PowerWalker VFI 1000 LE - Manual (Page 21)

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3.5 Charge the batteries
1) After the UPS is connected to normal mains, the charger will work and
charge the batteries automatically in bypass mode or line mode.
2) Suggest charging the batteries for 10 hours before use. Otherwise the
backup time may be less than the standard value.
3.6 Discharge the batteries
1) When the UPS is in battery mode, the buzzer will beep according to
different battery level. If the battery voltage drops to the alarming level, the
buzzer will beep hurry (once every sec) to remind the user that the battery
is low level and the UPS will be shutdown automatically soon. The user
could switch off some non-critical loads to avoid the shutdown alarming
and prolong the backup time. If have no more load to be switched off at
that time, you have to shutdown all loads as soon as possible to protect
the loads or save data. Otherwise there is the risk of data loss or load
failure.
2) In battery mode if the user don’t like the buzzer noise, the beep could be
muted by short-press the button.
3) The backup time of the long backup time model is dependent on the
external battery capacity except the load capacity mainly.
4) The backup time may vary from different environment temperature and
load type.
3.7 Test the batteries
1) If you need to check the battery level or aging status when the UPS is
running on normal mode (line mode), you could short-press the button to
let the UPS transfer to battery test mode.
2) To make the system more reliable, the UPS will perform the battery test