Batteries
About Batteries
A battery supplies the burst of current that turns the starter and keeps the electrical system steady when the engine is slow. Riders replace one when the bike cranks slowly, when it fails to hold a charge after sitting, or after a winter of storage that ended badly.
Choose by type, size and voltage. The listings here include conventional lead-acid batteries, sold with acid or with an electrolyte pack to be filled, and AGM maintenance-free batteries, which are sealed and need no topping up. Size and terminal layout must match your machine, and codes such as YTX7L-BS identify case size and type. Most are 12 volts, and some older bikes use 6-volt batteries, so check yours. Many listings cover several makes, including Harley-Davidson, Honda, Yamaha, Kawasaki, Suzuki and Arctic Cat, so read the fit list. Battery covers and electrolyte are listed here too.
Brands in this category include Antigravity, HardDrive, Drag Specialties, Parts Unlimited and Grote. Pick your machine in the Ride Finder at the top of the page. If a new battery keeps going flat, look at Alternators & Generators, Fuses & Fuse Boxes, Relays and Starter Motor Parts. The whole group is Electrical & Ignition Components.
FAQs on motorcycle batteries
What is the difference between AGM, conventional and maintenance-free batteries?
A conventional lead-acid battery needs acid filled and the level checked. An AGM battery is sealed, holds the electrolyte in glass mats and needs no topping up. Maintenance-free means no water addition. Use the type your bike's maker lists.
How do I find the right battery for my motorcycle?
Match the voltage, the case size, and the terminal positions and polarity of your original. The battery code, such as YTX7L-BS, helps. Check the fit list in the title, and do not assume two batteries are interchangeable.
Does a new battery come ready to use?
It depends. A conventional battery sold with an acid pack needs to be filled and charged first, while a sealed one is ready after its initial charge per instructions. Read the listing and follow the maker's steps before you ride.
How should I store a motorcycle battery over winter?
Keep it charged and in a cool, dry place, and use a maintainer made for your battery type. A battery left discharged can lose capacity permanently. Disconnect it from the bike if the bike will sit for months.
Is it safe to charge a motorcycle battery on the bike?
It can be, with a charger made for the battery type and the correct voltage. Charge in a ventilated space away from sparks and flames, because batteries can give off gas, and follow the charger's instructions.
