Re: XO battery/performance [Devel Digest, Vol 76, Issue 21]
--- On Thu, 7/19/12, Richard Smith rich...@laptop.org wrote: - Boot the XO. Sugar or OFW either will work. - Run on battery and allow the battery to discharge until is says its 90% - Connect power and let the battery charge to full. - Reboot XO and stop at OFW. - ok batman-start - ok 0 bg-acr! - Verify the ACR is really zero. - ok bg-acr@ .bg-acr (Should print zero) ACR: -0.42 - Remove battery (Wait 24 hours, you can do whatever you want with the XO) - Boot XO and stop at OFW - ok batman-start - Insert battery - ok bg-acr@ .bg-acr ACR: -0.84 - ok batman-stop - Poweroff - Remove AC - 25 h battery IN the XO - remove battery - Plug AC - Boot XO and stop at OFW - ok batman-start - Insert battery - ok bg-acr@ .bg-acr ACR -469.52 - ok batman-stop - Remove AC - ok boot Power LED red. Sugar says 2% battery but works! Reboot - ok bg-acr@ .bg-acr (no batman.fth/batman-start) ACR -526.32 , LED red, Sugar 2% battery poweroff -remove battery -insert battery - ok bg-acr@ .bg-acr (no batman.fth/batman-start) ACR -566.32 , LED red, Sugar auto shuts off Tried also after batman-start/stop remove battery etc, no difference LED red, Sugar auto shuts off. Booted another OS, power LED red but works fine with battery (used it for 10-15 min) Moved the battery on another XO just in case, power LED red, Sugar auto shuts off. Booted up with battery, plugged AC, power LED stays red. Remove battery, power LED stays red! Powerd off with AC power LED stays red! Remove AC, power LED went off. Booted without battery, inserted battery, battery shows empty and charging. Charged to about 15% slowly, then jumped to 81% and then 97% in under 1 min and the power LED turned green! Now, you are going to say again that I do not know what I'm doing, but sure none of these looks very normal behavior to me and may have to do with how the battery communicates its state than its state per se. ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: XO battery/performance [Devel Digest, Vol 76, Issue 21]
On 07/21/2012 03:05 AM, Yioryos Asprobounitis wrote: - ok bg-acr@ .bg-acr (Should print zero) ACR: -0.42 Hmm... I was expecting zero. I'm traveling to Taiwan right now and don't have 1.0 or 1.5 with me to check. - Insert battery - ok bg-acr@ .bg-acr ACR: -0.84 .42mAh / 24 hours = 17.5uA so very low. Does not appear to be a hardware fault in the battery. - ok batman-stop - Poweroff - Remove AC - 25 h battery IN the XO - remove battery - Plug AC - Boot XO and stop at OFW - ok batman-start - Insert battery - ok bg-acr@ .bg-acr ACR -469.52 Assuming -.84mAh was where you started thats 468.68 mAh / 25h = 18.7mA which is just about what olpc-pwr-log indicated was happening. This really smells like the EC not going to sleep although I thought we proved it was going to sleep with an earlier test. (Low battery LED going out when you power off) Please dump the registers and EEPROM (bat-dump-banks) again and I'll program them into a battery and test it on a XO-1. No rush though I won't be able to do anything with this for at least 2 weeks when I back in Boston and working. Perhaps I'll think of some other thing to look at between now and then. -insert battery - ok bg-acr@ .bg-acr (no batman.fth/batman-start) commands like bg-acr@ require batman-start to work correctly. If batman-start has not been called then they will call it for you. We call it explicitly so that the charging system is disabled prior to inserting the battery. Booted up with battery, plugged AC, power LED stays red. This is an invalid condition. With AC connected you should either have: Blinking red: Error yellow (some say orange): Charging Green: Full If its not one of the above then either the EC charging system is disabled in which case the LED values are somewhat random or your power adapter is not providing power. Booted without battery, inserted battery, battery shows empty and charging. Charged to about 15% slowly, then jumped to 81% and then 97% in under 1 min and the power LED turned green! Now, you are going to say again that I do not know what I'm doing, but sure none of these looks very normal behavior to me and may have to do with how the battery communicates its state than its state per se. Yes and I'll continue to say it as long as you continue to do things that are invalid and will produce nonsensical results. I've told you a few times that when you run commands like bg-acr! that you are modifying important values outside of the EC and that until you do a full discharge/recharge cycle normal reporting won't yield valid results. The jumps are when the EC detects specific conditions and tries to reset the SOC accordingly. Normal and expected. If you want to understand whats going on the please run olpc-pwr-log so you can observe the voltage and current and see when the EC changes things based on those values. -- Richard A. Smith rich...@laptop.org One Laptop per Child ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: XO battery/performance [Devel Digest, Vol 76, Issue 21]
--- On Sat, 7/21/12, Richard A. Smith rich...@laptop.org wrote: Yes and I'll continue to say it as long as you continue to do things that are invalid and will produce nonsensical results. I've told you a few times that when you run commands like bg-acr! that you are modifying important values outside of the EC and that until you do a full discharge/recharge cycle normal reporting won't yield valid results. I'm sorry but I did not run any bg-acr! commands except the one you suggested. The only command that I run outside your suggestions is bg-acr@ .bg-acr with no batman.fth/batman-start first, which certainly can not account for the erratic behavior. You are certainly free to disregard whatever I say/describe, but can not justify it by inappropriate commands, because they were not any. All the commands issued are described precisely. I keep saying that the battery EC might have a problem and you just dismiss all the indications (like a full battery reporting as empty) including even the fact that EC reports the battery is asleep while the discharge data show that is not. Oh well, I do not think that one battery in a couple of millions worths all this trouble. Have a good trip. ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
[Server-devel] ReadySet Go: How A Simple Solar Power Pack Is Driving Wealth In The Developing World | Gadget Lab | Wired.com
http://www.wired.com/gadgetlab/2012/07/ready-set-go-how-a-simple-solar-power-pack-is-driving-wealth-in-the-developing-world/ From what I remember, these are the same guys who were doing the yoyo charger... Also reminds me of George Hunt's efforts of preventing the batteries from completely draining out...https://schoolserver.wordpress.com/2012/05/16/does-school-server-need-a-lead-acid-battery-interface/ cheers, Sameer ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
