09-08-2016, 11:04 PM
(This post was last modified: 09-10-2016, 03:40 AM by pfeerick.
Edit Reason: wrong AXP datasheet
)
So they are holding their capacity so far? They haven't started dropping in run-time (yet)? Just curious as the 8000mah battery I have (which is the right dimensions and weight for it's stated capacity) just doesn't seem to be up to the task... I wanted it to run for about 16 hours on / 8 hours charge, but it doesn't seem like it'll be up to the task without pushing the battery right to it's limit.
Yeah, UnixOutlaw is using a modified 3-wire system, and as I said earlier, I would have expected nearer to 6 hours. I just measured my pine64+ 1GB w/ wifi again, and with 5.07v via the microUSB, it averages 290ma when idle and 350ma if the SSH console is active. Probably wouldn't be such a jump if I was using the ethernet or serial terminal. But if I use the average of the two for an 'idle-ish' state, a 2500mah battery should actually get just under 8 hours. For a 4.5 hour run-time, that battery would be nearer to 1500mah... certainly not what it says on the label! This is of course is flogging the battery right down to zero, so the other factor to consider is what voltage the PMIC decides is flat, and do a emergency poweroff!
Will be interesting to find out if it's the default 2.9V, meaning you should be able to get ever last bit out of a lithium battery, or if it's set a bit higher.
Also, I don't think the charge current is anywhere as high as you think it is... the AXP209 AXP803 is capable of charge currents of up to 2.8A, but I haven't seen the pine64 report anything above 600ma charge current, so it certainly isn't configured that way on mine, and I haven't touched the AXP registers. The AXP209 AXP803 defaults to 1200mA. (automatic determination based on input supply stability so it looks like it must be limiting to 500mA ... but then again, the register defaults also indicate the charge LED should work out of the box, so some register settings certainly appear to have been changed to less than optimal settings!
btw UnixOutlaw... the A64 processor in the pine64 isn't as efficient as the R8 on the CHIP. It is also a bit faster (1.2Ghz vs 1Ghz), and has a few other bits and pieces to power also. Compared the the pine64, the CHIP idles at around 230-250mA and fully loaded, is around 490-600mA. The pine64 can easily pull 900ma or more when loaded, so when loaded it can flatten a battery twice as quickly
Yeah, UnixOutlaw is using a modified 3-wire system, and as I said earlier, I would have expected nearer to 6 hours. I just measured my pine64+ 1GB w/ wifi again, and with 5.07v via the microUSB, it averages 290ma when idle and 350ma if the SSH console is active. Probably wouldn't be such a jump if I was using the ethernet or serial terminal. But if I use the average of the two for an 'idle-ish' state, a 2500mah battery should actually get just under 8 hours. For a 4.5 hour run-time, that battery would be nearer to 1500mah... certainly not what it says on the label! This is of course is flogging the battery right down to zero, so the other factor to consider is what voltage the PMIC decides is flat, and do a emergency poweroff!
Will be interesting to find out if it's the default 2.9V, meaning you should be able to get ever last bit out of a lithium battery, or if it's set a bit higher. Also, I don't think the charge current is anywhere as high as you think it is... the AXP209 AXP803 is capable of charge currents of up to 2.8A, but I haven't seen the pine64 report anything above 600ma charge current, so it certainly isn't configured that way on mine, and I haven't touched the AXP registers. The AXP209 AXP803 defaults to 1200mA. (automatic determination based on input supply stability so it looks like it must be limiting to 500mA ... but then again, the register defaults also indicate the charge LED should work out of the box, so some register settings certainly appear to have been changed to less than optimal settings!
btw UnixOutlaw... the A64 processor in the pine64 isn't as efficient as the R8 on the CHIP. It is also a bit faster (1.2Ghz vs 1Ghz), and has a few other bits and pieces to power also. Compared the the pine64, the CHIP idles at around 230-250mA and fully loaded, is around 490-600mA. The pine64 can easily pull 900ma or more when loaded, so when loaded it can flatten a battery twice as quickly
(09-08-2016, 07:22 AM)MarkHaysHarris777 Wrote: ... I have two of them; one is blue and labeled with the silver Pine64 logo. The other is an unmarked silvered lipo of the same size (performance tests indicate that it is also 8000 mah.
