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ReZap 7329 AA to C and D-Sized Battery Converters

3.7 out of 5 stars 40 customer reviews

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  • Item model number: 7329
  • Brand Name: ReZap
  • These battery converters eliminate the need for you to carry C or D-sized batteries altogether. Package contains 2 AA to C adapters and 2 AA to D adapters.
3 new from $3.99

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Technical Details

  • Brand Name: ReZap
  • Model Number: 7329
  • Item Package Quantity: 1

Product Description

Converting AA-size batteries into C or D-sized batteries is easy. These battery converters eliminate the need for you to carry C or D-sized batteries altogether. Simply place one AA-sized battery into the appropriate converter and the unit can be used as a C or D-sized battery! Convenient, Reduce Weight & Save Money.

Product Information

Product Dimensions 3 x 1 x 5 inches
Item Weight 2.4 ounces
Shipping Weight 2.4 ounces
Manufacturer ReZap
ASIN B003KGB6ZE
Item model number 7329
Customer Reviews
3.7 out of 5 stars 40 customer reviews

3.7 out of 5 stars
Best Sellers Rank #5,106 in Computers & Accessories > Laptop Accessories > Batteries
Date first available at Amazon.com May 1, 2010

Warranty & Support

Product Warranty: For warranty information about this product, please click here

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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Verified Purchase
I have a ton of AA/AAA rechargeables and almost no devices that take anything else, so when I recently got a couple of devices that needed D batteries, I decided to get two sets of these. Buying rechargeable C/D-sized batteries and the appropriate charger is a waste, unless you have devices that drain batteries fast enough to make it worth buying the "real" (and expensive) C/D-sized rechargeables, rather than the cheaper ones that are just basically...a AA rechargeable in a C/D-sized shell!

The C spacers work fine; they're the same length as a AA battery, so there's no need for an extender, thus it's just a plastic clamshell. I imagine they might eventually break at the seam, but they'd still work just fine and safely even if that was the case.

The D spacers are more finicky. As others have pointed out, the metal spacers have a tendency not to stay in place. Of the four D shells I received, one of them had warped plastic and a metal spacer that FLEW right out of the shell the first time I opened it. Even playing around with the plastic shell and bending the metal spacer, I couldn't get it to ever stay in place, and sticking it back in was a pain compared to the other three D shells due to how the plastic was warped.

I ended up returning one set of these and keeping the other, since one of the devices I got it for won't be used much, so I just bought D-sized alkalines for it. I would buy these again if I did need more C or D-sized batteries in something where I was going through batteries more frequently, but not fast enough to bother with C/D rechargeables.

In short, these spacers are cheap, work okay (though quality control is lacking), and seem to be the best option for the price.
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Verified Purchase
The description doesnt mention this, but this one comes with 2 C and 2 D adapters. Works perfectly as intended and fits snugly.

*Update: April 2014*
WOW ! 3 years later i want to buy the same item and its double the cost !!! i bought it for $4.99 in 2011 and its now $9.99
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Verified Purchase
I previously had purchased expensive fake D-cell rechargeables along with the respective charger for an infant swing. After $50 and 17 hours of charge time, the batteries quickly died. After inspecting the battery packaging, I discovered the batteries were only 2500mAh. I already had AA's with the same rating. That ripoff went back to the store and I bought these. Perfect. I now have the same result at a far more reasonable price; and I can use the batteries and ONE HOUR charger that I already own. Just be careful that the bottom metal plate of the adapter shell is aligned properly with the slot in the plastic and don't force it and they should last quite some time. I would very much recommend this product to anyone needing C's and D's in high drain applications (i.e kids toys). For high-temperature or long-term storage applications (i.e. Flashlights, Weather radio), I would still suggest alkaline.
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Verified Purchase
These are nice spacers that completely encase the battery, unlike the Eneloop ones that that surround the battery with an open air case. Try aligning the battery contacts to the gadget contacts and you'll see how much of a pain in the butt it is to pop in with the Eneloops. These you can push right in and the contacts are wide enough that you don't have any misalignments the first go around. The biggest negative currently is that the plastic hinges break easily. Mine broke within the first five minutes of opening the package. Fortunately the case has a snug enough fit that it doesn't seem to entirely need the hinges to stay closed.
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Verified Purchase
I've had these for about 6 weeks and so far I like them very well. The D converters have a button on the bottom that helps with making a good contact which has sometimes been a problem with the eneloop converters. I like the design, too. The batteries don't just slide through a cylinder they are encased in a hinged case that fits them very well. I use these to power my IRobot roomba and scooba lighthouses with rechargeable AA's so the I am not eating up tons of alkaline batteries.
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Verified Purchase
The C converters wouldn't work in a kid's toy that places the batteries side by side. The plastic casing prevented the positive node from making contact with the toy's metal contact plate. In a flashlight, where the batteries stacked on top of one another, these worked fine. It depends on what you're using them for.

The D converters have metal spacers, which should prevent this kind of problem, but I see other people have trouble with those spacers staying in place.

An interesting solution to buying C rechargeables, but not right for every use.
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By RAR on October 8, 2010
Verified Purchase
This product works well, just need to be careful of not to lose the end pieces since they fall out of the end of the canister. Overall it works well.
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Verified Purchase
The D-size cases work really well, better than other semi-transparent cases I have. The C-size case will work in a device that doesn't have a thick barrier in between batteries placed in series where the positve (+) "nub" has to reach the back of the negative (-) side. AA batteries are longer than C batteries, but, the C battery positive (+) connection "nub" is longer than the AA connection "nub", so the AA batteries might not reach in some situations. Also, since AA batteries are longer, you might need a device that has a spring or bending/springing metal where the batteries go so they can fit.
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