Your C7 Corvette left the factory with an AGM (Absorbent Glass Mat) battery in the Group 47 / H5 case, and that is exactly what you should replace it with. The Stingray, Grand Sport, Z06, and ZR1 all run a hungry electrical system, the engine bay gets hot, and many of these cars sit for weeks between drives. A flooded lead-acid battery will sulfate, leak, and leave you stranded. A proper AGM with strong cold cranking amps and a deep reserve capacity keeps the dash electronics happy, survives parasitic drain during storage, and turns the LT1, LT4, or LT5 over instantly on a cold morning.
We focused on batteries that physically drop into the C7 tray without spacers, match or exceed the OE cranking power, and hold up to vibration and heat. Below are seven AGM options that genuinely fit and perform, ranked best first. Every one is a sealed, spill-proof, maintenance-free AGM so it is safe in the Corvette’s enclosed mounting location.
| Photo | Product | Score | Buy |
|---|---|---|---|
 |
Optima Batteries 8020-164 35 RedTop AGM Best Overall Group 35/47 SpiralCell AGM, 720 CCA, 90 min reserve |
9.5 | 🛒 Check Price |
 |
ACDelco Gold 47AGM Professional AGM Best OE Match Group 47 (H5) AGM, ~600 CCA, factory-spec fitment |
9.3 | 🛒 Check Price |
 |
Odyssey 34/78-PC1500 Performance AGM Longest Lifespan Dual-terminal AGM, 850 CCA, up to 400 cycle deep-cycle capability |
9.2 | 🛒 Check Price |
 |
XS Power D4800 AGM Best for Audio Builds Group 47 AGM, ~3000 max amps, 800+ cranking amps |
9.1 | 🛒 Check Price |
|
🚗
|
DieHard Platinum AGM Group 47 (H5) Best Reserve Capacity Group 47 (H5) AGM, ~730 CCA, ~90 min reserve |
8.9 | 🛒 Check Price |
 |
Optima Batteries 8040-218 D35 YellowTop AGM Best Dual-Purpose Group 35/47 dual-purpose AGM, 620 CCA, 98 min reserve |
8.7 | 🛒 Check Price |
 |
NORTHSTAR NSB-AGM35 Pure Lead AGM Premium Pure Lead Group 35/47 pure lead AGM, ~710 CCA, high cycle life |
8.5 | 🛒 Check Price |
1. Optima Batteries 8020-164 35 RedTop AGM: Best Overall
The Optima RedTop is the battery most C7 owners reach for first, and for good reason. Its SpiralCell construction packs serious cranking muscle into the Group 35/47 footprint that fits the Corvette tray, delivering 720 CCA that fires the LT1, LT4, or LT5 without hesitation even after the car has sat in a cold garage. The sealed AGM case is fully spill proof and handles the heat and vibration of an enclosed engine-bay mount better than almost anything else on this list.
The honest weakness is that the RedTop is built as a starting battery, not a deep-cycle unit. If you run a big aftermarket stereo, lots of accessories, or leave the car parked for very long stretches drawing the battery down repeatedly, a dedicated dual-purpose AGM will hold up better over time. For a Corvette that is driven regularly and just needs reliable, powerful starts, this is the gold standard.
- SpiralCell AGM design for strong, clean cranking power
- 720 cold cranking amps for instant LT1 and LT4 starts
- Up to 15 times more vibration resistant than standard batteries
Pros: Huge cranking reserve for cold starts; Famously vibration and shock resistant; Long service life when not deeply discharged
Cons: RedTop is starting-focused, not ideal for heavy deep cycling; May need the OE hold-down adjusted for the post layout
2. ACDelco Gold 47AGM Professional AGM: Best OE Match
If your priority is a no-surprises factory replacement, the ACDelco Gold 47AGM is the safest call. It is a genuine Group 47 / H5 AGM, which is the exact case and chemistry GM fitted to the C7 from the factory, so it slots into the tray and accepts the OE hold-down and terminals with no adapters or guesswork. ACDelco is GM’s own parts brand, so the spec sheet lines up perfectly with what the Corvette’s charging system and battery management expect.
The tradeoff is that it is built to OE numbers rather than to beat them. Its cold cranking amps land near the stock figure, which is plenty for normal use but gives you less margin than the Optima or XS Power picks if you live somewhere bitterly cold or have added electrical load. For a clean, correct, brand-matched replacement that the car will simply accept, it is hard to beat.
