I’m trying to find out what the performance specs on Sam’s Club Member’s Mark batteries is–the best I’ve got so far is some hearsay from a forum post about them being made by Duracell.

BUT, in my search I found a post discussing rechargables vs. alkalines, claiming that 1 AA could save you up to $500. The post is interesting, but bears some observations.

1. Energizers might cost you $1/each in the grocery store, but a 48 pack of AA batteries is $10 at Sam’s (confirmed by me today) — that’s about $0.21/battery, and means your max savings is down to about $100/battery
2. At $3 vs. $0.21, you’re not saving any money until you recharge the 15th time: saving $100 is only going to happen if you actually recharge that single AA battery 500 times.
3. Rechargeable batteries eventually lose capacity. I’m going to assume that they’re relatively useless after three years of use. (Just look at your cellphone battery) You COULD go on using them, and you might, but they’re not going to last long enough to be worth your while.
4. What are you going to do while your batteries are recharging? You’re still going to end up sticking alkalines in your devices every once in a while to tide you over, whether that be for 1/2 hour or 14 hours, depending on your charger–so, your savings will be less than indicated.

OK, so what does that look like then?

1. Remote control:
   • Average time to change batteries? Maybe twice a year.
   • Time to savings: 7 years
   • Capacity of rechargable batteries after 7 years (if they even work after 7 years)? 0
   • Savings: $0
2. Battery-hogging Wireless Mouse (2xAA):
   • Average time to change batteries? Once a week
   • Time to savings: 4 months
   • Useful battery life: 3 years (150 actual charge cycles)
   • Savings (life of 1 set of 2 rechargeables): $57
3. Clock (1xAA):
   • Average time to change batteries? Maybe once a year.
   • Time to savings: 14 years
   • Capacity of rechargable batteries after 7 years? 0
   • Savings: $-1.53
4. Wii Controller (2xAA):
   • Average replacement? (@25 hrs of gameplay = between 3 – 30 days)
   • Time to savings: 42 – 196 days
   • Useful battery life: 3 years (between 36 – 365 charges)
   • Savings: $15 – $150

Bottom line: some things are worth using rechargeables for. Some things aren’t. $500 in savings per battery is a bit sensationalistic though–it’s more likely you’ll see $50-100 in savings over 3-5 years per battery if you use them consistently and vigorously: and that assumes that the rechargeables last as long as the Alkalines do, which may or may not be true depending on usage.

It’s also interesting to note that some things (like Wii Controllers) may be worth using both for. Let’s say you have kids who play 24/7 with two controllers, but you have two controllers for the parents or friends to use, which get used maybe 4 hours a week. It’s going to take you 2 years of use to justify buying rechargeables for the mostly-unused controllers, assuming they get consistent weekly usage. If they’re not going to get that kind of use for more than 2 years, use alkalines for the rarely-used devices, and stick rechargeables in the others.

Thanks to the Always Frugal lady though for bringing it up again! Even at dirt-cheap $10 for 48 AA’s at Sam’s, I probably should invest in a rechargeable system for two Wii controllers. Just don’t go counting $100-500 in savings per battery as you pick up rechargeables for every electronic device in your household!