Re (2): low battery shutdown
peter at easthope.ca
peter at easthope.ca
Mon Feb 22 16:06:37 EST 2016
From: Mike Dee <mikedee4 at gmail.com>, Mon, 22 Feb 2016 06:22:05 -0800
> contacts that electrically connect the battery to the
> laptop.* Dried green crystals have been spotted around the connector
> ... contacts that electrically connect the battery to the
> laptop.* Dried green crystals have been spotted around the connector ...
No sign of corrosion anywhere in or on the machine.
> *Perform an XO Full Reset <http://wiki.laptop.org/go/XO_Full_Reset>.*
No problem there. Brief orange flash is as described.
> *Disconnect the battery, and connect the laptop to AC power*. Now turn on
> the laptop. After the system has loaded, insert the battery.
> *Does the battery LED start flashing red?*
No. Just steady yellow indicating charging.
> *Does the battery LED start flashing yellow?*
Just steady yellow.
Within about 40 minutes, mousing over the battery icon at
the top of the screen shows 100% charge. The battery light
remains yellow for another 20 or so minutes. Then changes
> disconnect AC power and discharge the battery while the system is running,
> keeping an eye on the percentage charge.
> *Does the system shut down abruptly with over 10% of charge remaining?* If
Probably about 30%. Will do it again this weekend to verify the previous observation.
> Capacity test
From: James Cameron <quozl at laptop.org>, Tue, 23 Feb 2016 06:18:55 +1100
> If a couple of full charge and discharge cycles don't fix the
> inconsistency, the battery is close to end of usable life.
> I agree with Paul that power-logs will be useful if Peter wants to
> dive deeper into the technical causes.
Will continue with the tests and tips.
A battery specialty shop here in Vancouver made a nice job of
rebuilding a battery pack from an Epson HX-20. Might let
them have a go at this battery. If necessary will find a new
These machines are superbly durable. The battery pack will be the
first failure in most. A modular battery with a "standard" connector
might be considered in a future design. Recently I was given a
Duracell cylinder about 2 cm diameter with USB sockets on the end.
Should run many of little FPGA based machines.
Thanks! ... Peter E.
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