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#11
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Rechargeable AA Batteries for Sony DSC-P50
Tim Smith wrote: On 2004-07-10, Larry R Harrison Jr wrote: There are also special NiMH batteries that can be charged in 15 minutes in appropriate chargers. They say "I-C3". Those look nice. Wal mart sells a very entry-level device that includes 2 I-C3 (looks like AA sized) batteries and a charger for $28 ... Do those last as long as regular NiMH batteries that take 1-2 hours to charge? By "last as long" I don't mean number of rechargers (though if you know that you can share). I mean how long before you have to recharge it. They should. The number you want to look at for a battery is the mAh rating. I believe those batteries are 2000 mAh. "mAh" means "milliamp hours" and is a measure of the total energy the battery can deliver. A 2000 mAh battery could theoretically power a device that needs 1 milliamp for 2000 hours, or a 2000 milliamp device for 1 hour, or a 500 milliamp device for 4 hours, and so on. (Batteries have other limits, such as maximum current, so not all of these combinations are possible--it would not work to try to power a 7200 amp device for 1 second!). I know you were just putting out numbers, but at 1-4 hours there would probably be a substantial loss of energy to internal resistance. At 2000 hours, there would inevitably be a loss to self-discharge. In a practical sense, a high-drain device (i.e. digital camera) will render a battery useless when it still has substantial usuable capacity for a lower drain device. |
#12
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Rechargeable AA Batteries for Sony DSC-P50
Tim Smith wrote: On 2004-07-10, Larry R Harrison Jr wrote: I found this at Radio Shack which has four 1800mAh NiMH AA batteries & a quick charger for $30. Catalog # 23-043 http://www.radioshack.com/product.as...ct%5Fid=23-043 (the # is part of the link) Is this the way you guys would go? Any other cheaper & just as good options (or am I being a tight-wad)? Radio Shack seems a little bit behind on NiMH AA batteries. It's not hard to find ones with 2000-2200 mAh. (A couple years ago, when I switched all my battery-powered devices except the smoke alarms over the NiMH, 1200 mAh was the norm). The chargers have also been improving. My two year old charger takes about 8 hours to charge a pair of 1200 mAH batteries(the batteries have to be charged in pairs). The charger I bought about a month ago does 1-4 2000 mAH batteries in an hour. Now I see that model has been replaced by one that does it in 30 minutes: URL:http://www.bestbuy.com/site/olspage....97111512&skuId =5835894&type=product There are also special NiMH batteries that can be charged in 15 minutes in appropriate chargers. They say "I-C3". NiMH batteries are no longer the speciality item they were a few years ago. They and their chargers are widely available at places like Best Buy, Circuit City, Target, Wal-Mart, etc., so I'd suggest looking around at a few local places. Actually - the batteries are fine. I just picked up two packs of Energizer 2300 mAh batteries for $9.99 each (in 4-packs) at Target. I think they may be found at Wal-Mart at about the same price. These appear to be the same Japanese-made batteries (marked "HR" on the negative terminal) that I've seen sold under several brand names. I've seen them rebranded as Sony, GE/Sanyo, Maxell, Olympus, or Kodak. However - the chargers I've seen at the mass merchandise stores aren't in the same class as the Maha or Ansmann chargers you can find at Thomas-Distributing. The ones at Wal-Mart are either the dumb timed chargers or the super-fast smart chargers. They won't have anything like the Maha MH-C401FS slow/fast charger I use. |
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