Odyssey Extreme ODS-AGM70A (PC1700T) AGM Battery

Dual-purpose 12V AGM battery for high-demand starting and deep-cycle accessory loads. Ideal for performance vehicles, off-road trucks, and marine systems that need reliable starts plus steady power for winches, lighting, electronics, or audio.

Key specs at a glance

• Voltage: 12V
• Capacity: 68Ah (nominal)
• Cold Cranking Amps (CCA): 815
• Chemistry: AGM (Thin Plate Pure Lead)
• Cycle life: up to 400 cycles at 80% depth of discharge (usage-dependent)
• Operating temperature: as low as -40°F; up to 176°F with optional metal jacket
• Terminals: SAE top posts (T)
• Approx. weight: ~58 lb
• Approx. dimensions (L × W × H): 13.02 × 6.64 × 7.87 in

When to choose this battery

• Use if you need strong cranking for larger or high-compression engines and frequent accessory use (winch, lights, pumps, amplifiers).
• Use for mixed starting/deep-cycle duty in trucks, overland rigs, and boats where vibration resistance and spill-proof design matter.
• Avoid if minimizing weight is critical (consider lithium) or if your tray cannot accommodate the size/weight.

Fit and compatibility

• Verify tray space: 13.02 × 6.64 × 7.87 in and ~58 lb. Ensure a secure tie-down.
• Terminals: SAE top posts. Confirm cable reach and polarity orientation before purchase.
• Mounting: upright or on its side (not inverted). The sealed AGM design is spill-proof.
• Marine use: suitable for engine start and house loads. Keep connections corrosion-free and above potential bilge splash.

Charging and maintenance

• Charger setting: AGM profile. Target absorption/charging voltage 14.4–14.8V; float 13.5–13.8V.
• Charge current: a quality charger in the 10–30A range is typical for a 68Ah AGM. Follow the charger and manufacturer guidelines.
• Alternator: Works with most modern systems (typically 14.2–14.7V). Short-trip driving may undercharge; use a maintainer if needed.
• Storage: Disconnect parasitic loads. Recharge if open-circuit voltage falls to ~12.4V. Check every 2–3 months.
• Care: Keep terminals clean and tight. Avoid repeated deep discharges to maximize cycle life.

Runtime examples (estimates)

Usable capacity for long life is often ~50% of 68Ah ≈ 34Ah. Actual runtime depends on temperature, age, and load.

• LED work lights at 5A total: roughly 6–7 hours to ~50% depth of discharge.
• Fishfinder/GPS at 2A: roughly 15–17 hours to ~50% depth of discharge.
• 12V fridge averaging 3A: roughly 9–11 hours to ~50% depth of discharge.

High-draw tools (e.g., winches, large inverters) can exceed 100–200A. For heavy pulls, keep the engine running or consider a dual-battery setup.

Pros and cons

• Pros: Strong cranking, deep-cycle capable, sealed and spill-proof, excellent vibration resistance, wide operating temperature range.
• Cons: Heavier than comparable-capacity lithium, requires correct AGM charging profile, size/weight may exceed smaller trays.

Installation checklist

1. Confirm dimensions, terminal type, and polarity orientation against your vehicle/boat.
2. Pre-charge with an AGM charger if the battery has been sitting or measures under ~12.6V.
3. Clean and tighten all cable lugs; use anti-corrosion spray if in marine or salted environments.
4. Secure the battery firmly; avoid movement and vibration hotspots.
5. After install, verify charging voltage at the posts with the engine running (typically 14.2–14.7V).

Safety notes

• Do not short terminals. Use eye protection when working around batteries.
• Avoid mounting upside-down. Keep away from direct exhaust or enclosed heat sources.
• Recycle at an authorized facility at end of life.

FAQ

Is this a starting battery, a deep-cycle battery, or both?

It’s a dual-purpose AGM: strong starting capability with support for moderate deep cycling. For frequent deep discharge, consider a higher-capacity house battery or a dual-battery system.

Can I mount it on its side?

Yes. The sealed AGM design allows upright or side mounting. Do not mount inverted.

What charger should I use?

Use a quality smart charger with an AGM setting. Target 14.4–14.8V during absorption and 13.5–13.8V float. Avoid overvoltage.

Will my stock alternator charge it?

Most stock alternators that regulate around 14.2–14.7V will charge it adequately. Short-trip driving may require periodic use of a maintainer.

How long will it last?

Lifespan depends on depth of discharge, temperature, and charging quality. Keeping it fully charged, minimizing deep discharges, and avoiding high heat will extend service life.