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Technical Service Bulletin DATE MODEL(S)
DECEMBER, 2013 |SONATA, ELANTRA
SUBJECT: ABSORBENT GLASS MAT (AGM) BATTERY
Description:

Starting with the 2014 model year, there are two types of batteries installed on Hyundai vehicles:
Conventional Flooded (wet cell) type and Absorbent Glass Mat (AGM) type.
Although the battery external appearances are similar, the internal construction and characteristics of

factory.

battery.

The replacement battery must be the same type of battery originally installed from the

The correct battery type, either Flooded or AGM, must be selected for the GR8 Testing
and Charging to ensure correct results.

Charging with an incorrect battery type selection will damage and shorten the life of the

Always check the battery specification label affixed on top of the battery before working
on the battery and be sure to select the appropriate battery type.

Applicable Vehicles:
Sonata YF 2.4L: 2014

Elantra (UD/MD) 1.8L with Automatic Transmission: 2014

Warranty Information:
Normal warranty applies.

Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service

Advisors, Technicians, Body Shop Manager, Fleet Repair
SO | | ABSORBENT GLASS MAT (AGM) BATTERY

Example of Sonata AGM Battery Specification Example of Sonata Flooded Battery Specification
Label Label

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Alabama, LLC
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CMF68L-BCI 68Ah(20HR) 600CCA(SAE)
12V 10RG 480A (EN)

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Example of Elantra AGM Battery Specification Example of Elantra Flooded Battery Specification
Label Label

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CMF6OL-DIN 60Ah(20HR) 550CCA(SAE)
12V 92RC 440A (EN)

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120RC 608A (EN)

AGM batteries used in Hyundai vehicles are flat plate style and the case resembles that of a
conventional flooded battery.

The AGM battery uses a fiberglass mat separator that is wrapped around the positive plates and
holds the electrolyte in place with capillary action.

The battery cells consisting of the lead plates, electrolyte, and fiberglass mat are tightly packed into
the case partitions. This tight packing or compression holds the electrolyte absorbed in the glass
matting resulting in a battery that is spill proof, impact and vibration resistant. As a result, it has very
low internal resistance.

The lower internal resistance increases the voltage output, decreases charging time, and reduces
losses to heat as power flows through the battery.

TSB #: 13-EE-004 Page 2 of 3

Sched ABSORBENT GLASS MAT (AGM) BATTERY

In general, AGM batteries may provide a longer service life than conventional flooded batteries.

Key benefits of AGM batteries:

» 3 times higher cycle capability
Higher deep discharge capability
Faster current delivery
Faster charge capability
Low self-discharge
Maintenance Free
Low / No gas output
Spill proof

The AGM battery is sensitive to overcharging and heat. Severe overcharging can damage and
deform the battery.
= Always use a voltage regulated battery charger (The GR8 battery tester/charger has AGM
battery settings).
= Never allow the battery temperature to exceed 125°F during charging.
» Immediately stop charging any battery that becomes very hot or makes hissing noises.

When testing or charging an AGM battery using the Midtronics GR8 Diagnostic Battery
Tester/Charger, it is important to select the correct battery type in the setup menu. The GR8 will
configure the optimum voltage and current charge rates for the type of battery that is selected.

Refer to TSB 13-EE-003 for more details on how to use the GR8 Battery Tester.
The latest Battery Application Guide can be found at:

http://www. hyundaiflashdrive.com/storage/reference-material/pn-reference-
charts/battery app quide.pdf

TSB #: 13-EE-004 Page 3 of 3