Dual battery replacement

[MBenm]

I'm really sorry if I could have found my answer somewhere on the forum  but after searching I thought I would ask.  I have a 2019 Chev Silverado Duramax.  On of the batteries is testing at only holding about 70% of its full charge (engine cranking is getting slower).  The other is testing at 98%.  I am thinking it is time to replace the 70% battery and wondered if i need to replace both at the same time. Also, do they have to be a matched pair (cca / amps etc).  Thank you in advance for your help.

[Steve-2019]

8 minutes ago, MBenm said:

I'm really sorry if I could have found my answer somewhere on the forum  but after searching I thought I would ask.  I have a 2019 Chev Silverado Duramax.  On of the batteries is testing at only holding about 70% of its full charge (engine cranking is getting slower).  The other is testing at 98%.  I am thinking it is time to replace the 70% battery and wondered if i need to replace both at the same time. Also, do they have to be a matched pair (cca / amps etc).  Thank you in advance for your help.

 

Welcome to GM-Trucks forum!

 

As a former Duramax 2500 owner (2004 & 2014) it does sounds as though you may have a bad battery. 

Did you have both batteries load tested?  Yes, it is recommended to replace both of them at the same time.

[redwngr]

 

 

HD gas and diesel don't use the same batteries.

 

Article link:

https://gm-techlink.com/?p=14946 

 

Link to the chart:

https://gm-techlink.com/wp-content/uploads/2021/06/TechLink-Battery-Ratings-2019-2022-062021A.pdf

 

 

Article, but I think it is necessary to go to either the article link or the chart link to see the chart details:

2022 OE Battery Ratings Chart

June 29, 2021

An updated Original Equipment (OE) Battery Ratings chart, with added specs for 2022 models, is now available for use when testing batteries using the EL-50313 GR8 Battery Tester/Charger and EL-52800 Diagnostic Charge Battery Station (DCBS). The chart includes cold cranking amperage (CCA), amp hours (AH) and reserve capacity (RC) ratings as well as battery type specifications for the 2019-2022 model years. (Fig. 7)

 

Fig. 7

 

Correct battery CCA ratings and battery type are critical for proper test results. Access to the battery label, which contains the OE CCA rating and battery type, may be difficult on some models, depending on the battery location. Using the updated chart can help when setting up a proper battery test for the OE battery. If the original battery in the vehicle has been replaced, the OE information in the battery chart may not match the battery currently installed in the vehicle.

For more information on replacement batteries, refer to the Electronic Parts Catalog.

Refer to the appropriate Service Information for details on proper battery testing. Go to General Information > General Information > Specifications > 12 Volt Battery Usage.