TIPS FOR USING THE BATTERY EXTRA
The BE is fitted with a low voltage cut of switch. When in the on position it is designed to turn off
the unit at around 11.7 to 11.9 volts and depending on the model of Battery Extra, at multiples of
this voltage i.e. a 24 volt battery will cut of at around 23.5 volts and 48 volt battery will cut of at
around 47.00 volts. This means that when left on an unattended battery or battery pack the BE
cannot over discharge the batteries.
When reviving old batteries it is often an advantage to allow the voltage to drop below the cut off
value when cycling the battery, to do this just put the cut off switch into the off position.
It can be difficult to see the improvement in batteries when using the BE. A good way to check for
improvements when reviving batteries is to check the run time. Example charge a 12 volt battery
with the BE connected until fully charged, then attach a load to the battery, say a bulb or other
item that will drain the battery, measure how long the battery takes to reach a fixed voltage, say
10.5 volts. Repeat the process and note any improvement in run time, continue until you get no
more improvement. If you have a new battery you can run a side by side comparison, to get an
indication capacity against the revived battery.
We often get call from people who have fitted the BE to a new set of batteries and they tell us that
they cannot see any improvement in their battery capacity. Sorry but the Battery Extra will not
make batteries better than new.
Should you see ERR on the voltage display, this means you have exceeded the maximum voltage
for the model you are using, this will not damage the unit but it will not work.
If you require any technical help please contact us by phone, on
020 8743 2267
or by email at
