Maybe you can set the values with the power manager and than disable it? The battery control is done by hardware/firmware and no program is required to be running for the settings to take effect. Unfortunately to my knowledge there's no other way under Windows than using the Lenovo Power Manager. I think it's quite awkward to boot two operating systems one after another just to set this option. I don't know yet what's happening when the system is shut down because my OS ever set the values again during boot. I can confirm that a complete battery rundown resets the values. According to Thinkwiki and my own tests booting Linux, setting the thresholds and rebooting to Windows works while keeping the set values. Because it's an API kept secret and unique to ThinkPads there are no generic implementations neither in other hardware brands nor different software tools (with tp_smapi being the only exception as an reverse-engineered implementation for Linux).įor years I've been using tp_smapi under Linux to set these values. So if you often switch between your desk and walking through your office building you won't keep your battery charging and discharging between 90 and 100%. Not only does it support a stop threshold (so your battery never exceeds e.g. It is actually possible to set charging thresholds on ThinkPads through a proprietary API once introduced by IBM.
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