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How much power is in a 100ah battery
On Fri, 18 Jun 2004 10:01:19 +0000 (UTC), "James"
wrote: "Peter W. Meek" wrote in message .. . On Wed, 16 Jun 2004 10:34:33 -0400, Glenn Ashmore wrote: NiCads develop a memory over time and can't be fully recharged unless they are fully discharged occasionally. This is (almost) a myth. The Ni-Cad memory phenomenon does exist, but I can almost promise that no-one reading this has ever experienced it. I am sorry but you are not entirly correct. Proven many many times and easy to repeat. Take two brand new and identical radio controlled racing cars. FULLY charge and discharge the nicads of one of the cars ten times. Randomly and gently cycle the nicads of the other car ten times. Race the cars. Fully charged/discharged car WILL win. Not only will the car win a short sprint race... It will also win an endurance race. What you are seeing has nothing to do with "memory effect". A new nicad cell needs to be exercised several times to bring it up to its full capacity. The capacity as to charge / discharge cycles is sort of a bell shaped curve. Brand new not as much, after several charge discharge cycles the capacity peaks, then it starts declining with more charge discharge cycles. When discharging them you should never discharge them below about 1 volt per cell. Doing so you run the risk of a cell being reverse charged and that is the kiss of death for that cell. Also nicad's don't like to be float charged like a lead acid battery. A lead acid battery is as happy as can be when it is properly float charged. A nicad is not. It will kill them. A nicad is not the proper battery type for standby power. Don't let a nicad get too hot when charging as that will cause the cell to vent. Once a cell vents it is pretty much history. By the way, there is no such thing as "memory effect". The very early ni cad cells had sort of that problem but it does not exist in modern cells. Regards Gary |
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