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So a C battery just croaked, and all you have handy is an AA. With the $3-$4 Ziotek Battery Upsizer kit, you place the AA in the C-sized plastic holder, and you’re back in business (although for a shorter time because AA batteries cannot supply the current available from C batteries: see battery details). Likewise, you can “upsize” an AAA to an AA using the small plastic tube, a C to a D using the large tube, or go all the way from an AAA to a D by nesting all the tubes.

The manufacturer cautions: “Do not use Battery Upsizers in a battery charger. If you use multiple battery upsizers, do not use batteries of different types at once, or new and used batteries together.”

Has anyone used these? Would they be handy in an emergency?

Ziotek Battery Upsizer [Manufacturer’s Site]
Street Pricing [Google Products]
Via Amazon [What’s This?]

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8 Responses to Ziotek Battery Upsizer

  1. Dan says:

    I have some very much like these from DealExtreme (http://www.dealextreme.com/details.dx/sku.13814, $2.28 for 5 AA-C), and they work fine.

    I have an old camera flash that needs 8 C-cells, and a lot of rechargeable AAs around; ‘padding’ the batteries like this works, and it’s a lot cheaper than buying many many C cells.

  2. Mike47 says:

    The idea is similar to the upsizer available to convert a 6-volt hand lantern from one 6-volt spring top battery to four 1.5 volt D-cells. That one is hard to find, but VERY handy.

  3. Andrew C says:

    For emergency use, a ball of tinfoil tucked between the contact and the positive terminal will often suffice, with some newspaper around the battery to prevent it from jiggling too much. For non-emergency use, just buy the right size battery.

  4. David Bryan says:

    I’ve got some of these and I can’t remember where I got them. American Science & Surplus or some electronic surplus catalog. I like ’em.

  5. Paul says:

    cool idea, it always seems liek I have D’s and no AAA’s though, so not much help that way

  6. Aaron J. says:

    A few quarters will let a C fit as a D
    A 9 volt contains 6 AAAA (yes 4 A’s) batteries which are just a tad shorter than a AAA

  7. FozzTexx says:

    Back when I was a kid I would run out of C batteries and I would stuff AA batteries into my toys as a substitute. It worked, but the AA batteries were actually slightly longer than a C and it was a tight fit and tended to slightly deform the battery holder.

  8. Nate says:

    They work great. Modern rechargeable AA’s can easily put out more current than an alkaline C or D, or rechargeables of those sizes just a few years old. Lifespan suffers somewhat. (Many rechargeable C’s or D’s are just AA’s in a better-looking wrapper anyway. Check the capacity!)

    I use three AA’s in a wireless doorbell receiver that wants three C’s, and I haven’t yet had problems. I have some AAA–>AA adapters too, but have never used them for anything other than just trying them out once in a flashlight. Some of mine came from DealExtreme, some came from an Eneloop rebate deal, and some came with my BC-900 charger/analyzer.

    They’re definitely fiddly, and easy to drop. The cells try to come out of the adapters, or the contact spring launches something across the room while you’re trying to shove everything into the battery compartment. Still, it beats having to keep C’s around for my doorbell chime.

    Maybe I have enough D adapters to finally fire up that boombox on battery power… With some low-impedance NiMH cells at the core I bet it’ll work fine!

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