- True Group 47 / H5 case matches the C7 tray and hold-down exactly
- AGM construction is the GM-specified chemistry for the Corvette
- High-density negative paste for longer life and better performance
Pros: Genuine OE-style drop-in with zero fitment fuss; Matches GM's original AGM specification; Trusted brand for late-model GM vehicles
Cons: CCA is closer to stock than to the high-output picks; Less cranking headroom for extreme cold than the Optima
3. Odyssey 34/78-PC1500 Performance AGM: Longest Lifespan
Odyssey’s PC1500 uses pure-lead TPPL plate technology, and it shows in both raw power and stamina. With 850 CCA on tap it cranks the LT4 and LT5 with authority, and unlike a pure starting battery it tolerates being drawn down and recharged hundreds of times, which is exactly what you want in a Corvette that gets stored seasonally or driven hard with accessories. Owners regularly report this battery outlasting two ordinary replacements, making it strong long-term value.
The catch is fitment. This is a dual-terminal 34/78 case rather than a plain Group 47, so before you order you should confirm the terminal positions clear the C7’s hold-down and cable routing. It is also a dense, heavy unit. Get it mounted correctly and it is arguably the most durable battery here, but it asks for a little more planning than a true drop-in.
- Pure lead TPPL plates for big cranking and deep-cycle endurance
- 850 cold cranking amps with strong recharge efficiency
- Rated for 3 to 10 year service life with proper care
Pros: Exceptional cycle life and longevity; Massive cranking power for any C7 engine; Handles storage drain and recharge very well
Cons: Verify the dual-terminal layout clears your tray and hold-down; Heavier and a tighter fit than a plain Group 47
4. XS Power D4800 AGM: Best for Audio Builds
If your C7 has a serious audio system or other high-draw upgrades, the XS Power D4800 is purpose-built for that fight. It is a Group 47 AGM with extremely low internal resistance, capable of dumping huge instantaneous current to amplifiers without the voltage sag that dims lights and triggers warnings on a normal battery. It still cranks the engine strongly and mounts in any orientation thanks to the fully sealed AGM construction.
For a bone-stock Corvette this battery is more than you need, and that capability is reflected in its enthusiast-grade build. But if you have added power-hungry electronics and want rock-steady voltage under load, very few drop-in batteries match the D4800’s current delivery in the C7 footprint. It is the specialist’s choice rather than the default pick.
- Ultra-low internal resistance for high-current electrical loads
- Sealed AGM that mounts in any position safely
- Built to feed amplifiers and high-draw accessories without sagging
Pros: Outstanding for big stereo and accessory loads; Very high current delivery and fast recharge; Vibration resistant sealed AGM design
Cons: Overkill for a stock electrical setup; Premium build aimed at enthusiast use
5. DieHard Platinum AGM Group 47 (H5): Best Reserve Capacity
The DieHard Platinum AGM in the Group 47 / H5 size is a well-rounded choice for owners who park the Corvette for weeks at a time. Its reserve capacity is one of the strongest in the true Group 47 class, so it tolerates the parasitic drain of the C7’s modules during storage and still has the punch to start when you come back to it. The stamped-grid AGM plates resist the corrosion and vibration that kill cheaper batteries in a hot engine bay.
It is a genuine drop-in for the C7 with cranking power that comfortably matches the OE spec, so day to day it just works. The main caveats are practical rather than technical: DieHard’s retail footprint and support have changed in recent years, so stock can be inconsistent depending on where you shop. When you can get one, it is a dependable, storage-friendly AGM.
- True Group 47 fitment with strong reserve for storage
- Stamped-grid AGM design resists corrosion and vibration
- Holds charge well during long parked periods
Pros: Great balance of cranking power and reserve; Direct Group 47 fit for the C7; Strong stand-by performance for stored cars
Cons: Availability can vary by retailer; Brand support shifted in recent years
6. Optima Batteries 8040-218 D35 YellowTop AGM: Best Dual-Purpose
The Optima YellowTop is the dual-purpose sibling of the RedTop, and it is the smarter buy for a C7 that gets stored a lot or runs added electrical load. Its SpiralCell AGM plates are designed to be cycled, so repeatedly drawing the battery down and topping it back up does not wreck it the way it would a starting-only unit. The 98 minute reserve is generous, giving the Corvette’s modules plenty to live on during long parked stretches.
