Bosch BAT 155 User manual

BAT 155 Battery Tester Operating Instructions
(en-US)

en |2|Operating Instructions | BAT 155 Battery Tester
BAT 155 | REV. A | October 2020
Contents
1 Introduction 3
2 Safety Warnings and Instructions 4
3 Paper Loading 5
4 Before Testing Begins 5
5 Testing One Battery 6
6 Testing Multiple Batteries 7
7 System Test 8
8 Amp/Volt Meter Testing 11
9 Settings 12
10 Warranty Terms and Conditions 13

Operating Instructions | BAT 155 Battery Tester | 3|en
BAT 155 | REV. A | October 2020
Arrow Keys
Display Screen
(Home Screen)
Cover Lifter
Printer
Enter Key
Amp Clamp Jack Voltmeter Jack
USB Port
SYSTEM ANALYZER
1 Introduction
The BAT 155 Battery Tester is used to test 6 and 12 volt batteries, and to test
12 and 24 volt charging systems. (ONLY 12 volt for battery pack testing) The
suggested operation range is from 0 degrees Centigrade (32 degrees Fahrenheit)
to 50 degrees Centigrade (122 degrees Fahrenheit) in ambient temperature.

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| BAT 155 Battery Tester
2 Safety Warnings and Instructions
WARNING
This product can expose you to chemicals including arsenic, which
is known to the State of California to cause cancer. For more
information, go to www.P65Warnings.ca.gov.
CAUTION
Do not expose the tester to rain or snow.
} Working in the vicinity of a lead acid battery is dangerous. Batteries
generate explosive gases during normal operation. For this reason it is
important that you refer back to these instructions if you have any
questions on tool operation.
} To reduce risk of battery explosion, follow these instructions, those
published by the battery manufacturer, and the manufacturer of any
equipment you intend to use in the vicinity of the battery. Observe
cautionary markings on these items.
} Another person should be within range of your voice or close enough to
come to your aid when you work near a lead acid battery.
} Have plenty of fresh water and soap nearby in case battery acid contacts
skin, clothing, or eyes.
} Wear safety glasses and protective clothing.
} If battery acid contacts your skin or clothing, wash immediately with soap
and water. If acid enters your eye, immediately ood the eye with running
cold water for at least ten minutes and seek immediate medical attention.
} NEVER smoke or allow a spark or ame in vicinity of the battery or engine.
} Be extra cautious to reduce the risk of dropping a metal tool onto the
battery. It could spark or short-circuit the battery or other electrical parts
and could cause an explosion.
} Remove personal metal items such as rings, bracelets, necklaces, and
watches when working with a lead acid battery. These items can produce
a short-circuit current high enough to weld a ring or like to metal causing
a severe burns.

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Introduction | BAT 155 Battery Tester | 5|en
3 Paper Loading/Replacement
Do the following to load paper:
1. Connect BAT 155 to battery. (See Pg. 5 for connection instructions.)
2. Pull up the cover lifter to open the clear cover. (See Fig. 1) Insert a new
paper roll into the printer compartment with the leading edge coming out
from under the paper roll. Pull a short length of paper from the
compartment and press down the clear cover to close and snap in place.
Note: Tester will not print if cover is not snapped in place. (See Fig. 2)
Note: Replacement thermal paper rolls are available at most ofce supply
retailers. The paper is 2 1/4 in. wide, with a maximum roll length of 98 ft.
4 Before Testing Begins
1. Install/verify that there are 6 AA alkaline 1.5V batteries installed into the
tester battery chamber located on the back of the unit. Li-Ion or lithium
batteries are not recommended because of the initial 1.7 Volt output. When
the batteries are weak, the screen will display “POWER LOW.” Replace all 6
batteries at the same time. Note: Nothing will be seen on the display until
the tester is connected to a vehicle battery. Each time the tester is
connected to a battery, the tester will run a quick cable verication to
ensure a proper connection through the output cables to sensors in the
clamp jaws. If the connection checks out OK, the display will momentarily
ash and proceed to the Home Screen. In operation the tester will only
show three results: CHECK CLAMPS / VOLTAGE HIGH / VOLTAGE LOW.
2. Ensure that the area around the vehicle battery is well ventilated while the
battery is being tested.
3. Clean battery terminals. Be careful to keep corrosion from coming in
contact with your eyes.
(Figure 1) (Figure 2)

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5 Testing One Battery
CAUTION
Before testing a battery in a vehicle, turn off the ignition and all
accessories and loads. Close all vehicle doors and the trunk lid.
1. Ensure the battery terminals are clean. Wire brush them if necessary. Clamp
the red load lead to the vehicle positive battery terminal. Clamp the black
load lead to the vehicle negative battery terminal.
2. Use Arrow Keys to select Battery Test , then press the Enter Key .
3. Follow screen instructions to perform a battery test. Note: Answer “NO” to
the “Pack Test Prompt.” To cancel test procedure press and hold Left Arrow
Key .
INTERPRETING TEST RESULTS:
The battery is good and capable of holding a
charge.
The battery is good but needs to be recharged.
The battery will not hold a charge. It should be
replaced immediately.
TEST RESULT
GOOD & PASS
SOH:
SOC:
VOLTAGE:
TEST RESULT
GOOD & RECHARGE
SOH:
SOC:
VOLTAGE:
TEST RESULT
BAD & REPLACE
SOH:
SOC:
VOLTAGE:
4. Inspect the battery for cracked or broken case or cover. If the battery is
damaged, do not use the tester.
5. If the battery is not a sealed maintenance free type, add distilled water in
each cell until the battery acid reaches the level specied by the
manufacturer. This helps purge excessive gas from cells. Do not overll.
6. If necessary to remove battery from vehicle to test, always remove the
ground terminal from the battery rst. Make sure all accessories in the
vehicle are off to prevent arcing.

