Okayo GPA-680, User Manual

Maintenance

DO NOT put the unit in the sunshine for a long time, or any other hot, humid
environments  or  places  with  flame.  Stay  away  from  any  occasions  where 
situation  mentioned  above  might  occur.  Store  the  unit  in  general  indoor
temperature or in cool circumstance.

Avoid heat, humidity

Charge BEFORE you start using for the fist time

After unpacking the unit for the first time, please charge the unit for about
8  hours.  This  is  absolutely  necessary  as  the  built-in  rechargeable  battery
might have been discharged naturally due to long transportation and storage
time, even though it has been fully charged in the factory prior to shipment.
To  secure  a  longer  life  for  battery,  please  MUST  execute  this  IMPORTANT
process.

Charge fully

Ensure battery is fully charged BEFORE you store the unit. To remain a longer 
battery  life  and  better  performance,  make  sure  you  charge  the  battery 
regularly every month.

When you need to use the unit again after a long period of stogare,make
sure you charge if fully for at least 8 hours BEFORE any operation.
Please also charge this unit every time right after operation to secure a
longer battery life.

This  unit  has  DOD  (depth  of  discharge)  protection  design.  When  Power
Switch LED flashes red - which means there isn’t enough electricity (when
operating  via  the  battery’s  power  -  this  unit  will  turn  off  automatically  in 
a short time secure battery from deep-discharging damage. At this moment 
please immediately recharge your unit, do not continue with operation.

This unit has protection circuit against overcharge. The circuit will stop charging 
when battery is fully charged even power cord is plugged. 

Useful hint: You can still operate during charging.

Replacing battery

Make sure the substitute battery is in compliance with qualified specifications. 
Using incorrect battery may lead to explosion or malfunction.