The compromise is cranking amps. At 620 CCA it has less raw starting punch than the RedTop’s 720, so in extreme cold it has slightly less headroom, though it is still ample for the LT-series engines. If your driving pattern leans toward storage, accessories, and deep cycling rather than just cold starts, the YellowTop is the more appropriate Optima for the job.
- True deep-cycle plus starting capability in one battery
- SpiralCell AGM survives repeated draw-down and recharge
- 98 minute reserve for heavy accessory and storage use
Pros: Handles deep discharge far better than starting-only AGMs; Long reserve capacity for parked cars; Same proven SpiralCell durability
Cons: Lower CCA than the RedTop for pure cranking; Costlier capability than a stock car needs
7. NORTHSTAR NSB-AGM35 Pure Lead AGM: Premium Pure Lead
NORTHSTAR builds pure-lead AGM batteries that compete directly with Odyssey on longevity and recharge speed, and the NSB-AGM35 brings that engineering into a Group 35/47 footprint that suits the C7. Pure lead plates recover charge quickly and tolerate deep cycling, so this battery shrugs off the storage drain and recharge pattern that wears out ordinary units. Cranking power around 710 CCA keeps starts crisp in cold weather.
It is a less mainstream name than Optima or ACDelco, so the practical advice is to confirm the exact case dimensions and terminal layout against your C7 tray before buying, since availability and listings vary. Do that and you get one of the longest-lasting, hardest-working AGM batteries you can fit, which is why it earns a place for owners chasing maximum service life over convenience.
- Pure lead AGM plates for fast recharge and long life
- Strong cranking with excellent deep-cycle endurance
- Sealed, spill-proof and vibration resistant
Pros: Top-tier longevity and recharge speed; Strong cranking and deep-cycle in one; Strong sealed AGM build for hot engine bays
Cons: Less common, so fitment should be double-checked; A premium, enthusiast-oriented option
Frequently Asked Questions
What size battery does a C7 Corvette use?
The 2014 to 2019 C7 Corvette uses a Group 47 battery, also called an H5, in an AGM (Absorbent Glass Mat) configuration straight from the factory. Some high-performance AGM options come in the closely related Group 35 case, which shares the same footprint and fits the C7 tray, but you should always confirm the terminal positions and hold-down clearance before buying. Sticking with Group 47 or a verified Group 35/47 unit keeps installation a true drop-in.
Does the C7 Corvette require an AGM battery?
Yes. GM specified an AGM battery for the C7 because it is sealed, spill proof, and mounted in an enclosed location, and because the car’s electrical and storage demands favor AGM chemistry. Installing a standard flooded lead-acid battery is not recommended, as it can vent, leak, and sulfate during the long idle periods many Corvettes experience. Every pick on this list is a sealed AGM to match what the car was designed to use.
How much CCA does a C7 Corvette battery need?
The factory C7 battery is rated around 600 to 720 cold cranking amps, so you want a replacement that meets or exceeds that range. Choosing a battery with higher CCA, like the 720 to 850 figures on several picks here, gives you extra margin for cold mornings and added electrical accessories without any downside to a healthy charging system. More CCA simply means more starting headroom.
Do I need to reprogram or register the battery after replacing it?
The C7 does not require a dealer battery registration the way some European cars do, but it is wise to use a memory saver during the swap so radio presets, clock, and module settings are retained. After installation, let the car idle or take a short drive so the charging system stabilizes. If you see any temporary warning lights, they typically clear after a normal drive cycle once the new battery is fully seated and connected.
How long should a C7 Corvette battery last?
A quality AGM battery in a C7 typically lasts four to seven years, though that depends heavily on how the car is stored. Corvettes that sit for weeks without a maintainer drain their battery and shorten its life, while cars kept on a smart trickle charger often reach the upper end of that range. Pure-lead options like the Odyssey and NORTHSTAR can stretch even further, which is why a battery tender is one of the best investments for any stored Corvette.
Our Verdict
For most C7 Corvette owners the Optima RedTop 8020-164 is our top pick, combining 720 cold cranking amps, legendary vibration resistance, and a true drop-in fit for reliable starts in any weather. If you want a guaranteed factory-correct replacement instead, the ACDelco Gold 47AGM is our runner up, matching GM’s exact Group 47 AGM specification with zero fitment fuss. Owners who store the car seasonally or run extra accessories should lean toward the Odyssey PC1500 or Optima YellowTop for their deep-cycle endurance, and whichever you choose, pair it with a smart battery maintainer to get the longest possible life.
More Batteries Guides
Video Guide
Video: Related tutorial from YouTube