When charged from this point, I have not had a SINGLE cell leak while charging it or during use see the catches below Cells that have been brought down to the modern standard of "dead" at 1 volt, DO charge ok and can survive several charge cycles best is 7 so far but their capacity is severely diminished each time and rapidly become useless after just a few charges.
I have also found that these batteries are far more prone to leaking and have had two leak on me when charging during my testing, both after 8 cycles. I haven't had one leak in a test device yet Some numbers about the status of the batteries post charge for the nerdy types like me: Charge termination voltage: 1. A second cycle brings the "rest" voltage to 1. There ARE a few catches to using recharged alkaline batteries so please read the following! As you can see the capacity is NOT going to be the same as a new one and drops off rapidly with each cycle.
With a single charge cycles, the Renewal charger shuts down when the battery reaches 1. I find it usually settles at around 1. At this point I pop them back in for another round. You'll only get about cycles out of any battery brought down to 1 volt regardless of using the technique or not, so why not make each cycle count?
Recharged alkaline are much, MUCH more prone to leakage. DON'T use them in expensive or irreplaceable devices OR devices that will sit around unused for a long time! Recharging "AAA" size batteries if they are under 1. This charger's current is a bit too high to recharge AAA's safely.
New batteries or ones over 1. Myself, instructables. Other than that, have fun recharging! Just don't come crying to me if it all goes sideways!
If you have a problem or question, I'll gladly help if I can, but I'm no miracle worker : Safety Tips! It's harmless so long as you don't try and drink it, keep it our of your eyes and wash it off your skin and any surface it's come in contact with like the inside of your charger using a clean damp rag with relative prudence.
A few minutes of contact can lead to skin irritation, so rubber gloves are NEVER a bad idea when handling leaking batteries! I haven't had any batteries fail in a "spectacular" way such as detonating, rocketing across the room, spraying acid in all directions, melting a hole into the basement or forcing me to whistle "Row, row, row your boat" while going naked through a car wash, but it doesn't mean that it's impossible.
The renewal chargers have a plastic cover that I'd highly recommend that you keep CLOSED while charging in order to help guard against freak accidents.
Supervision and not letting them charge unattended is never a bad idea also! They WILL fail and probably leak! End of story! This charger, modified or factory, is NOT it. This is not a joke.
This is not up for debate. Do not even be curious about what happens. This is a repeat from my "catches" section, but it bears repeating. The electro-chemical process from charging an alkaline puts a high amount of stress on the cell and makes them far more prone to leaking!
I haven't had one leak when NOT charging yet, but, just DON'T use them in expensive or irreplaceable devices unless you understand and accept the risks! Enjoy sticking it to the man AND keeping more batteries out of landfills! If anyone is still reading this after all these yrs I have the PS2 and after taking out the 'safety' tabs as I discussed earlier, putting in alkaline batteries without the 'safety' guide is a little fidgety.
I solved this by sticking some foam door sealer under the batteries. Now, it's just like working with the original Renewal batteries. Failures: Batteries that start below 1 volt are most likely not going to be good candidates. Even if you can charge them close to 1. Just toss 'em. Examine all batteries carefully Just like with the Renewal batteries, after the light goes out, pull the negative bar back spring loaded and let it go back into place for another charge.
It should go out again in a few seconds if it's really close to full charge. Some take more on the second go around. Probably the battery itself or even the station's old electronics see my comment in another post about electrolytic capacitors. I dunno. If after trying all of above, you can't get the battery back up to at least 1. I test them out of the charger, then an hr later and then once again out of the battery bag before putting into a device.
It is generally not a good idea to recharge regular alkaline batteries. The reason being is they produce a lot of gas, and thus frequently end up rupturing the seals. The seal may not fail until days later - after the battery you thought was good and you put it into a device Reply 11 years ago on Introduction.
Actually, the gas hydrogen is re-absorbed into the electrolyte after the battery has been resting for some time, this relieves the pressure you are referring to. This is also why the voltage tends to drop off after it's been sitting idle for an hour or 5 if you're bringing the battery back from "the brink" or a very low discharge state.
So, your warning is sound, but you really don't need to worry about the battery "bursting" the seal days later. If the cell leaks when not charging it's usually not due to any internal pressure, it's because the seal had degraded and failed from either age, poor manufacturing or the stress of being re-charged from a very dead state. I will be updating my guide in very short order in order to reflect new information I have now that I have been recharging and using recharged alkalines for more than a month.
