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Old 27th December 2010, 08:05 AM   #11
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Quote:
Originally Posted by nightanole View Post
Im looking for a simple circuit to discharge batteries to around 33% (14v) and the cut off. . Current will be an amp or less. It would be nice if the circuit ran off of the battery.

I was thinking of using a large 12v relay with some resistors in series with the coil and sort of have it release once the voltage gets low enough.
battery type (Li-on, Pb, carbon...)? starting voltage? A/h rating of the batteries? Preferred time period? REason? Environment?
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Old 27th December 2010, 01:26 PM   #12
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Li ion 4 cell 16.5v full charge 1400 or 2200mah
Time period doesnt matter but im limited to 1amp charge/discharge
Reason is long term storage. Storing at zero charge would kill them. Storing at 30-40% reduces lost capacity by over half vs a full charge storage.
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Old 28th December 2010, 05:58 PM   #13
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Originally Posted by nightanole View Post
Or how the ipod estimates battery power by how many mp3's you played and at what bit rate, instead of a current or voltage monitor.
I think that you are talking about two different things.

The software would estimate remaining battery life before recharge based on the the parameters you describe.

The actual battery power management circuit used the absolute electrical values to manage charging.

The former is information calculated about the state of charge, and reported to the user, while the latter is the actual charge management used electrically.

An analogy might be while performing an install or download on a computer ... there is a GUI progress bar estimating how long a process will take, based on a dynamic sample of what has happened recently, while the actual install or download takes ... well ... as long as it takes. The two values are probably never the same, and only the latter is "true".

The estimate is based on what has happened and tries to predict what will happen next, while the actual process (until complete) is a future event not yet known but clearly specific (and can be accurately reported, but only after the fact).
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Last edited by Johnny2Bad; 28th December 2010 at 06:06 PM.
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