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#1
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Which charger to use
I have a collection of AA NI-MH batteries of various mA ratings. 1850,
2000, 2300, 2500 and I am thinking of getting some Maha Powerex 2700mA. The chargers I have are made by Energizer(15min charger), PowerMart (1 hr charger), and an old Radio Shack 1hr charger. Can I use the same charger for all of these amperages with the end result that they will all be charged to their individual maximum capacity? |
#2
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Which charger to use
"quess who" wrote in message news I have a collection of AA NI-MH batteries of various mA ratings. 1850, 2000, 2300, 2500 and I am thinking of getting some Maha Powerex 2700mA. The chargers I have are made by Energizer(15min charger), PowerMart (1 hr charger), and an old Radio Shack 1hr charger. Can I use the same charger for all of these amperages with the end result that they will all be charged to their individual maximum capacity? Some chargers require you to charge the batteries in pairs, you want to avoid those. Find a smart charger that will monitor each cell's state of charge. Try to make up matched sets of batteries for your camera. Keep the matched sets together. NiMH do self discharge to some degreee, reportedly some are worse than others. |
#3
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Which charger to use
On Fri, 20 Oct 2006 00:13:44 GMT, quess who wrote:
I have a collection of AA NI-MH batteries of various mA ratings. 1850, 2000, 2300, 2500 and I am thinking of getting some Maha Powerex 2700mA. The chargers I have are made by Energizer(15min charger), PowerMart (1 hr charger), and an old Radio Shack 1hr charger. Can I use the same charger for all of these amperages with the end result that they will all be charged to their individual maximum capacity? Your chargers should all work properly for all of these batteries with one exception. If any of the chargers has a protective time-out circuit, the highest capacity batteries, if fully discharged *might* trigger the time-out before they're fully charged. But this is pretty unlikely, as most of the cut off times I've seen have been well beyond the time it would take to charge batteries. When you get the 2,700 mAh batteries, monitor how long it takes to charge them when they're fully depleted. It should take slightly longer than when the same test is performed with your 2,500 and 2,300 mAh batteries. If it takes significantly longer (say 40% longer), then your old batteries have lost a lot of capacity and you might want to use them for radios or something, but not in your camera, unless you tend to take a fairly small number of pictures whenever you use your camera. |
#4
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Which charger to use
On Oct 19, 5:13 pm, quess who wrote: I have a collection of AA NI-MH batteries of various mA ratings. 1850, 2000, 2300, 2500 and I am thinking of getting some Maha Powerex 2700mA. The chargers I have are made by Energizer(15min charger), PowerMart (1 hr charger), and an old Radio Shack 1hr charger. Can I use the same charger for all of these amperages with the end result that they will all be charged to their individual maximum capacity? One 'danger' is whether or not the charger inputs electricity at too rapid a rate for the batteries to accept. Some batteries must be charged at a lower rate unless they are designed for rapid charging. Another issue is if the charger is optimized for the chemistry of the battery...Chargers for NiCad have different operating characteristics and charge characteristics than chargers for NiMH batteries. |
#5
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Which charger to use
ASAAR wrote:
On Fri, 20 Oct 2006 00:13:44 GMT, quess who wrote: I have a collection of AA NI-MH batteries of various mA ratings. 1850, 2000, 2300, 2500 and I am thinking of getting some Maha Powerex 2700mA. The chargers I have are made by Energizer(15min charger), PowerMart (1 hr charger), and an old Radio Shack 1hr charger. Can I use the same charger for all of these amperages with the end result that they will all be charged to their individual maximum capacity? Your chargers should all work properly for all of these batteries with one exception. If any of the chargers has a protective time-out circuit, the highest capacity batteries, if fully discharged *might* trigger the time-out before they're fully charged. But this is pretty unlikely, as most of the cut off times I've seen have been well beyond the time it would take to charge batteries. When you get the 2,700 mAh batteries, monitor how long it takes to charge them when they're fully depleted. It should take slightly longer than when the same test is performed with your 