Hurrey’s Performance – Hamilton NJ’s Premier Auto Repair, Offroad, Diesel & Performance Shop

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Hurrey's Battery Guide & Sizing Tool – BETA
🔋 HURREY'S BATTERY TOOL

Battery Guide & Sizing Tool – BETA

Quick-and-dirty sizing for automotive starting and accessory batteries. Helps pick CCA, group size, battery type, and dual-battery layouts for 12V and 24V systems. A helper for your brain – not a replacement for specs.

CCA vs CA explained BCI group sizes & terminals Single vs dual battery 12V vs 24V reference
Starting Requirements

CCA & Starting Battery Sizing

Use engine type, size and climate to get a starting CCA range.

Starting Focused
This nudges recommendations – always default to manufacturer ratings.
Pick “Not applicable” if this battery doesn’t crank an engine.
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Pick engine type, class and climate to get an approximate CCA range. Always follow OE / battery manufacturer specs first.

CCA = Cold Cranking Amps at 0°F. CA (or MCA) is rated at 32°F and will always be higher. Compare batteries using CCA when possible.

Physical Fitment

BCI Group Size & Terminals

Common group sizes, dimensions and post layouts.

Fit Check Helper
Use this if you’re forcing a particular post style into a tray.
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Select a BCI group size to see approximate dimensions, typical CCA range and common terminal layout.

Always measure the tray and hood clearance on the actual vehicle – group charts get you close, not perfect.

Battery Type

Chemistry & Construction

Pick what type of battery you’re planning to use.

Behavior & Charging
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Select a battery type to see pros, cons, charging and where it makes sense on a vehicle.
Single vs Dual

Battery Bank Layout

Figure out voltage and capacity with one or two batteries.

Series vs Parallel
Use Ah from the spec sheet if listed. Many start batteries don’t advertise it clearly.
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We’ll estimate resulting system voltage, effective CCA and amp-hour capacity. Do not mix age, type or size in the same bank.
Quick Reference

Real-World Battery Notes

Use these as sanity checks next to the calculator.

Practical Stuff
Typical CCA ballparks
  • Small gas car: ~400–550 CCA.
  • Mid-size gas / small SUV: ~500–650 CCA.
  • Gas truck / large SUV: ~650–800 CCA.
  • Light-duty diesel pickup: ~750–1,000+ CCA.
  • Heavy diesel / plow rig: ~900–1,200+ CCA.
  • Winch / overland builds: higher CCA + good reserve capacity is your friend.
Extra considerations
  • Heat kills batteries – under-hood turbo temps shorten life a ton.
  • Vibration is brutal off-road – AGM usually handles it better.
  • Alternator output and charge profile must match battery type.
  • Don’t mix old and new batteries in parallel – the weak one drags the strong one down.
  • For long camping stays, amp-hours and daily load matter more than raw CCA.
Read This

Battery Disclaimer – Use With Specs

This tool gives generalized guidance for automotive-style batteries. CCA ranges, group sizes and dual-battery notes are simplified and may not match any one manufacturer’s catalog or OE requirement. Modern vehicles with start/stop, smart charging or battery monitoring systems often require very specific battery types, sizes and registration procedures.

Always confirm battery size, type, CCA and installation details with the vehicle manufacturer, battery manufacturer and any onboard electronics requirements. Incorrect battery selection or wiring can cause no-starts, module damage or charging system failures. If you’re not sure, oversize carefully, wire it cleanly and verify with real data.

Summary

Session Summary / Battery Notes

Drop this into your RO, estimate or customer text.

Built from your selections

Start filling in engine, climate and battery details – this will auto-populate with your current choices.

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