Function to keep track of time playing since last charge?

[ozjeremy]

For determining things like battery health, I think it'd be useful if there were a way for rockbox to keep track of how many hours/minutes it's been on since the last charge. I'm not a programmer, so I don't know how to do it myself, but I was thinking it might be something like:

Rockbox records the time when it turns on, and the time when it turns off. And the time when the cable is unplugged after the most recent charge. (To save space, when the cable is plugged IN for a charge it could delete the earlier timeon/timeoff values. Or the plugin could have an option to reset.)

Then when the plugin runs, all it has to do is add up the (time off-time on) periods since the last charge.

Then you'd have an idea (a) how your battery is going and (b) how much longer it's likely to have based on last time. (Since the time remaining function is still not working.)

Anyone able/willing to do this, or something similar?

[spiral]

maybe you wonder but there is exactly such a function in the debug menu !
it works exactly the way you described
the only minor difference is it doesn't extract any runtime-files... you have to look before you plug in the charger
and i think it isn't perfectly accurate
look for "view runtime"

[ozjeremy]

Typical. Whenever I ask for a feature it's already been implemented somewhere!

Although - why isn't it perfectly accurate?

[Danfried]

I think it is accurate -- to do what Ozjeremy wanted you can just reset the Runtime timer yourself after charging. If your aim is to calculate battery life, you don't need super accuracy anyway.

[Febs]

Take a look at the Battery Benchmark plugin.

The Battery Benchmark Plugin enables you to test your battery’s performance, while making normal use of your player. Once loaded it will run in the background (TSR plugin), reading various info about your battery while you use it. Once you finish your session you can find the benchmark output data in a file on your player /battery_bench.txt.

[spiral]

Originally Posted by ozjeremy

Although - why isn't it perfectly accurate?

because sometimes when i look into it, it shows 40 hours runtime and that is not true for my standard battery

try febs recommendation but this will only work for one session so just for specially benchmarking your battery under specified circumstances

[Hitboy]

The time in the 'view runtime' debug screen only resets when you press NAVI or plug the A/C adapter. Then it will keep going until you reset it again.