2,500 and 2,300 mAh batteries. If it takes significantly longer (say 40% longer), then your old batteries have lost a lot of capacity and you might want to use them for radios or something, but not in your camera, unless you tend to take a fairly small number of pictures whenever you use your camera. My first purchase was an inexpensive smart charger that came with 4 cells, charges 2 or 4 at a time. These work well, but I upgraded to this. Before postage, this one at less than $23 http://www.greenbatteries.com/nibachwilcdd.html is a bargain, although not so much so when postage is added. It seems to work well, shows charging progress and will charge 1 to 4 cells. I would be wary of the 15 minute charger on cells other than those for which it is designed, just keep an eye on how hot the cells get. Dave Cohen |
#6
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Which charger to use
In article . com,
"wilt" wrote: On Oct 19, 5:13 pm, quess who wrote: I have a collection of AA NI-MH batteries of various mA ratings. 1850, 2000, 2300, 2500 and I am thinking of getting some Maha Powerex 2700mA. The chargers I have are made by Energizer(15min charger), PowerMart (1 hr charger), and an old Radio Shack 1hr charger. Can I use the same charger for all of these amperages with the end result that they will all be charged to their individual maximum capacity? One 'danger' is whether or not the charger inputs electricity at too rapid a rate for the batteries to accept. Some batteries must be charged at a lower rate unless they are designed for rapid charging. Another issue is if the charger is optimized for the chemistry of the battery...Chargers for NiCad have different operating characteristics and charge characteristics than chargers for NiMH batteries. No. The real danger is are the cells you use designed for fast charging? If they aren't they can't vent the gasses built up during charging and then can explode or catch on fire. Recent quality NiMh cells will be marked that they are safe for rapid or fast charging. As a general rule of thumb, any real cell with a capacity of 2000 mAh or more (not simply re-labled cells where the higher capacity exists only on the printing on the label, can be safely fast or rapid charged. Smaller cells will have a problem with fast charging. This includes cells that are simply relabeled with a high capacity. If your cell or its package is not labeled for fast or rapid charge don''t fast or rapid charge them. -- To reply no_ HPMarketing Corp. |
#7
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Which charger to use
On Fri, 20 Oct 2006 17:08:43 GMT, Dave Cohen wrote:
My first purchase was an inexpensive smart charger that came with 4 cells, charges 2 or 4 at a time. These work well, but I upgraded to this. Before postage, this one at less than $23 http://www.greenbatteries.com/nibachwilcdd.html is a bargain, although not so much so when postage is added. It seems to work well, shows charging progress and will charge 1 to 4 cells. I would be wary of the 15 minute charger on cells other than those for which it is designed, just keep an eye on how hot the cells get. I almost always recommend smart chargers that can charge any number of, or combination of cell types. In this case I didn't, because the OP asked a fairly specific question that had nothing to do with whether a charger is limited to charging pairs of cells or not. But it's a good point to remember. One other problem those 15 minute chargers may create is related to the heat they produce. I've seen that in some electrical devices that don't have a lot of tolerance in their battery compartments that some batteries are a bit too fat to remove easily if they have to slide in where fingers can't grab them. This has never been a problem with alkaline batteries. It is a problem with NiMH cells, where removal can sometimes be difficult. As far as I'm aware, it has also never been a problem with new NiMH cells, so something is making them obese, and I suspect that the more times they're charged, the fatter they get. Just guessing, but I'd assume that the chargers that heat the batteries the most would be the guiltiest culprits. |
#8
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Which charger to use
Thanks to all who responded. My question was answered very well.
On Fri, 20 Oct 2006 00:13:44 GMT, quess who wrote: I have a collection of AA NI-MH batteries of various mA ratings. 1850, 2000, 2300, 2500 and I am thinking of getting some Maha Powerex 2700mA. The chargers I have are made by Energizer(15min charger), PowerMart (1 hr charger), and an old Radio Shack 1hr charger. Can I use the same charger for all of these amperages with the end result that they will all be charged to their individual maximum capacity? |
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