea Ladda ones), but we still have lots of other batteries around.

Do you have a favourite device to test them with? Ideally it could test many different types (regular, coin), but I’m ok with just AA/AAA if there is a cheap/reliable option.

When I did a search just now, I saw recommendations both for and against multimeters/voltmeters. Some said it was easier, and others said that it wasn’t accurate because of testing under load.

Thanks :)