Top positive review
Great fit, great idea!
on October 22, 2013
I started switching over to rechargeable batteries a few years ago. It just made sense, as I soon learned how much money I was saving by investing in them up front and replacing hundreds, if not thousands, of alkaline batteries. Thousands of batteries that ultimately could end up in landfills (if my local e-waste drop-off doesn't dispose of them safely). So the switch to rechargeable was saving me tons of money and preventing a LOT of unnecessary waste.
All that frugality and eco-friendliness was great... until I had the need for some D batteries. AA rechargeable batteries are easy to find and are very cost effective. Rechargeable D batteries? Not so much. The benefit of a D battery over a AA is that the D holds about 5 times the capacity, so it will last much longer in high drain devices (like your 80's ghetto blaster). Not only are rechargeable D's harder to find and are much, MUCH more expensive, but many have only about 25% more capacity than a rechargeable AA (2500 mAh vs 2000 mAh). The 2500 mAh in some rechargeable D batteries is about a quarter of the capacity of an alkaline equivalent, essentially negating the efficacy of buying that battery. I didn't want to purchase alkaline D's, as I would be contributing to more battery waste again. Higher capacity rechargeable D batteries are out there, going all the way up to 10,000 mAh, but are about $8 each and depending on your charger, may take a really long time to recharge.
But then I found the eneloop Spacer Pack. I've purchased eneloop AA batteries in the past and have been very happy with the performance, so I was purchasing these from a company I trusted. The AA batteries pop in with a "snap", and you're ready to go. The spacers have flawlessly fit all D applications for which I've tried them.
Note: The AA batteries will obviously still have only the capacity of a AA battery, so bear in mind you will be using a lower capacity AA in D battery applications. This means you will have to recharge your AA batteries more than you would be replacing alkaline or higher capacity rechargeable D's. I think it's a small price to pay for the convenience of using my AA batteries in multiple applications.
Bottom line: Save money and go green by using rechargeable batteries. These D battery spacers are good quality and the AA batteries snap right in. If cost is less of an issue and you don't want to recharge that much, you may want to invest in the 10,000 mAh rechargeable D batteries, but you will be doing so at a heftier price. Lenmar also makes these AA to D spacers, which sell for a few dollars cheaper, and I can't see a noticeable difference between the two.