Odyssey Extreme PC925 — Specs, Use Cases, and Setup Guide

The Odyssey Extreme PC925 is a compact 12V TPPL AGM battery built for strong cranking in tight spaces. It pairs high pulse current with robust vibration resistance, making it a fit for motorcycles, UTVs, kit cars, lightweight track cars, and compact street builds.

Key Specifications

• Voltage: 12V
• Capacity: 28Ah (20-hour rate)
• Cold Cranking Amps (CCA): 330A @ 0°F
• Pulse Hot Cranking Amps (PHCA): up to 900A (5 seconds @ ~77°F)
• Weight: ~26 lb
• Dimensions (L × W × H): 6.64 × 7.05 × 5.04 in
• Cycle life: up to ~400 cycles at 80% depth of discharge (when properly charged)
• Operating temperature (discharge): roughly -40°F to 140°F
• Mounting: sealed AGM; mount in any orientation except upside down
• Terminals: M6 threaded (SAE post adapters available on some variants)

When to Choose the PC925

• Compact, high-compression engines: Delivers strong crank for big-bore twins and tuned 4-cylinders.
• Limited space or weight targets: Small footprint with reliable starting power around 26 lb.
• High vibration environments: AGM construction handles off-road and track use.

When to Consider Alternatives

• Need more reserve capacity or long accessory runtime: Look at larger Odyssey models (e.g., PC1200) or a dual-battery setup.
• Chasing minimum weight: A quality motorsports-grade LiFePO4 can be lighter; ensure BMS and charging compatibility.
• Very cold starts below -20°F: A higher-CCA/greater capacity AGM may crank more confidently.

Charging and Maintenance

Proper charging is the biggest factor in lifespan and performance.

• Charge profile (AGM/TPPL): Bulk/absorption up to ~14.7V; float 13.5–13.8V.
• Charger current: 6–12A is a good range for recovery and maintenance; avoid trickle chargers that never exceed ~14.4V.
• Vehicle charging: Alternator output of ~14.2–14.8V at cruising RPM is ideal; low-voltage systems may undercharge.
• Storage: Keep above 12.6V. Use an AGM-compatible maintainer when the vehicle sits >2–3 weeks or has parasitic draw.
• General care: Keep terminals tight and clean; secure the battery to prevent movement.

Runtime Examples (Approximate)

For accessory use, avoid deep discharges; staying near 50% depth of discharge preserves life.

• At 5A continuous draw: about 2.5–3 hours to ~50% depth of discharge.
• At 2A continuous draw: about 6–7 hours to ~50% depth of discharge.

Note: Actual runtime varies with temperature, battery age, and load profile.

Installation Checklist

1. Confirm tray space (6.64 × 7.05 × 5.04 in) and cable reach; verify terminal type (M6) or adapters.
2. Mount securely; any orientation except upside down. Use a bracket or strap to prevent movement.
3. Connect positive first, then negative. Do not overtighten threaded terminals; follow manufacturer torque guidance.
4. Verify charging voltage at the battery with the engine at fast idle: target ~14.2–14.8V.
5. After installation, fully charge to ~100% before first use for best performance.

Model Variants and Fit Notes

• PC925MJT (metal jacket): Adds a heat shield for higher under-hood temperatures.
• Terminal kits: Some versions include SAE posts; others are M6-only—check before ordering.

FAQ

Is the PC925 a deep-cycle battery?

It’s a starting/deep-cycle capable AGM. It can tolerate deeper discharges than standard starting batteries, but frequent deep cycling will shorten life. Use it primarily for starting; size up if you need long accessory runtime.

What charger should I use?

Use an AGM-compatible smart charger that reaches ~14.7V in absorption and maintains 13.5–13.8V in float. A 6–12A charger balances speed and cell health.

How long does it take to recharge?

Estimate hours ≈ amp-hours to replace ÷ charger amps, plus 1–2 hours for absorption. Example: recovering ~14Ah at 6A takes ~2.5–3 hours, then add up to 2 hours to top off.

Does it need venting?

AGM batteries are sealed and low-emission under normal use, but any battery should be installed in a secure, reasonably ventilated location away from sparks and open flame.

Will it fit my vehicle?

Measure your tray and cables, confirm terminal type, and verify your charging system voltage. If you run many accessories or see very cold starts, consider a higher-capacity model.

Safety Notes

• Wear eye protection when working around batteries.
• Disconnect the negative cable first when removing; reconnect it last when installing.
• Recycle batteries through approved programs; do not dispose of in household trash.