13
Charging
To charge the batteries plug the charger into the mains and connect to the instrument
using the USB cable supplied. Turn on the 765 by pressing any button briefly and
charging will start indicated by the red lamp to the left of the display.
The 765 needs to be on for charging to start but can be allowed to turn off while
charging continues.
When charging is complete the red lamp turns off.
Normal charge time for completely dead batteries is 3-4 hours.
The unit senses charging is complete by measuring the battery temperature. This can
be confused if the unit is moved from somewhere with a very different temperature to
the place where it is charged. If in doubt leave the 765 to warm up/cool down for 10
minutes before starting to charge.
Charging is only permitted between 0 and 40C (32-104F).
After charging completes further charging is not permitted until either:
• The unit is used for 5 hours.
• 5 Days have passed.
• The batteries are replaced.
• The time or date are changed by the user
The unit can be forced to start charging by pressing Set\Battery\Start
If the batteries get completely dead then they may need to be charged outside the unit
or replaced. With later firmware versions completely dead batteries can be charged.
Fast Charge
With firmware greater than V3.0, while charging is taking place the battery level
indicator is replaced by a + symbol, if the unit has hardware version greater than 9.9
and is connected to a high current charger it charges faster and “++” is displayed. The
fast charge can be disabled by pressing Set\Battery\Limit and re-enabled by pressing
Set\Battery\No Limit.
Battery Life
A fully charged set of GP “Recyko” 820mAH NiMH batteries will typically power a
unit for:
• 20 hours at maximum display brightness (2,400 30 sec readings)
• 33 hours at normal display brightness (4,000 30 sec readings)
• 120,000 log readings spread over 1 month
• 50,000 log readings spread over 1 year
• 2 years switched off (maintaining clock only)
These values may be affected by very low or high temperatures
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