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Unread 13-08-2013, 22:10
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Re: BatteryBeak: Utility of making internal resistance and state of charge measuremen

Quote:
Originally Posted by WinDnDusT View Post
(Don, did you know that your team was sitting behind mine at Championships during Einstein matches? We were thrilled because our team numbers are sequential)
Yeah, we've kinda fallen for that great UPS brown. I have a 1675 keychain from some regional (Cleveland?) where we were neighbors, that I treasure. (We also met 1677 somewhere!)
Quote:
Originally Posted by WinDnDusT View Post
Does this imply that a battery can have reduced capacity without having an increased/abnormal internal resistance?
Internal resistance is more than a hypothetical number. If a battery has 0.1 Ohm internal resistance (for example), it becomes a limiting factor on how many Amperes it can deliver. 12 volts/0.1=120A (assuming zero resistace across the terminals). Now double the resistance to 0.2 Ohm, and the absolute max current drops to 60 A.

Now in the real world, external resistance is significant, but this theoretical exercise helps explain how internal resistance is a good indicator of battery health (and capacity). So, your answer is No.
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