Optima Batteries · Updated July 2026
Optima RedTop 34/78 (8004-003): price & specs
The Optima RedTop 34/78 (8004-003) costs $279.99, #4 cheapest of 6 car batteries (median $277). It earns a Bronze Deskmark — 41/100 pay-blind standing, #7 of 9 in class.
Verified Jul 13, 2026 · figures linked to their source in the table below
- Best for Best-value AGM pick — reliable and worth the price premium; Spiral-cell design resists vibration and outlasts standard lead-acid.
- Skip if Lower CCA rating than competing AGM batteries is a dealbreaker.
Optima RedTop 34/78 (8004-003). Every price and spec below is linked to its source and dated — no guesses.
Source: optimabatteries.com verified ✓ corroborated verify in ledger
Is the Optima RedTop 34/78 (8004-003) a good buy?
At $280, the Optima RedTop 34/78 (8004-003) is #4 cheapest of the 6 car batteries we track, where the median is $277. On the spec sheet, its reserve capacity min of 100 is the lowest of the 9, its capacity ah of 50 is the lowest of the 7, and its weight of 38.8 lb is the lowest of the 7.
Evidence of Record
Our dataNo independent lab has measured this product yet. 1 outlet has it on record by mention only, with no hands-on measurements published to weigh its claims against — a gap in the evidence, not a verdict on the product.
Review consensus · sourced & dated
What reviewers say about the Optima RedTop 34/78 (8004-003)
Only one whitelisted tester covers this battery. Pro Tool Reviews names the Optima RedTop its best-value AGM pick, praising reliability, longevity and vibration resistance while flagging a lower CCA rating than pricier rivals. This is a qualitative buying-guide verdict for the RedTop line (which includes the 34/78), not a bench test of the 8004-003, and no whitelisted outlet published measured lab numbers for this exact model.
Tested by Pro Tool Reviews
Consistently praised
- Best-value AGM pick — reliable and worth the price premium
- Spiral-cell design resists vibration and outlasts standard lead-acid
- 3-year replacement warranty, widely available in-store and online
Commonly flagged
- Lower CCA rating than competing AGM batteries
- Heavy-electronics or auto stop-start vehicles need the pricier YellowTop
- More expensive than standard lead-acid batteries
Where reviewers disagree Only one whitelisted source, so no cross-source comparison is possible. Pro Tool Reviews' verdict is a field-experience buying-guide recommendation of the RedTop line (which includes the 34/78) rather than instrumented lab testing of the 8004-003; its cited CCA (720-800) and reserve (90-100 min) figures are manufacturer spec ranges, not values the tester measured.
The sources (1)
the RedTop earns our pick as the best AGM car battery for the money. While not the cheapest AGM you can buy, it's more reliable.
they have been field-proven and trusted long enough to have earned a rock-solid reputation for performance, quality, and reliability.
Not as high a CCA rating as other options
Specifications
| Price (US) | $279.99 US street price $279.99, sourced verbatim from the BigTimeBattery listing ("Optima Red Top Battery, Group Size 34/78, 800 CCA ... $ 279.99") for the Optima Red Top 34/78 (8004-003). OPTIMA publishes no formal MSRP, and the Remy Battery listing for the same battery shows "Contact for Pricing". No refundable core charge is noted on the fetched page. |
|---|---|
| Brand | Optima Batteries |
| Released | — |
| Battery type | spiral-wound-AGM |
| Bci group size | 34/78 |
| Cold cranking amps | 800 |
| Cranking amps ca | — |
| Reserve capacity min | 100 |
| Capacity ah | 50 |
| Terminal type | dual |
| Weight (lb) | 38.8 |
| Warranty months | 36 |
| Maintenance free | Yes |
| Dimensions inches | 10.06 x 6.94 x 7.88 |
Source: optimabatteries.com (verified 2026-07-13) · corroborated by bigtimebattery.com. The manufacturer's REDTOP 34/78 product page and OPTIMA's own "34/78 Battery 800 CCA" article (optimabatteries.com) confirm this is the Group 34/78 REDTOP starting battery, conservatively rated at 800 cold cranking amps and 50 Ah, with both top (Group 34) and side (Group 78) terminals. BigTimeBattery's listing for the identical battery names MPN 8004-003 (Group Size 34/78) and supplies the full verbatim spec sheet used here — Cold Cranking Amps 800, Reserve Capacity 100 Minutes, C20 Capacity 50 Ah, Dual SAE/GM posts, dimensions L 10.06" x W 6.94" x H 7.88", weight 38.8 lbs, 36 Months Free Replacement warranty — at a street price of $ 279.99. crankingAmpsCa (1000 CA, seen only on the non-cited Remy Battery listing) is left null because it does not appear on either cited page.