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Battery Testing | BAT 155 Battery Tester | 7|en
The battery may be serviceable but with
decreased capacity to start the engine. The
battery might fail under extreme climate condi-
tions or with a poor connection between the
vehicle and the battery to affect the charging
function. Possible battery replacement and/or
charging system analysis may be needed.
Battery is discharged. The battery condition
cannot be determined until it is fully charged.
Recharge and retest the battery.
The battery has at least one cell short circuit. It
should be replaced immediately.
6 Testing Multiple Batteries in a Vehicle
CAUTION
Before testing a vehicle with multiple batteries, turn off the ignition
and all accessories and loads. Close all vehicle doors and the trunk
lid.
Ensure the battery terminals are clean. Wire brush them if necessary. Leaving all
the batteries connected to each other, select one battery to connect the tester
to. Clamp the red tester lead to that battery’s positive terminal. Clamp the black
tester lead to the corresponding negative battery terminal.
Note: Battery pack testing can only be performed on 12V systems.
4. Select Battery Test , then press the Enter Key .
5. Follow screen instructions. Note: Answer “YES” to the pack test question. To
cancel test procedure press and hold Left Arrow Key .
6. Tester screen will turn red if there is an issue with one of the batteries and
individual battery tests will then need to be performed.
7. Before testing the individual batteries, disconnect all cables from the
batteries.
TEST RESULT
MARGINAL
SOH:
SOC:
VOLTAGE:
TEST RESULT
RECHARGE AND RETEST
SOH:
SOC:
VOLTAGE:
TEST RESULT
BAD CELL REPLACE
SOH:
SOC:
VOLTAGE:

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8. Determine the order in which the individual batteries will be read. The tester
screen will go blank between each individual battery test. It will record and
display the results in the order the batteries were tested. Reconnect the red
tester lead to the positive terminal, and the black tester lead to the negative
terminal of the rst individual battery to be tested. Follow the screen
instructions. Press the Enter Key to advance to the next screen.
9. Repeat step 7 for the remaining batteries.
INTERPRETING TEST RESULTS:
The battery is good and capable of holding a
charge.
The battery is good but needs to be recharged.
The battery will not hold a charge. It should be
replaced immediately.
7 System Test
CAUTION
Before testing a battery in a vehicle, turn off the ignition and all
accessories and loads. Close all vehicle doors and the trunk lid.
1. Ensure the battery terminals are clean. Wire brush them if necessary. Clamp
the black load lead to the vehicle negative battery terminal. Clamp the red
load lead to the vehicle positive battery terminal.
2. Use Arrow Keys to select System Test , then press the Enter Key .
NOTE: To cancel test procedure press and hold Left Arrow Key .
TEST RESULT
GOOD & PASS
SOH:
SOC:
VOLTAGE:
TEST RESULT
GOOD & RECHARGE
SOH:
SOC:
VOLTAGE:
TEST RESULT
BAD & REPLACE
SOH:
SOC:
VOLTAGE:

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Battery Testing | BAT 155 Battery Tester | 9|en
3. Follow screen instructions to check CRANKING VOLTS.
INTERPRETING TEST RESULTS:
The system is showing a normal draw. Press
the Enter Key to perform the charging
system test.
The cranking voltage is below normal limits,
troubleshoot the starter with manufacuturer‘s
recommended prodcedure.
Cranking voltage is not detected.
4. Follow screen instructions to perform a CHARGING SYSTEM TEST at Idle.
INTERPRETING TEST RESULTS:
The alternator is not providing sufcient cur-
rent to the battery. Check the belts to ensure
the alternator is rotating with engine running. If
the belts are slipping or broken, replace the
belts and retest. Check the connections from
the alternator to the battery. If the connection
is loose or heavily corroded, clean or replace the
cable and retest. If the belts and connections
are in good condition, replace the alternator.
The system is showing normal output from the
alternator, no problems detected. Press the
Enter Key to advance to the next screen.
The voltage output from the alternator to the
battery exceeds the normal limits of a functio-
ning regulator. Ensure all connections are tight
and that there is a good ground connection.
Altenator may need to be replaced.
CRANKING VOLTS NORMAL
CRANKING VOLTS LOW
CRANKING VOLTS NOT
DETECTED
ALT. IDLE VOLTAGE: LOW
ALT. IDLE VOLTAGE: NORMAL
ALT. IDLE VOLTAGE: HIGH

