Batteries AAA and AA
I’ve been into electronics for 40 years. The cost of batteries has had me try many different brands, and types. I use some rechargeable batteries, they are not always the best choice. For the battery sizes of AAA and AA, I look for a cost per battery of about a quarter. It is important to purchase Alkaline batteries at a minimum, don’t get the cheaper, Heavy Duty batteries. They leak more, don’t have the shelf life of an Alkaline, and product less power.