I'd go thru maybe 6 a year of AA. I'd go thru 4 of AAA. What is the biggest multi-pack I should buy?
well.i'd actually say buy rechargeables.
Buy 4 packs as you need them.
A good alkaline battery has a shelf life of about 7 years. Still, there's no reason to buy this many. A 12 pack should be about the right quantity. A 2 year supply is ample. I'm sure you can buy more if you run short for any reason.