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5. Follow screen instructions to continue testing the CHARGING SYSTEM with
accessory loads.
INTERPRETING TEST RESULTS:
The system is showing a normal draw. Press
the Enter Key to continue testing the
charging system with accessory loads.
One or more diodes in the alternator are not
functioning or there is stator damage. Check to
ensure the alternator mounting is afxed secu-
rely and that the belts are in good shape and
functioning properly. If the mounting and belts
are good, replace the alternator.
The alternator is not providing sufcient cur-
rent for the system‘s electrical loads and the
current for the battery. Check the belts to
ensure the alternator is rotating with engine
running. If the belts are slipping or broken,
replace the belts and retest. Check the connec-
tions from the alternator to the battery. If the
connection is loose or heavily corroded, clean
or replace the cable and retest. If the belts and
connections are in good condition, replace the
alternator.
The system is showing normal output from the
alternator, no problem detected. Press the
Enter Key to advance to the next screen.
The voltage output from the alternator to the
battery exceeds the normal limits of a functio-
ning regulator. Ensure all connections are tight
and that there is a good ground connection.
Altenator may need to be replaced.
RIPPLE DETECTED:
NOT DETECTED
OR
NORMAL
RIPPLE DETECTED:
HIGH
ALT. LOAD VOLTAGE: LOW
ALT. LOAD VOLTAGE: NORMAL
ALT. LOAD VOLTAGE: HIGH

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System Test | BAT 155 Battery Tester | 11 |en
Press the Enter Key to display a summary of
the system test results. Press the Arrow Down
key to see remaining test results.
Press the Enter Key to print test results or
select NO to return to home screen.
8 Amp/Volt Meter Testing
NOTE: BAT 155 Battery Tester must be connected to vehicle battery.
1. Install a 9V battery in the Volt/Amp Meter.
2. Plug Amp meter into the Amp Jack on the BAT 155.
3. Use Arrow Keys to select Volt/Amp Test , then press the Enter Key
. NOTE: To cancel test procedure press and hold Left Arrow Key .
AMP METER TEST:
1. Press zero button on the Amp probe.
Ensure the display on the BAT 155
displays a zero.
2. Press the side button to open jaws and clamp
around a wire to be measured.
CRANKING VOLTAGE XXX
ALT. IDLE VOLTAGE XXX
RIPPLE VOLTAGE XXX
ALT. LOAD VOLTAGE XXX
PRINT RESULT
YES
NO
Button Zero
Power

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| BAT 155 Battery Tester
VOLT METER TEST:
1. Plug volt probe into volt meter jack on
BAT 155 Battery Tester.
2. Touch probe tip to an accessible metal test
point to measure voltage.
NOTE: Never check a system that is higher than 60 V.
Damage to BAT 155 could occur.
9 Settings
NOTE: BAT 155 Battery Tester must be connected to vehicle battery.
1. Use Arrow Keys to select Settings , then press the Enter Key .
2. Use the Arrow Keys to scroll down through the list below: Press the Enter
Key to select a setting category. Use the Arrow Keys to navigate the
options and press the Enter Key to lock in the selection. NOTE: To return
to the main settings screen press Left Arrow Key .
1. LCD BACKLIGHT
2. LANGUAGE SELECT
3. CLOCK
4. INFORMATION
5. TEST COUNTER
6. VERSION

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10 Warranty Terms and Conditions
Any battery tester found defective in material or workmanship within one year from
the date of purchase by a retail customer will be repaired or replaced according to
published defective return test repair procedures. The existence of a defect shall
be determined by the manufacturer in accordance with published warranty repair
procedures. The warranty repair procedures are available upon request.
This warranty does not cover any unit that has been damaged due to accident,
abuse, alternation, use for a purpose other than that for which it was intended, or
failure to follow operating instructions. This warranty is expressly limited to origi-
nal retail buyers. This warranty is not assignable or transferable. Proof of purchase
is required for all alleged claims. Warranty cannot be authorized without proof of
purchase. Warranty claims must be sent pre-paid with dated proof of purchase.
Damage incurred during shipment is the responsibility of the shipper (customer
returning unit) If the returned unit qualies for warranty, the shipper will only incur
shipping cost. The manufacturer reserves the right to substitute or offer alternative
warranty options at its discretion.
The sole and exclusive remedy for any unit found to be defective is repair or
replacement, at the option of the manufacturer. In no event shall the manufacturer
be liable for any direct, indirect, special, incidental, or consequential damages
(including lost prot) whether based on warranty, contract, tort, or any other legal
theory.
Return Goods
Pack with sufcient over-pack to prevent damage during shipment. Damage
incurred during return shipment is not covered under this warranty. Repair costs
for such damages will be charged back to shipper.
WHEN RETURNING GOODS, INDICATE “RETURN GOODS” ON ALL INVOICES AND
RELATED SHIPPING DOCUMENTS TO PREVENT ANY EXTRA CHARGE.

Bosch
Automotive Service Solutions, Inc.
655 Eisenhower Drive
Owatonna, MN 55060 USA
www.boschdiagnostics.com
PN 1699503014