When a battery is inserted into the tester, it completes a circuit, which releases both the current and the voltage from the battery, allowing electricity to flow around the circuit in the battery tester. When it falls, the battery tester will indicate the battery is low or needs replacing.įor more information on electricity and voltage, see: Wonkee Donkee’s lesson on electricity and How can electricity be detected and tested Every battery will come with a voltage reading for instance, a non-recyclable, alkaline AA battery has a voltage of 1.5v.įor a battery to be working at its best, the voltage should be at the value stated or slightly above. The inner workings of an analogue battery testerīattery testers rely on the voltage of the battery, which is the electrical potential difference between two points. Digital battery testers are not as effective as their analogue counterparts because of this. See below for more information.ĭigital battery testers need a battery to function and do not include the resistor, which is what measures the battery under load on an analogue tester. This gives a more accurate picture of the battery’s remaining life. However, they work slightly differently: analogue battery testers measure batteries under load, which means they test the batteries as if they are in use. They are used in similar ways, only the display is slightly different the digital one using an LCD screen with bars as indicators and the analogue using a needle dial. There are both analogue and digital battery testers available. How do the analogue and digital battery testers differ? This is not referring directly to the power as in the wattage, as battery testers work by testing current or voltage output. Additionally, there are no complicated measurements to interpret – the battery tester will simply tell you whether a battery is worth using or needs to be disposed/ replaced.Ī battery tester’s product spec should state that the device tests the ‘power’ remaining in batteries. High voltage load test safety trip at 13Vįast 10 second load tests (2 min wait between tests).Battery testers are one of the electrical tools that can be used by anyone, as they do not deal with exposed sources or high levels of electricity. Indicates extent of battery sulphation / battery condition. Split down to 12V sections for test.īattery from 200 - 1000 cold cranking (CCA) Suitable for 1 x 12V battery per test, for 24-36V or larger simply split the battery bank. Specifications Heavy duty leads and clamps The unit can also be used to measure the performance of the charging device (alternator / battery charger) - to inform the user whether the charging device is good, weak or bad. The unit will inform you if the battery is good, weak or bad. To test simply connect the unit to a 12V fully charger battery, adjust the CCA (cold cranking amps) on the screen up to 999A, then press the load button and perform the 10 second test. This is why it is crucial to ensure the batteries are fully charged before the test is performed to eliminate that possibility. If the battery is unable to deliver the load (and sustain it for this time frame) then the battery is either defective or simply not fully charged when the test was performed.
The battery should be able to deliver this load and hold the voltage up at the same time. Depending on the size of the battery, this product adds a very high load to the battery (125 A). You need to test the voltage of the battery under a heavy load condition.
I.e the voltage could show the battery is fully charged but the battery could be badly sulphated and useless.
Then, there is the ability of the battery to hold and deliver the power it has stored. A battery test has 2 aspects to it: There is the voltage of the battery (which is a rough indication if the battery is fully charged). Simply measuring battery voltage is not a true indication of the state of a battery. Digital battery tester, includes alternator and starter motor tests.
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