Big Crank Batteries

What Makes Big Crank Batteries Different

Not every replacement battery is built the same, and if you have ever had a cheap battery die on you after one season, you already know why that matters. Big Crank batteries are manufactured in the USA by East Penn Manufacturing, the same company that produces Deka batteries and the OEM batteries used by Harley-Davidson. That means every Big Crank battery goes through the same quality control and AGM (Absorbed Glass Mat) construction found in factory equipment, just at a lower price.

AGM batteries are sealed and spill-proof, so there is no acid to top off and no risk of leaks if the bike tips over. They also handle vibration far better than older flooded batteries, which is exactly what you need for off-road ATVs, choppy watercraft, or long highway miles on a cruiser.

• Motorcycles, including cruisers, sport bikes, and touring models
• ATVs and UTVs
• Personal watercraft and jet skis
• Snowmobiles and scooters

How to Choose the Right Big Crank Battery

Big Crank batteries are sold by group size, and the easiest way to find your match is to look up the battery currently in your bike. Most powersport batteries are labeled with a Yuasa-style code (like YTX14L or YB16), and Big Crank offers direct equivalents across the lineup:

• Compact sizes (ETX9, ETX12): Common on scooters and smaller sport bikes needing 120 to 180 CCA
• Mid-range sizes (ETX14, ETX15, ETX16): The most popular fit for cruisers, standard motorcycles, and many ATVs, ranging from 220 to 325 CCA
• Heavy-duty sizes (ETX18L, ETX20L, ETX30L): Built for larger touring bikes and applications that need serious cranking power, up to 400 CCA

If you are not sure which size you need, check your owner's manual or the label on your old battery for the group number, and match the letter suffix (L or no L) to get the terminal orientation right. Our customer service team can also help you cross-reference your old battery if you get stuck.

Frequently Asked Questions

Who makes Big Crank batteries?

A: Big Crank batteries are manufactured by East Penn Manufacturing, one of the largest battery makers in the country. East Penn also produces Deka batteries and builds the OEM batteries used in Harley-Davidson® motorcycles, so you are getting the same manufacturing quality and AGM technology found in factory equipment, without the factory price tag.

How do I know which Big Crank battery fits my bike?

A: Check the label on your current battery for its group size or Yuasa-style code (such as YTX14L or YB16). Big Crank batteries are built as direct replacements for these common sizes, so matching that code to our ETX lineup will get you the right fit. If you cannot find the label, your owner's manual will list the correct battery group for your make and model.

How do I install a Big Crank battery with side-mount cables?

A: Every Big Crank battery ships with the spacers and bolts needed for side-mount installation. The round spacers are required only for side-mount cable connections. If your bike uses top-mount terminals, skip the spacers and use the bolts alone. Torque all terminal bolts to 6 to 8 ft. lbs. for a secure, flush connection that delivers full cranking power.

Are Big Crank batteries ready to use right out of the box?

A: Yes. Big Crank AGM batteries are factory-activated and fully charged before they ship, so there is no acid to add and no initial charging cycle required. Just install it, connect the terminals, and you are ready to ride.

How should I store my Big Crank battery during the off-season?

A: Keep it somewhere that will not consistently drop below freezing, since extreme cold can crack an AGM case. Connecting it to an automatic charger, like a Battery Tender or NOCO maintainer, is the best way to prevent sulfation and keep it fully charged while your bike sits idle. These chargers are fully automatic, so it is safe to leave them connected all winter.