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we normally try to find out a few things about a battery (like charge level) before actaully applying charging power to it. when the battery is completely discharged, the controller on the battery can't respond as it is not self-powered. so, we have to avoid all operations that depend on the battery responding in the battery discovery/initialization path. as long as we report that a battery is present and it is not responsive, the charger task will enter ST_PRECHARGE which means it'll provide a "precharge" current to the battery to try to talk to it. this allows the battery's controller to report battery parameters allowing our charger task can do the right thing. BUG=b:79354967 BRANCH=none TEST=atlas now discovers the discharged battery reliably Change-Id: I5e5a3abda07508eb791b712fb2f9b9f5fe383e07 Signed-off-by: Caveh Jalali <caveh@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/1065492 Commit-Ready: Caveh Jalali <caveh@google.com> Tested-by: Caveh Jalali <caveh@google.com> Reviewed-by: Caveh Jalali <caveh@google.com>