2016 Chevrolet Silverado 3500HD — Battery Size & Group

As an ASE-certified master technician, I’ve replaced countless batteries in heavy-duty trucks. The 2016 Chevrolet Silverado 3500HD is a workhorse, whether equipped with the 6.0L Vortec gas engine or the legendary 6.6L Duramax turbo-diesel. Because these trucks are often tasked with towing, plowing, and powering auxiliary equipment, having the correct battery setup is absolutely critical.

Here is the complete battery specification guide for the 2016 Chevy Silverado 3500HD.

Quick answer

If you are looking for the exact specifications for your 2016 Silverado 3500HD battery, here is what you need to know before heading to the parts counter:

• BCI group size: Group 48 (H6) or Group 94R (H7), depending on the specific engine and options.
• CCA rating (Cold Cranking Amps): 720 to 730 CCA minimum per battery.
• Reserve capacity: 115 to 140 minutes.
• AGM vs flooded requirement: The factory often equipped these with standard flooded lead-acid batteries, but upgrading to an AGM (Absorbent Glass Mat) is highly recommended for heavy-duty use.
• Terminal layout: Top post (Positive on the right side).
• Physical dimensions: Group 48/H6 (11.0" L x 6.9" W x 7.5" H) or Group 94R/H7 (12.4" L x 6.9" W x 7.5" H). Always measure your battery tray before purchasing, as heavy-duty GM trucks utilize slightly different trays based on the trim package.
• Dual-battery setup: If you have the 6.6L Duramax diesel, your truck utilizes a dual-battery setup wired in parallel. Always replace both batteries at the same time to prevent the older, weaker battery from draining the new one.

Replacement battery options

If your Silverado 3500HD is struggling to crank, here are a few highly rated, popular replacement options that fit this generation's battery trays. (Always verify your specific group size—H6 vs H7—before buying):

• ACDelco Gold 48AGM: The premium OEM-style replacement. Excellent fit, 760 CCA, and a robust AGM design.
• Interstate MTZ-48/H6: A premium AGM battery offering 730 CCA and outstanding reserve capacity for trucks with aftermarket accessories.
• DieHard Platinum AGM (Group 94R/H7): Offers 850 CCA for maximum starting power in extreme cold. Excellent for Duramax models using the larger H7 trays.
• Optima YellowTop DH6: A deep-cycle and starting AGM battery hybrid (800 CCA). Ideal if you run winches, plows, or heavy inverters.

AGM vs flooded — which does this vehicle need?

From the factory, many 2016 Silverado 3500HDs shipped with standard flooded batteries. However, you do not have to stick with a flooded battery. In fact, for a 1-ton truck, I strongly suggest upgrading to an AGM battery.

AGM batteries are completely sealed, spill-proof, and significantly more resistant to the heavy vibrations experienced on job sites or while towing. Furthermore, AGM batteries handle the parasitic draw of modern electronics much better and recharge faster. If you use your truck for snow plowing, heavy winching, or have a diesel engine that relies heavily on glow plugs in the winter, AGM is the clear winner.

Post-installation relearn / reset procedure

Unlike some European vehicles, the 2016 Chevrolet Silverado 3500HD does not require a complex Battery Management System (BMS) reset using a high-end scan tool. However, after disconnecting the battery, you should follow this basic relearn procedure:

1. Idle Relearn: Start the engine and let it idle in Park for 3 minutes. Then, turn on the A/C and let it idle for another 3 minutes to allow the throttle body to relearn its idle trim.
2. Power Windows: If your truck features express up/down windows, roll the window all the way down and hold the switch for 2 seconds. Roll it all the way up and hold the switch for 2 seconds. Repeat for each window.
3. Clock and Radio: You will likely need to reset your radio presets and the clock on the infotainment screen.

Signs of a failing battery

Don't wait until you're stranded at a job site. Watch out for these common warning signs:

• Slow, sluggish engine crank, particularly on cold mornings.
• Clicking noises when turning the key, but the engine won't turn over.
• Dimming headlights or interior lights when heavy electrical loads (like the heater blower or power windows) are activated.
• Check Engine or Battery Light illuminated on the dash.
• "Service Trailer Brake System" warning: Weak voltage can cause spurious warning messages in GM heavy-duty trucks.

Common battery issues for this generation

For the 2016 HD Silverados, particularly the Duramax diesels, the most common issue we see in the shop is failure of the battery crossover cable. Because diesel trucks run two batteries, a high-resistance (corroded) crossover cable can cause one battery to overcharge while the other undercharges, leading to premature failure of both. Always inspect the terminals and the crossover cable for internal green corrosion when replacing the batteries.

Gas trucks often suffer from phantom electrical draws caused by aftermarket accessories (like poorly wired light bars or trailer brake controllers) draining the battery overnight.

Find a trusted shop on Repairius.