Thanks for you comment! Reply 9 years ago on Introduction. For a battery that has zero provisions to be recharged, I find it very difficult to believe that gassing would be re-absorbed. Rechargeable types such as NiCad and NiMh have mechanisms to insure only oxygen is produced, saving hydrogen for only more severe overcharges, of which one or more mechanisms is used to recombine gas. For non-rechargeable alkaline cells, the gas will be oxygen and hydrogen as it is splitting the water in the electrolyte.
It is true, however that gas production in Alkaline cells is reduced not recombined to some point by the major manufacturers during normal discharge, but once the first discharge takes place, the cell is no longer as stable. One way is said to reduce gassing during charge is to hit the cell with some current pulse, then back off for a rest, etc. Since the water is consumed in the discharge process, the cell gets drier and drier the more it is reused.
This is one process of leading to ever increasing internal resistance. The recharged cell will retain the increased internal resistance of the former discharged. So yes, there is less water available for splitting, ie.
The zinc does not like to replate evenly, rather it is unstable and likes to form dendrites, which results in the voltage spiking up, and going down quickly when the cells are reused, which results in low capacity. These sorts of things are tightly controlled in NiCad and NiMh since not only are they rechargeable in theory, but by design they have mechanisms and stabilizers to ensure the metals replate were it belongs, and how and when gas is evolved, etc.
NiCad and NiMh have a few more things going for them. The seal is much stronger to withstand repeated charging. So in a sense, leaks are much rarer and you have a lot more time catch it before the equipment in which the cells are installed is damaged. I have to give Rayovac credit, they took steps to make a semi-rechargeable Alkaline, but as using them yourself, you saw that even a "rechargeable" alkaline cell isn't the most rechargeable thing out there.
In this day in age we have very nice low self discharge NiMh technology commonly available, I wonder why people continue to mess with recharging alkaline cells? Reply 1 year ago. I used hundreds of the Renewal batteries back in the day The problem with the original Renewals was they often leaked before you got all your recharge cycless out of them. And I'm finding the same problems with present alkaline batteries, even before you try to 'recharge' them.
In other words, the present state of production alkalines is not that great with respect to leaking. Whatever they used to do to prevent batteries from leaking all over your device, is not presently done to the same extent as it once was.
I think we still mess with Alkaline batteries over the NiMh technology because of two things; cost and the 'kick' alkalines give to most devices. I have several NiMh stations and it's obvious to see the difference. The NiMh batteries will give you 1.
It's very apparent in devices such as walkie talkies that say take eight or more batteries. Just like the old NiCad batteries, you'll need one 'extra' to run the device unless you're using alkalines. Many people say the NiMh batteries last longer in a device than the alkalines. I say they're full of sheep dip as that's not been my experience at all. That's why I said to treat all these batteries as individuals-don't expect them all to come 'back'.
And certainly keep looking for leakers, even after they've been in the devices. Reply 6 years ago. I have a Rayovac charging station similar to that, but designed slightly different. It is not branded Renewal. It does not have any restrictions in place to prevent you from putting different batteries in it.
I'm not sure how it knows which voltage to use since NiMH batteries are lower voltage. But it does work for recharging grey Rayovac branded batteries that are not marked rechargeable. For grins, I tried a Zinc Chloride "Heavy Duty" battery and it just got hot and melted the plastic label on the battery. Old thread! I have two of the stations from back in the day and one 'pocket' charger Based on the voltage profile of this cell, the PS3 can determine whether this is an alkaline cell, or a NiMH cell.
But for an alkaline cell, charging current will gradually decrease with higher terminal voltage until it reached 1. The Rayovac PS3 is designed to recharge the Rayovac 'Renewal' brand of rechargeable alkaline cells which are now discontinued. The user manual warned against charging ordinary disposable alkaline cells, but I experimented with it anyway. Initially I observed good results in reviving a lot of spent alkaline AA and D cells.
But my happiness was short-lived, because after a few weeks, some of those cells started leaking electrolyte. I was lucky that the leaks were discovered early, and they only caused minor damages to some cheaper appliances.
My conclusion is that: it is not worth the risk to recharge disposable alkaline cells. You have been warned! It turns out that each of the four charging channels can accept one to two AA or AAA cells, but the two cells are electrically connected in parallel.
So in case somebody accidentally placed two cells of different battery chemistries NiCd, NiMH, or alkaline in the same channel, the one with lower voltage will discharge the other one. The charger may also get confused and fail to terminate correctly in such case. Get it while you can, if you still can. I've used a lot of different chargers, but this one does everything, and does it well. I already have one that's worked perfectly for months. I use it every day for NiMH batteries. It also works fine with NiCads.
I bought this one while I still could, so I have a spare. Heck, at this price, I might even buy one more.
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