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Testing a Battery for a Short or Open Cell

The Battery Life Saver™ electronic device will not help a battery or batteries that have an open or shorted cell. In order to tell if a battery as an open or shorted cell, simply perform the following test.


Step 1: Make sure you turn off any instruments or accessories that will drain the battery or battery system during testing.


Step 2: Charge the battery or battery system until it is fully charged .


Step 3: If the system has multiple batteries connected, we recommend to disconnect them from each other to get an accurate reading. Apply a load to the battery or battery system for at least one hour (or let them sit for 8 to 12 hours). This important because if you measure the voltage immediately after charging, you will not be measuring the true voltage of the battery. 


Step 4: With a voltmeter, measure the voltage of each individual battery.


Step 5: Reference the chart below to determine if your battery or battery system has a shorted or open cell. For example, if a 6 volt battery is reading below 4.3 volts it has an open or shorted cell and the battery must be replaced.

Battery Voltage Reading of Short or Open Cell
6 volt 4.3 volts or below
8 volt 6.5 volts or below
12 volt 10.7 volts or below

If you have been using the BLS or plan in using one you will only need to replace the bad battery with another used battery (or a new battery if necessary). Now you are ready to start using the BLS… .


If you have any questions about this procedure, please call 727-446-8400


Vector Products Customer Service:

Phone: 1 (800) 618-5178

For Vector Products Support and Customer Service, please contact Black & Decker at 1-800-618-5178. Select the "Customer Option", then state the word "Operator" to speak to someone quickly. Their hours are 8 a.m. to 4 p.m. EST.

Battery Life Saver

Email: bls @ batterylifesaver.com
Phone: (727) 446-8400
Toll Free: 866-301-8835
Fax: (727) 446-8900
936 Cleveland St. Unit C, Clearwater, FL 33755

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