Owon HDS272S User Manual page 43

Do not use any abrasive chemical cleaning agent to avoid damaging the
instrument or probe.
Warning: Please make sure the instrument is dry before re-energizing
to avoid electrical short circuit or personal injury caused by moisture.
Charging and Replacement of Battery
During the long-term storage of the device, the battery may be too low due to
the self-discharge of the lithium battery and the device cannot be turned on.
This is a normal phenomenon.
Please use the attached adapter to pre-charge the device for 0.5 to 1 hour (d
epending on the storage time) before turning it on. In addition, if the device is
not used for a long time, it is recommended to charge it at regular intervals t
o avoid over-discharge of the lithium battery.
Battery Charging
The lithium battery may not be fully charged when delivered. To make the
battery fully charged, it takes up to ≥4.5 hours (when the device is turned off)
or it is subject to the charging indicator. After charging, the battery can supply
power for about ≥4 hours.
The power supply and battery indicator symbols in the upper right corner of
the screen are explained as follows:
symbol indicates the power-on charging status;
symbol indicates battery power supply;
symbol indicates that there is only about five minutes of use time left.
Please charge as soon as possible according to the relevant tips to avoid
damage to the battery.
Charging Method
Charging the battery through the power adapter: Connect the oscilloscope to
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