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#  

WARNING!

Ensure you read, understand and apply the safety and operational instructions before

applying the tester probes to the battery. Only when you are sure that you understand the procedures is it
safe to proceed with the testing process.

3.1.

Preparation 

3.1.1.  Check battery casing for cracks or leakage and confirm that it is 12 volts.
3.1.2. Clean battery terminals. 
3.1.3. If possible, check electrolyte levels and top up with distilled water as necessary.

#

WARNING! 

Ensure vehicle, or battery, is in a well ventilated area before starting to test.

3.1.4. Remove the caps from the ends of the probes, press one probe to the positive (+) battery terminal and the 

other probe to negative (-) terminal. Note that this tester is not polarity sensitive. If the pointer does not 
move, either there is a bad connection

or

the battery is completely dead.

3.1.5. Note the meter reading, remove the tester from the battery and re-fit the caps to the end of the probes.
3.1.6. Refer to the chart below for diagnostics.

3.

OPERATION   

BATTERY CONDITION

METER READING

ACTION NECESSARY

1.  Battery fully 

Needle will indicate approximately 9 volts and will remain 

charged and

steady in this position.  

Note:

Smaller capacity or ‘Economy’

healthy.

batteries may read 7 or 8 volts.  Very heavy duty batteries 
may read a steady 10 or 11 volts.

2.  Battery healthy

Needle will indicate as above but will drop away steadily to  

This condition should

but discharged.

3 volts and remain there.

be checked by the use
of a hydrometer and 
battery should be 
removed, re-charged 
and re-tested.

3. Faulty cell*

Needle will indicate approximately 9 volts and drop rapidly to  Battery should be 
approximately3 volts and remain there or rise  slowly to 

replaced.

approximately 6 volts.

4.  Shorted cell(s)

Needle will indicate zero volts and then rise to approximately  Battery should 
6 volts and remain there.

be replaced.

* Condition indicated in 3 & 4 may cause suspect cell to “Boil”.

For Jack Sealey Ltd. Sole UK importer of Sealey Power Products.

Declaration of Conformity  

We, the sole UK importer, declare that the products listed below are in

conformity with the following standards and directives.

The construction files for these products are held by the Manufacturer and may be inspected, by a
national authority, upon request to Jack Sealey Ltd.

12V Battery Tester

Model: BT91/3

89/336/EEC EMC Directive

93/68/EEC CE Marking Directive

Signed by Mark Sweetman

17th September 2006

BT91/3 -2 - 200906

#  

WARNING!

Ensure you read, understand and apply the safety and operational instructions before

applying the tester probes to the battery. Only when you are sure that you understand the procedures is it
safe to proceed with the testing process.

3.1.

Preparation 

3.1.1.  Check battery casing for cracks or leakage and confirm that it is 12 volts.
3.1.2. Clean battery terminals. 
3.1.3. If possible, check electrolyte levels and top up with distilled water as necessary.

#

WARNING! 

Ensure vehicle, or battery, is in a well ventilated area before starting to test.

3.1.4. Remove the caps from the ends of the probes, press one probe to the positive (+) battery terminal and the 

other probe to negative (-) terminal. Note that this tester is not polarity sensitive. If the pointer does not 
move, either there is a bad connection

or

the battery is completely dead.

3.1.5. Note the meter reading, remove the tester from the battery and re-fit the caps to the end of the probes.
3.1.6. Refer to the chart below for diagnostics.

3.

OPERATION   

BATTERY CONDITION

METER READING

ACTION NECESSARY

1.  Battery fully 

Needle will indicate approximately 9 volts and will remain 

charged and

steady in this position.  

Note:

Smaller capacity or ‘Economy’

healthy.

batteries may read 7 or 8 volts.  Very heavy duty batteries 
may read a steady 10 or 11 volts.

2.  Battery healthy

Needle will indicate as above but will drop away steadily to  

This condition should

but discharged.

3 volts and remain there.

be checked by the use
of a hydrometer and 
battery should be 
removed, re-charged 
and re-tested.

3. Faulty cell*

Needle will indicate approximately 9 volts and drop rapidly to  Battery should be 
approximately3 volts and remain there or rise  slowly to 

replaced.

approximately 6 volts.

4.  Shorted cell(s)

Needle will indicate zero volts and then rise to approximately  Battery should 
6 volts and remain there.

be replaced.

* Condition indicated in 3 & 4 may cause suspect cell to “Boil”.

BT91/3 -2 - 200906

01284 757500

01284 703534

[email protected]

Sole UK Distributor
Sealey Group,

Bury St. Edmunds, Suffolk.

www.sealey.co.uk

Web

email

NOTE:

It is our policy to continually improve products and as such we reserve the right to alter data, specifications and component

parts without prior notice.

IMPORTANT: 

No liability is accepted for incorrect use of product. 

WARRANTY: 

Guarantee is 12 months from purchase date, proof of which will be required for any claim. 

INFORMATION: 

For a copy of our latest catalogue and promotions call us on 01284 757525 and leave your full name and

address, including

postcode.

For Jack Sealey Ltd. Sole UK importer of Sealey Power Products.

Declaration of Conformity  

We, the sole UK importer, declare that the products listed below are in

conformity with the following standards and directives.

The construction files for these products are held by the Manufacturer and may be inspected, by a
national authority, upon request to Jack Sealey Ltd.

12V Battery Tester

Model: BT91/3

89/336/EEC EMC Directive

93/68/EEC CE Marking Directive

Signed by Mark Sweetman

17th September 2006

01284 757500

01284 703534

[email protected]

Sole UK Distributor
Sealey Group,

Bury St. Edmunds, Suffolk.

www.sealey.co.uk

Web

email

NOTE:

It is our policy to continually improve products and as such we reserve the right to alter data, specifications and component

parts without prior notice.

IMPORTANT: 

No liability is accepted for incorrect use of product. 

WARRANTY: 

Guarantee is 12 months from purchase date, proof of which will be required for any claim. 

INFORMATION: 

For a copy of our latest catalogue and promotions call us on 01284 757525 and leave your full name and

address, including

postcode.

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