ACDelco 78S Battery – Group 78 Silver
Our ACDelco 78S Battery is engineered with advanced Absorbed Glass Mat technology to deliver superior starting power for full-size trucks, SUVs, and performance vehicles. This Group 78 Silver series battery features enhanced vibration resistance and extended cycle life, making it the ideal choice for vehicles with high electrical demands.
We’ve designed the 78S to withstand extreme temperatures and provide reliable cranking amps when you need them most. Whether you’re powering aftermarket accessories or simply need dependable cold-weather starting, this AGM battery delivers consistent performance mile after mile.
- BCI Group Size 78 – fits most full-size trucks and SUVs (2005-2015 model years)
- 760 cold cranking amps (CCA) at 0°F for reliable cold-weather starting
- Absorbed Glass Mat (AGM) construction prevents acid leakage and spills
- Enhanced vibration resistance – up to 4x greater than conventional flooded batteries
- Recombinant technology reduces water loss and eliminates maintenance
Advanced AGM Construction & Technology
The acdelco 78s battery utilizes premium Absorbed Glass Mat construction, where electrolyte is absorbed into fiberglass mat separators rather than flowing freely between plates. This design eliminates the risk of acid leaks, even if the case becomes cracked, and allows the battery to be mounted at various angles without performance loss.
Our calcium-alloy grid technology reduces corrosion and extends service life compared to traditional lead-antimony grids. The valve-regulated recombinant design captures hydrogen and oxygen gases internally, converting them back to water through a chemical reaction. This process virtually eliminates water loss and eliminates the need for periodic maintenance checks.
Group 78 Sizing & Vehicle Compatibility
Group 78 batteries measure approximately 10.25 inches in length, 7 inches in width, and 7.5 inches in height, making them the factory-specified size for many full-size trucks and SUVs manufactured between 2005 and 2015. The acdelco 78s battery fits perfectly in models including Chevrolet Silverado, GMC Sierra, Cadillac Escalade, and select Ram and Ford F-Series variants.
Before installation, we recommend verifying your vehicle’s battery group size in the owner’s manual or checking the label on your existing battery. While Group 78 is physically similar to some other sizes, proper fitment ensures secure hold-down bracket installation and correct terminal orientation. The top-post terminals on this battery are positioned to match factory cable routing in Group 78 applications.
Cold Cranking Performance & Reserve Capacity
With 760 cold cranking amps at 0°F, the 78S provides ample starting power for gasoline engines up to 6.0 liters and diesel engines up to 4.5 liters. Cold cranking amps represent the discharge load in amperes that a fully charged battery can deliver for 30 seconds while maintaining at least 7.2 volts, making this specification the most critical measure of starting performance in cold weather.
The 110-minute reserve capacity rating indicates how long this battery can sustain a 25-amp discharge before voltage drops below 10.5 volts. This metric is particularly important if your alternator fails while driving, as it determines how long your vehicle can continue running on battery power alone. The robust reserve capacity of the acdelco 78s battery also makes it suitable for vehicles with significant aftermarket electrical accessories like winches, inverters, or upgraded audio systems.
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Common Questions About the ACDelco 78S Battery
The 78S is designed for vehicles requiring BCI Group Size 78 batteries, which includes most full-size Chevrolet Silverado, GMC Sierra, and Cadillac Escalade models from 2005-2015. It also fits select Ram 1500 and Ford F-Series trucks.
To confirm compatibility, check your owner’s manual or the label on your current battery for the group size. The 78S measures approximately 10.25″ × 7″ × 7.5″ and features standard SAE top-post terminals with positive on the left side.
No, this is a sealed AGM battery with valve-regulated recombinant technology that eliminates the need for adding water or checking electrolyte levels. The internal design converts hydrogen and oxygen gases back into water automatically, preventing fluid loss.
The only maintenance required is keeping terminals clean and ensuring your vehicle’s charging system operates within the 13.8-14.4 volt range during normal operation. Periodic visual inspection for damage or corrosion is recommended.
You should only use chargers with AGM-specific settings that limit voltage to 14.7 volts maximum. Standard chargers designed for conventional flooded batteries often exceed safe voltage limits for AGM construction and can damage the internal structure.
Modern multi-stage smart chargers with AGM modes work perfectly and help maximize battery life. If your charger lacks AGM settings, do not use it on the 78S, as overcharging will reduce performance and longevity.
Typical service life ranges from 4 to 7 years depending on climate, driving habits, and electrical system health. Vehicles in hot climates generally see shorter battery life due to accelerated chemical degradation, while cold climates stress batteries during starting but preserve overall capacity.
To maximize lifespan, maintain your alternator and voltage regulator in good condition, avoid frequent deep discharges, and use a maintenance charger if your vehicle sits unused for extended periods. Proper charging system voltage is critical for AGM battery longevity.
The acdelco 78s battery delivers 760 cold cranking amps at 0°F, providing reliable starting power for gasoline engines up to 6.0 liters and diesel engines up to 4.5 liters. This CCA rating represents the discharge load the battery can sustain for 30 seconds while maintaining minimum 7.2 volts.
This specification is particularly important in cold climates where engine oil thickens and requires more power to turn over. The 760 CCA rating ensures strong cranking even in harsh winter conditions.
While AGM construction allows more mounting flexibility than flooded batteries, we recommend installing the 78S upright in the standard position. The valve-regulated design prevents leakage at moderate angles, but upright mounting ensures optimal performance and longevity.
The sealed construction does make it safer than flooded batteries if the case cracks, as the absorbed electrolyte won’t spill freely. However, extreme mounting angles may affect warranty coverage and are not recommended for automotive applications.
This battery provides 110 minutes of reserve capacity, meaning it can sustain a 25-amp electrical load for 110 minutes before voltage drops below 10.5 volts. This specification is critical if your alternator fails while driving, as it determines how long you can operate on battery power alone.
The robust reserve capacity also makes the 78S suitable for vehicles with aftermarket accessories like winches, inverters, upgraded audio systems, or auxiliary lighting that draw power when the engine is off.