GMC Sierra EV Battery: Complete Guide
The GMC Sierra EV battery comes in three Ultium sizes — Standard Range (about 119 kWh usable, 283 miles EPA), Extended Range (170 kWh, up to 410 miles) and Max Range (205 kWh, 478 miles EPA) — the largest battery packs fitted to any production pickup truck. Charging peaks at 350 kW on the Max Range pack, adding up to 100 miles in about 10 minutes, and the truck can export up to 10.2 kW of power for tools, equipment or home backup. This guide covers each pack’s size, chemistry, range, charging speeds, lifespan, warranty and replacement cost, and compares the Sierra EV with the Silverado EV, Rivian R1T and Tesla Cybertruck.
Quick answer
The GMC Sierra EV uses GM’s Ultium battery in three sizes: a 14-module Standard Range pack (about 119 kWh usable, 283 miles EPA), a 20-module Extended Range pack (170 kWh, up to 410 miles) and a 24-module Max Range pack (205 kWh, 478 miles — the longest EPA range of any electric pickup). All three use NCMA pouch cells from Ultium Cells, the GM–LG joint venture, in every trim. GM warranties the pack for 8 years or 100,000 miles and replaces it if capacity falls below 75%.
Key figures:
Packs ~119 / 170 / 205 kWh usable · EPA range 283-478 miles · DC peak 220 / 300 / 350 kW by pack · Max towing 12,500 lb (Extended Range pack) · Warranty 8 years / 100,000 miles, 75% floor
GMC Sierra EV Battery: 2026 Lineup Overview
| Battery Pack | Capacity | Modules | Range | DC Rate | Available Trims | Price from |
|---|---|---|---|---|---|---|
| Standard Range | ~119 kWh usable | 14 modules | 283 miles EPA | 220 kW | Elevation, Denali | $64,495 |
| Extended Range | ~170 kWh | 20 modules | 390–410 miles | 300 kW | Elevation, AT4, Denali | ~$71,000 |
| Max Range | ~205 kWh | 24 modules | 478 miles EPA | 350 kW | AT4, Denali | $91,695+ |
Ultium Platform: The GM Battery Architecture
The Sierra EV is built on GM’s Ultium battery platform — the same modular architecture used in the Chevy Silverado EV, Cadillac Escalade IQ, Hummer EV, and Blazer EV. The Ultium platform’s modular design allows GM to stack 14, 20, or 24 modules to create three distinct battery sizes. The 800V electrical architecture enables the 350 kW peak DC charging rate. NCMA (Nickel-Cobalt-Manganese-Aluminium) chemistry is used across all Sierra EV packs — similar to the chemistry in the Chevy Silverado EV’s large battery.
Every Sierra EV trim uses the same chemistry — NCMA (nickel cobalt manganese aluminum) — including the Elevation; only the module count changes between packs. The cells are large-format pouch cells built by Ultium Cells, the GM–LG Energy Solution joint venture, at plants in Ohio and Tennessee. One nuance: the Standard Range pack is a lower-voltage design (about 475V), which is why it charges more slowly than the 800V-class Extended and Max Range packs.
478 Miles: The Max Range Record
The Max Range pack’s 478-mile range is the headline figure of the Sierra EV lineup. That 478-mile figure is now the EPA-published rating for the 2026 truck, not just a GM estimate, and it is the highest range of any electric pickup on sale in the US. The 2025 model’s equivalent was 460 miles; the 2026 pushes further through efficiency improvements. The Extended Range pack at 410 miles EPA (Elevation trim) is the more practical choice for most buyers given its lower price and lighter weight advantage for towing.
350 kW Charging: 116 Miles in 10 Minutes
| Method | Power | Standard (120 kWh) | Extended (170 kWh) | Max (~205 kWh) |
|---|---|---|---|---|
| Level 2 AC (11.5-19.2 kW) | 11.5-19.2 kW | ~7-11 hours full | ~10-15 hours full | ~11.5-18 hours full |
| DC Fast | 220-350 kW by pack | ~24 min (10–80%) | ~30 min est. | ~35 min est. |
GM does not publish an official 10-80% charging time; the times above are estimates consistent with independent testing. Peak rates differ by pack — 220 kW for Standard Range, 300 kW for Extended Range and 350 kW for Max Range — and GMC quotes up to 100 miles of range added in about 10 minutes, or around 116 miles for the Denali Max Range.
Energy Transfer Pro: 10.2 kW Mobile Power
The Sierra EV offers Energy Transfer Pro — exporting up to 10.2 kW through 240V and 120V outlets in the truck bed. This powers heavy-duty job site tools, camping appliances, or acts as home backup during power outages. Super Cruise hands-free highway driving is standard on all trims. CrabWalk (4-wheel steering for diagonal movement) aids parking and off-road maneuvering. The AT4 adds 2 inches of extra ground clearance and 35-inch all-terrain tires for serious off-road use. The full 10.2 kW Pro system comes on AT4 and Denali trucks; the Elevation trim gets a smaller 7.2 kW Energy Transfer system instead.
