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In Reply to: RE: Linear Power Supply or Battery on Mac Mini - pics posted by AbeCollins on December 21, 2014 at 18:27:01
It would be interesting to see what a high "C" lithium battery looks like on the scope.The "C" Rating is the maximum discharge rate of the battery.
11.1 volt 2000mAh @ 10C
2000 milliamps = 2 amps
2 Amps x 10C = 20 amps discharge rate.These little batteries are available up to 80C or more,
Only issue is they are either 11 volts or 14 volts but it would be interesting to know if they are quick enough to provide a stiffer supply.
Edits: 12/27/14Follow Ups:
It might be interesting to try a couple different battery types, view their outputs on a scope, and maybe even place some ultracaps across them. However, beyond being more than sufficient to properly power the computer, I'm not convinced there will be an audible benefit.
It is my understanding that the true Ah capacity of a given battery will vary depending on the discharge rate. It's not a linear relationship so most SLA battery Ah ratings are normalized to C/20. In other words, if you take the manufacturers Ah rating for the battery, that is based on the Ah marking / 20. So a battery spec'd at 7-Ah is based on a discharge rate of 7A/20 or 350mA for 20 hours. But it may not deliver 7-Amperes for a full hour.
Other than the max C-Rating, how do they arrive at the Ah rating for thos lithium batteries? At what C rating is Ah determined?
"Other than the max C-Rating, how do they arrive at the Ah rating for thos lithium batteries? At what C rating is Ah determined?"
I really don't know, I presumed it was based @ or about the maximum C rating just for the fact that in application the batteries are typically run close to max.
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