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RE: Linear Power Supply or Battery on Mac Mini - pics


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?

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