Battery Warranty
GM covers the Sierra EV battery with an 8-year / 100,000-mile warranty. Three years of complimentary Ultium Charge 360 network access is included — aggregating Electrify America, Shell Recharge, IONNA, and other networks in one account. Annual NCMA degradation is approximately 1.5–2% per year based on Ultium platform data from the Silverado EV and Hummer EV. The 800V architecture’s lower current draw during charging supports long-term cell longevity. If a pack’s capacity falls below 75% of its original value during the warranty period, GM’s warranty terms provide for repair or replacement, as verified by a certified GM dealer — a higher threshold than the 70% many brands use.
How Long Does a GMC Sierra EV Battery Last?
GM does not publish a lifespan figure for the Sierra EV battery, but the evidence points to a long service life. In Geotab’s study of more than 22,700 electric vehicles, the average EV battery loses about 2.3% of its capacity per year — roughly 82% remaining after eight years. The Sierra EV’s NCMA chemistry, liquid cooling and large protective buffers should keep it at or better than that fleet average under normal use, and the pack’s sheer size means each mile driven uses a smaller fraction of its capacity than in a smaller EV.
Two ownership questions come up often. The battery cannot be upgraded after purchase: a Standard Range truck cannot be converted to Extended Range later, because the module count is fixed when the truck is built. And to tell which pack a truck has, check the window sticker or the original build sheet for its range rating — 283 miles means Standard Range, 390-410 miles means Extended Range, and 478 miles means Max Range.
GMC Sierra EV Battery Replacement Cost
GM does not publish a consumer price for a Sierra EV replacement battery, and no official figure exists. Based on the pack’s size — up to 205 kWh, among the largest in any production vehicle — and the roughly $190-per-kWh cost benchmark from GM’s Bolt battery recall program, a full out-of-warranty replacement would plausibly cost $20,000-$38,000. In practice almost no owner pays that: the pack is covered for 8 years or 100,000 miles, GM dealers can replace individual modules instead of the whole pack, and our EV battery replacement cost guide tracks what is known model by model.
Sierra EV vs Electric Truck Rivals
| Model | Battery | Range | DC Rate | Max Tow | Starting Price |
|---|---|---|---|---|---|
| GMC Sierra EV (Max Range) | ~205 kWh Ultium | 478 miles EPA | 350 kW | 10,200 lb | $91,695 |
| Chevy Silverado EV WT | 205 kWh Ultium | 493 miles EPA | 350 kW | 10,000 lb | from $54,895 |
| Rivian R1T (Max Pack) | 140 kWh NMC | 410 miles EPA | 220 kW | 11,000 lb | ~$80,000 |
| Tesla Cybertruck AWD | 123 kWh 4680 | 325 miles EPA | 250 kW | 11,000 lb | $74,990 |
Full specs for the Rivian and Tesla rivals above are in our Rivian R1T battery guide and Tesla Cybertruck battery guide.
Frequently Asked Questions
What size battery does the GMC Sierra EV have?
Three sizes, all measured as usable capacity: Standard Range is about 119 kWh (14 modules), Extended Range is 170 kWh (20 modules) and Max Range is 205 kWh (24 modules). GM does not publish gross capacity figures for these packs.
What kind of battery does the GMC Sierra EV use?
An Ultium battery with NCMA (nickel cobalt manganese aluminum) pouch cells, built by Ultium Cells — the GM and LG Energy Solution joint venture — in Ohio and Tennessee. Every trim uses the same chemistry, including the Elevation; only the number of modules changes.
How long does a GMC Sierra EV battery last?
GM warranties it for 8 years or 100,000 miles and replaces the pack if its capacity falls below 75% in that period. Fleet data across more than 22,700 EVs averages about 2.3% capacity loss per year, so a Sierra EV pack should still hold roughly 80% or more of its capacity at eight years under normal use.
How much does it cost to replace a GMC Sierra EV battery?
GM publishes no official price. Given the pack’s size (up to 205 kWh) and GM’s roughly $190-per-kWh Bolt recall benchmark, a full out-of-warranty replacement would plausibly run $20,000-$38,000. Most owners never face it — the warranty runs 8 years or 100,000 miles, and dealers can replace individual modules for far less.
Can you upgrade a Sierra EV to a bigger battery after purchase?
No. The pack’s module count — 14, 20 or 24 — is fixed when the truck is built, and GM offers no conversion from Standard Range to Extended or Max Range. Choose the pack size when you order the truck.
How can I tell which battery pack a GMC Sierra EV has?
Check the window sticker or build sheet for the range rating: 283 miles is the Standard Range pack, 390-410 miles is Extended Range, and 478 miles is Max Range. Trim helps too — Elevation offers Standard or Extended, AT4 offers Extended or Max, and Denali offers all three.
Conclusion
The GMC Sierra EV battery lineup is the most comprehensive in the electric truck segment — three pack sizes from 120 to 205 kWh, up to 478 miles GM-estimated range, 350 kW charging, and 10.2 kW Energy Transfer Pro. Buyers wanting GM’s most extreme off-road electric truck should also see our GMC Hummer EV battery guide. The 2026 model year’s expansion to three trims (Elevation, AT4, Denali) gives buyers genuine choice from $64,495. For buyers who need maximum range and maximum towing capability in a premium package, the Sierra EV’s Ultium battery technology is the benchmark of the 2026 electric truck class.
