Impossible to use the extended battery T420 extension

It is quite disconcerting to have the laptop stop and be empty when the battery life indicator said there is more than 6 hours of life left.

My T420 has a senior 55 + and 27 ++ long battery life.  If the main battery is used to power, when the main battery reaches 0%, it will fail to pass the long battery life and die.  It's not only to stop, it will stop.  Windows don't like this.  If the computer is using the extended battery for power, it can switch successfully to the main battery when the battery reaches 0%.

There seems to be no way 'approved' to force the first laptop using the extended battery.  I got this laptop a few weeks, but in my experimentation, the laptop uses preferably the battery with the lowest percentage of all.

For normal use, long battery life load profile I programmed to stop at 95%, this will get the laptop started on right stack when the two are connected, but not help if I'm out and on the use of the main battery and want to extend by adding the long battery life.

The only method I found to force the laptop to use the battery when the main battery is low-capacity must simply remove the main battery.  Of course, to do this, I have to either stop the laptop or the put it hibernates in.  Then, remove the main battery and attach the long battery life.  Reboot the laptop.  So far, I have no problems with this method. The laptop is perfectly happy with just 27 ++ battery attached.  But if I'm going to pass the batteries, I might as well have an extra 55 ++ lying around and waive the 27 ++.

Would be nice if Lenovo could provide instructions or a software patch that would allow me to tell the laptop to use preferentially the extended battery as soon as it is available.

The way the system is designed, it's that you won't always unload the 2nd battery first, not the main battery. If this is not the case, check the switch on the 2nd battery. Make sure it is in the position "on / green.

Tags: ThinkPad Notebooks

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