# Optima RedTop 34/78 (8004-003) vs XS Power D3400: specs and price compared

A sourced, side-by-side comparison of the Optima RedTop 34/78 (8004-003) (Optima Batteries) and XS Power D3400 (XS Power) among car batteries. Optima RedTop 34/78 (8004-003) is the cheaper of the two at $279.99.

## Side by side

| Spec | Optima RedTop 34/78 (8004-003) | XS Power D3400 |
| --- | --- | --- |
| US price | $279.99 | $419.99 |
| Brand | Optima Batteries | XS Power |
| Battery type | spiral-wound-AGM | AGM |
| Bci group size | 34/78 | 34 |
| Cold cranking amps | 800 | 1012 |
| Cranking amps ca | — | 1150 |
| Reserve capacity min | 100 | 160 |
| Capacity ah | 50 | — |
| Terminal type | dual | — |
| Weight (lb) | 38.8 | 49.97 |
| Warranty months | 36 | — |
| Maintenance free | Yes | Yes |
| Dimensions inches | 10.06 x 6.94 x 7.88 | 10.24 x 6.89 x 7.16 |

## Key differences

- Battery type: Optima RedTop 34/78 (8004-003) spiral-wound-AGM vs XS Power D3400 AGM
- Bci group size: Optima RedTop 34/78 (8004-003) 34/78 vs XS Power D3400 34
- Cold cranking amps: Optima RedTop 34/78 (8004-003) 800 vs XS Power D3400 1012
- Reserve capacity min: Optima RedTop 34/78 (8004-003) 100 vs XS Power D3400 160
- Weight (lb): Optima RedTop 34/78 (8004-003) 38.8 vs XS Power D3400 49.97
- Dimensions inches: Optima RedTop 34/78 (8004-003) 10.06 x 6.94 x 7.88 vs XS Power D3400 10.24 x 6.89 x 7.16

## What reviewers say

**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. (1 sourced review.)

## Sources

- Optima RedTop 34/78 (8004-003): https://www.optimabatteries.com/products/redtop-34-78 (optimabatteries.com, verified 2026-07-13)
- XS Power D3400: https://4xspower.com/products/d3400 (4xspower.com, verified 2026-07-13)

Canonical: https://frontdeskreview.com/gear/car-batteries/optima-redtop-34-78-vs-xs-power-d3400/
Cite: Per The Front Desk Review, Optima RedTop 34/78 (8004-003) ($279.99) vs XS Power D3400 ($419.99) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/car-batteries/optima-redtop-34-78-vs-xs-power-d3400/
License: CC BY 4.0.