I wear hearing aids. The batteries usually last me ten days from the time I pull the sticker off till I get the beeps that tell me it's time to replace them. Now instead of throwing them away I put them both in the two chargers I bought and leave them under a light in the kitchen that stays on all of the time anyway so I'm not using any more electricity than normal and next morning I put them back in and use them for a few more days. (Some of you will want to know the exact number, sorry different brands hold the new charge for different lengths of time. Also, it can vary even with the same battery manufacturer.) I can repeat this process three and sometimes four times before the Zinc/Air battery will no longer take or hold a charge. But this more than doubles my battery life. I can say that before I got these chargers I had roughly a $120 per year battery "habit". Now its more like $40. More than pays the cost of both chargers in the first year. I plan to get a pair of those Power One rechargeable batteries and see how long I can make them last using these chargers. At least I won't have to lay out the $180 for their charger.
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Although hearing aid batteries have a very short life (less than a week) and an inexpensive recharger is sorely needed, this one is absolutely not up to the task. It's a quite small, flimsy, cardboard item consisting of an alligator clip, a hook, a tiny red light and something that allegedly is a solar panel.
For me, the red charging light went on only under the brightest of sun light. Even after a few days recharging, the battery gave a charge of maybe three hours -hardly worth the cost of $20 plus almost $6 in shipping and handling. And then the cost and bother of returning it.
Unfortunately, I had high expectations of keeping my battery costs down, so I was throughly disappointed with this mickey mouse item.
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THIS IS A 1.5 VOLT BUTTON CELL CHARGER THAT IS NOT AUTOMATIC, SO YOU WILL HAVE TO BE CAREFULL HOW LONG YOU CHARGE THE BUTTON CELL BATTERY BECAUSE IF YOU FORGET AND CHARGE IT FOR A FEW DAY YOU WILL DAMAGE THE BATTERY.
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I bought this for my father in-law that lives in a foreign country and wears a hearing aid. But I had to try it out first and it charged a CR2032 to 3.1 volts while it didn't last as long as a fresh battery it was better than buying a new one.
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I had it a couple weeks and it quit working. It was not worth postage to send it back. You get what you pay for.
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