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Old 09-08-2007, 04:03 PM   #21
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I've now had about seven more batteries leak.

So, this product is NOT RECOMMENDED.
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Old 09-08-2007, 04:23 PM   #22
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Originally Posted by TromboneAl View Post
I've now had about seven more batteries leak.

So, this product is NOT RECOMMENDED.
T-Al, there was a line of Alkaline batteries that were designed to be re-energized. I'm pretty sure they took them off the market, though.

I don't know if they had leak problems, or just not enough consumer interest. It's kind of a hard sell, each re-energize gives a bit less power out each time, but it could still be a good thing to get a bit more life out of each.

I had one, and IIRC, the charger got ruined from leaks from the regular alkaline I put in there. By then, they were off the market already.

-ERD50
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Old 09-08-2007, 05:31 PM   #23
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I just bought some Hybrio batteries -- same idea as the Eneloops, but head-to-head tests give a slight edge to the Hybrios.
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Old 09-08-2007, 05:44 PM   #24
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I've now had about seven more batteries leak.

So, this product is NOT RECOMMENDED.
My BIL is a retired engineer who spent his career working for the company with the pink bunny. He says attempting to recharge alkaline batteries is a bad idea, as you have confirmed.

But heck, I enjoyed hearing about your experiment. Yep, got a real charge out of it.
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Old 09-08-2007, 09:04 PM   #25
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Ray-o-vac produced a line of rechargeable alkaline cells. The cycle life wasn't very good. I think they would lose about 50% of the original capacity in the first couple of cycles.

RE-Wahoo is correct, I do not recommend recharging alkaline cells. You might save a bit of money. But I just don't think it is worth it.

Alkaline cells have a zinc negative electrode and manganese postive electrode. Both electrodes have cycling problems.

The zinc electrode problems include

- During charge the zinc tends to replate as zinc metal in different locations from where it was discharged. This makes it harder to discharge on the next cycle.
- It can grow dendrites to the positive electrode during charge and that short circuits the cell.
- Part of the charge current can go to produce hydrogen gas rather than to recharge the electrode. This may be one cause of leakage.

Don't know as as much about the manganese electrode but IRRC there are two discharge products MnO2 (the favored product) and Mn3O4. The Mn3O4 is difficult to recharge and forms non-conductive "barriers" that may also inhibit recharge of the MnO2.

By the way electric vehicles with re-chargeable zinc electrode batteries were supposed to be one of the technologies that would "solve the energy crisis" in the 1970s but the cycle life issues were never satisfactorily resolved and the energy crisis went into hibernation in the 80s and 90s. Since then nickel metal hydride and lithium-ion batteries have been developed and they are the favored technologies.

MB (who once did research on the Zn electrode)
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Old 09-08-2007, 09:06 PM   #26
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My BIL is a retired engineer who spent his career working for the company with the pink bunny. He says attempting to recharge alkaline batteries is a bad idea, as you have confirmed.

But heck, I enjoyed hearing about your experiment. Yep, got a real charge out of it.
Yeh, and it had a lot of potential

MB
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