Is the Optima RedTop 34/78 (8004-003) worth it vs cheaper car batteries?
Optima RedTop 34/78 (8004-003) against its closest cheaper and pricier car batteries on the specs that matter — every value sourced. See all 6 ranked →
| Product | Price | Battery type | Bci group size | Cold cranking amps | Reserve capacity min | Capacity ah |
|---|---|---|---|---|---|---|
| Optima RedTop 34/78 (8004-003) this | $279.99 | spiral-wound-AGM | 34/78 | 800 | 100 | 50 |
| Interstate MTX-94R/H7 AGM | $274.95 | AGM | 94R/H7 | 850 | 140 | 80 |
| XS Power D3400 | $419.99 | AGM | 34 | 1012 | 160 | — |
Frequently asked questions
What do reviewers say about the Optima RedTop 34/78 (8004-003)?
Only one whitelisted tester covers this battery. Pro Tool Reviews names the Optima RedTop its best-value AGM pick, praising reliability, longevity and vibration resistance while flagging a lower CCA rating than pricier rivals. This is a qualitative buying-guide verdict for the RedTop line (which includes the 34/78), not a bench test of the 8004-003, and no whitelisted outlet published measured lab numbers for this exact model. Praised: Best-value AGM pick — reliable and worth the price premium; Spiral-cell design resists vibration and outlasts standard lead-acid; 3-year replacement warranty, widely available in-store and online. Flagged: Lower CCA rating than competing AGM batteries; Heavy-electronics or auto stop-start vehicles need the pricier YellowTop; More expensive than standard lead-acid batteries. (From 1 tester review.)
How much does the Optima RedTop 34/78 (8004-003) cost?
The Optima RedTop 34/78 (8004-003) has a US price of $279.99 (US street price $279.99, sourced verbatim from the BigTimeBattery listing ("Optima Red Top Battery, Group Size 34/78, 800 CCA ... $ 279.99") for the Optima Red Top 34/78 (8004-003). OPTIMA publishes no formal MSRP, and the Remy Battery listing for the same battery shows "Contact for Pricing". No refundable core charge is noted on the fetched page.), as of 2026-07-13.
How does the Optima RedTop 34/78 (8004-003) compare on price?
At $280, the Optima RedTop 34/78 (8004-003) is #4 cheapest of the 6 car batteries we track, where the median is $277.
What are the Optima RedTop 34/78 (8004-003)'s key specs?
Optima RedTop 34/78 (8004-003) (Optima Batteries): batteryType spiral-wound-AGM, bciGroupSize 34/78, coldCrankingAmps 800, reserveCapacityMin 100, capacityAh 50. Full sourced spec sheet verified 2026-07-13.
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Head-to-head
- Optima RedTop 34/78 (8004-003) vs Odyssey 34-PC1500T Extreme Series
- Optima RedTop 34/78 (8004-003) vs DieHard Platinum AGM H6
- Optima RedTop 34/78 (8004-003) vs Bosch S6 High Performance AGM S6585B
- Optima RedTop 34/78 (8004-003) vs ACDelco 48AGM Professional AGM
- Optima RedTop 34/78 (8004-003) vs Interstate MTX-94R/H7 AGM
- Optima RedTop 34/78 (8004-003) vs XS Power D3400
- Optima RedTop 34/78 (8004-003) vs EverStart Maxx 35N
Cheaper car batteries
- Interstate MTX-94R/H7 AGM $274.95
- ACDelco 48AGM Professional AGM $183.99
- EverStart Maxx 35N $90
Step up
- XS Power D3400 $419.99
- Odyssey 34-PC1500T Extreme Series $429.99