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Battery Tester

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A Battery Tester is an electronic device intended for testing the state of an electric battery, going from a simple device for testing the charge actually present in the cells and/or its voltage output, to a more comprehensive testing of the battery's condition, namely its capacity for accumulating charge and any possible flaws affecting the battery's performance and security.

Simple battery tester

The most simple battery tester is a DC ammeter, that indicates the battery's charge rate.[1] DC voltmeters can be used to estimate the charge rate of a battery, provided that its nominal voltage is known.[2]

Integrated battery testers

There are many types of integrated battery testers, each one corresponding to a specific condition testing procedure, according to the type of battery being tested, such as the [421" test for lead-acid vehicle batteries.[3] Their common principle is based on the empirical fact that after having applied a given current for a given number of seconds to the battery, the resulting voltage output is related to the battery's overall condition, when compared to a healthy battery's output.[4]


The features of each OBD code reader depends on the make and model.

However, it is common for most readers to have:

LCD screen readouts

View diagnostic trouble codes (DTC's)

Ability to reset / clear DTC codes

Get "snapshot" data so you can view what was going on when the code was triggered

Higher-end OBD code readers can have more advanced features such as:

Languages other than English

Code definitions right on the unit

Display freeze frame data


OBD-II code readers vary in price.

They range from an affordable price ($85) to many hundreds of dollars, or more.


More Information:

If you're interested in getting more information on OBD-II code readers or are interested in purchasing one,

check out complete list of Frequently Asked OBD Questions, and also the ads throughout this site.

Some brand names of OBD readers are Carsara, Cartrend, Actron, Innova, etc.

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