Optima RedTop Starting Batteries

The Optima RedTop is an AGM starting battery engineered to deliver strong cranking power, low internal resistance, and excellent vibration resistance. It’s a dependable choice for vehicles that need confident starts in hot or cold weather without frequent deep discharges.

When to Choose the RedTop

• Gas or diesel engines that need high cold-cranking performance for reliable ignition.
• Daily drivers, trucks, SUVs, hot rods, and off-road rigs exposed to vibration.
• Cold-climate use where higher CCA and fast voltage recovery matter.
• Vehicles with mostly stock to mildly upgraded electrical systems.

When to Consider Alternatives

• Frequent engine-off accessory use (winches, inverters, refrigerators, big audio). Choose a deep-cycle or dual-purpose battery instead.
• Start-stop (idle-stop) vehicles that require an OEM-specified EFB/AGM with battery registration/coding. Follow manufacturer specs.
• Long, repeated deep discharges. A deep-cycle design is better suited.

What It Is

RedTop is a sealed, non-spillable AGM starting battery using spiral-wound lead plates to deliver high burst current and strong resistance to shock and vibration. It is maintenance-free and can be mounted in multiple orientations (avoid fully inverted installations unless specifically approved by the vehicle/battery manufacturer).

Specs at a Glance (varies by group size)

• Type: AGM (Absorbent Glass Mat) starting battery
• Cold Cranking Amps (CCA): typically 720–800
• Reserve Capacity: typically ~90–120 minutes
• Terminals: Top posts; some models offer dual terminals (top + GM side)
• Maintenance: Sealed, no watering; corrosion-resistant design

Fitment and Options

Available in common BCI group sizes. Confirm your vehicle’s required group size, terminal type, and hold-down before ordering.

• Group 34 / 34R / 34/78 (dual terminal)
• Group 35
• Group 25
• Group 78 (side terminal)
• 6V option for certain classic vehicles

Tip: In cold climates, choose the correct group size with the highest available CCA that fits your tray and cables.

Real-World Use

• Cold starts: High CCA helps crank confidently in subfreezing weather.
• Off-road/rough roads: Spiral-wound construction improves vibration resistance.
• Engine-off accessories: Limit to short periods. As a rule of thumb, keep engine-off draws to 1–2 hours max (e.g., 2 A LED lighting) to preserve starting reserve—less in cold weather.

Installation Checklist (10–30 minutes)

1. Verify group size, terminal orientation, and cable reach.
2. Save vehicle settings if needed; turn ignition off. Wear eye protection and gloves.
3. Disconnect negative (–) first, then positive (+). Remove old battery and clean the tray/hold-down.
4. Set the RedTop in the tray, secure the hold-down so the battery cannot move.
5. Connect positive (+) first, then negative (–). Tighten to vehicle spec—do not overtighten. Apply terminal protectant if desired.

Charging and Storage

• Use an AGM-compatible charger/maintainer.
• Typical AGM charging: bulk 14.4–14.7 V; float 13.2–13.8 V (follow charger and vehicle specs).
• Avoid deep discharges; recharge promptly if voltage drops below ~12.4 V (at rest).
• If deeply discharged, use a charger with recovery mode designed for AGM batteries.
• For seasonal storage, keep on an intelligent maintainer; store in a cool, dry place.

Safety Notes

• Always disconnect the negative cable first and reconnect it last.
• Do not short terminals; keep metal tools away from both posts.
• AGM batteries are sealed but can vent in rare overcharge conditions—ensure proper charging voltages.

FAQs

Can a RedTop run a winch or big audio system?

It can support short bursts while the engine is running, but frequent or prolonged accessory loads can shorten its life. For heavy cycling, use a deep-cycle or dual-purpose battery (or add an auxiliary deep-cycle).

Is it compatible with my alternator?

Most modern charging systems that reach ~14.2–14.7 V work well with AGM batteries. If your vehicle consistently charges low, the battery may not fully recharge—inspect the charging system.

How long will a RedTop last?

Service life varies with heat, vibration, and charging. Many users see 3–5+ years with proper charging and minimal deep discharges.

Can I replace an OEM EFB or AGM in a start-stop car?

Follow the vehicle’s spec. Some start-stop systems require specific EFB/AGM ratings and battery registration/coding. If in doubt, use the OEM-equivalent battery and perform registration.

Does mounting orientation matter?

The RedTop is non-spillable and can be mounted in various orientations. Use an approved hold-down and avoid fully inverted mounting unless explicitly allowed by the manufacturer.