Lenovo ThinkPad 1838 User Manual page 38

Figure 7. Connecting the ac charger with the tablet
3. Plug the ac charger into a standard ac power outlet.
4. Disconnect the ac charger from your tablet when the battery power is full, or leave the ac charger
connected to operate from ac power.
Alternatively, you can use any of the following charging methods to safely recharge the internal battery of
your tablet:
Charging method
ThinkPad Tablet Dock (fastest
charging method)
ThinkPad Tablet AC Charger
ThinkPad Tablet DC Charger
A USB connection between the
micro-USB connector on the tablet
and a USB connector of a personal
computer or other device that
complies with the USB 2.0 standards
(slowest charging method)
Attention: Use only Lenovo approved chargers. Unauthorized chargers could cause severe damage to
your tablet.
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User Guide
Tablet on
(Display is on)
Approved
Approved, but the battery will charge
slowly
Approved, but the battery will charge
slowly
Might not charge due to USB 2.0
power limits.
If the power consumption of the tablet
exceeds USB 2.0 power limits, the
battery will discharge to compensate
for the additional power required by
the tablet.
Tablet off or in screen lock mode
(Display is off)
Approved
Approved
Approved
Approved