20
There is two types of lead-acid batteries, one is the vehicle battery to start the engine or to
supply electric power to the installed electric devices by repeatedly chage-discharge.
Another is the industrial
“
deep-cycle
”
battery to use with UPS, or power-operated vehicle
such as electric cart. This battery designed to be regularly deeply discharged using most of
its capacity by repeatedly recharging.
It is difficult to control the deep-cycle battery life, because there is an inverse correlation
between the depth of discharge (DOD) of the battery and the number of charge and
discharge cycles it can perform. And also, surrounding temperature should affect its
charging voltage or discharging condition.
SK-8550 has industrial battery test mode. You can check the battery condition by comparing
tested internal resistance with the initial one written on the battery. If you cannot find the initial
internal resistance, test the new battery first as per the steps from page 21.
※
Only 12V lead battery can be tested.
※
SK-8550 shows
”
Replace
”
test result when the tested resistance becomes double of the initial resistance, because
generally, the industrial batteries need replacement with this value. However, the actual good/bad threshold may differ
from batteries models. Please note this when replacing.
Electric cart
Inverse correlation of battery life
1800
1600
1400
1200
1000
800
600
0
50
60
70
80
90
100
Discharge amount affect the battery life. It should be shortened
rapidly by repeatedly deep discharging.
Depth of discharge (%)
INDUSTRIAL BATTERY TESTING
Adding initial internal resistance to
Favorites List is recommended for easy testing!
Number of charge (cycle)
Summary of Contents for SK-8550
Page 1: ...SK 8550 BATTERY CHECKER Technical Guidebook ...
Page 35: ...33 ...
