fusion_power said:Yes, this is the way I also want to see the LED's working.rasczak said:Red LED starts glowing when the Battery becomes empty and the blinking starts when it gets really serious, so the last 5-Minutes-reserve or so. Blinking is always a good indicator for Danger.
That'd be my preference as well, simple and clear, universal.
The PSP's battery is where Pandora livesMWeston said:Unlike the PSP which seems to have some electronics in the battery pack that might monitor the level and report battery life, Pandora will manage this in software only. There is quite the collection of parts in a PSP battery. Does it do it this way or am I wrong? My PSP coding experience was a "Hello World!" app a few years ago.
MWeston said:The battery starts at about 4.2V fully charged and crapped out at some point just below 3.5V I think. I took a voltmeter to it about once an hour and with the 8.5 hour battery life I got, it dropped close to 0.1V per hour. Assuming it stays that way until the battery has been charged/discharged many, many times, it is a fairly linear scale. I was actually surprised to see this result, but it works out so well for what we want to do here if it is consistent for every cell
That sounds kind of weird. All the Li-ion cells I've seen drop quickly to 3.7 V and stay mostly flat before a rapid drop at the end of its life. Though... I've only looked at larger cells that one might incorporate in electric vehicle designs.
A coulomb counter would be more accurate for determining the remaining charge, but if the discharge curve really is almost linear, that certainly is convenient...
How about 100%-31% -Green and 30%-0% RedTinnus said:How about that:
100% - green
"0%" - red
between: fade between red and green with oranges in the middle
I hardly know any spanish so correct me if im wrong but i think that would translate into:rasczak said:
My opinion:rasczak said:
MagicPants said:
proflogic said:MWeston said:The battery starts at about 4.2V fully charged and crapped out at some point just below 3.5V I think. I took a voltmeter to it about once an hour and with the 8.5 hour battery life I got, it dropped close to 0.1V per hour. Assuming it stays that way until the battery has been charged/discharged many, many times, it is a fairly linear scale. I was actually surprised to see this result, but it works out so well for what we want to do here if it is consistent for every cell
That sounds kind of weird. All the Li-ion cells I've seen drop quickly to 3.7 V and stay mostly flat before a rapid drop at the end of its life. Though... I've only looked at larger cells that one might incorporate in electric vehicle designs.
A coulomb counter would be more accurate for determining the remaining charge, but if the discharge curve really is almost linear, that certainly is convenient...
None of the li-ion batteries I've ever dealt with have a linear discharge. It's usually almost linear, dropping very little until it hits the "knee" of the curve, at which point the voltage drops sharply. From what MWeston is saying, sounds like that's exactly what happens, with 3.5V being the cutoff. Optimal operating voltage is probably around 3.8 volts.
Li-ion don't like to be overly discharged. Hitting 3.5V often will cause severe damage and can reduce battery life drastically.
Even if you take care of it, over time the battery will lose it's chargeability, but it shouldn't affect the max and min voltages. If you label 4.2V as 100% and 3.5V as 0%, and just do a linear scale between the two, that should be close enough. For best results, keep it stored at around 40%, and don't let it fall below 20%.
WizardStan said:proflogic said:and store it somewhere cool, warm temperatures tend to damage the battery.MWeston said:The battery starts at about 4.2V fully charged and crapped out at some point just below 3.5V I think. I took a voltmeter to it about once an hour and with the 8.5 hour battery life I got, it dropped close to 0.1V per hour. Assuming it stays that way until the battery has been charged/discharged many, many times, it is a fairly linear scale. I was actually surprised to see this result, but it works out so well for what we want to do here if it is consistent for every cell
That sounds kind of weird. All the Li-ion cells I've seen drop quickly to 3.7 V and stay mostly flat before a rapid drop at the end of its life. Though... I've only looked at larger cells that one might incorporate in electric vehicle designs.
A coulomb counter would be more accurate for determining the remaining charge, but if the discharge curve really is almost linear, that certainly is convenient...
None of the li-ion batteries I've ever dealt with have a linear discharge. It's usually almost linear, dropping very little until it hits the "knee" of the curve, at which point the voltage drops sharply. From what MWeston is saying, sounds like that's exactly what happens, with 3.5V being the cutoff. Optimal operating voltage is probably around 3.8 volts.
Li-ion don't like to be overly discharged. Hitting 3.5V often will cause severe damage and can reduce battery life drastically.
Even if you take care of it, over time the battery will lose it's chargeability, but it shouldn't affect the max and min voltages. If you label 4.2V as 100% and 3.5V as 0%, and just do a linear scale between the two, that should be close enough. For best results, keep it stored at around 40%, and don't let it fall below 20%.
rokdcasbah said:
If the orange light comes on, you know you've only got so much time left. What benefit does a flashing red add?Pleng said:
OK, maybe you, but not me. When orange LED lit, I not draw phone to look what time is and start 25 minutes count down. If I can't reach power plug, I like to be inform about critical state to safely turn off a device.WizardStan said:
