Motorcycle & ATV Battery Cross Reference Chart

YTX stands for a factory-activated, sealed AGM battery in Yuasa's naming system. The Y is Yuasa, T indicates sealed and maintenance-free construction, and X means factory-activated. The electrolyte was added and the battery was charged at the factory before it shipped. When you buy a YTX battery, it arrives ready to install. No acid filling, no pre-charge needed. Other brands use the same YTX designation for direct-fit replacements: Powersport uses CTX, Adventure Power uses APTX.

No. The YTX12-BS measures 150x87x131mm and has a 10Ah capacity. The YTX14-BS measures 150x87x146mm and has a 12Ah capacity. The YTX14-BS is 15mm taller and won't fit in a battery compartment sized for a YTX12-BS. Even if you could force it in, the YTX12-BS is too small to reliably start a bike designed for a YTX14-BS, especially in cold weather. Always match the OEM battery size exactly.

YTX batteries are sealed AGM — they come factory-activated and need no maintenance. YB batteries are conventional flooded type. Many YB batteries ship dry and require you to fill them with electrolyte (acid) before the first use, then charge them before installing. During their lifespan, YB batteries need periodic water level checks and top-offs with distilled water. YTX batteries require none of that. For most modern bikes, YTX is the better choice.

Start with your owner's manual or the battery currently in the bike. The battery model number is printed on a label on the case. Use that number to find your row in the chart above, then pick the brand you want. If the battery is too old to read, most Yuasa and OEM fitment guides are organized by year/make/model — search for "[your bike make] battery fitment guide" and Yuasa's site will return the correct part number. Physical dimensions and terminal orientation are the critical specs. Ah capacity should match or be very close to OEM.

Only if the physical dimensions fit the original compartment. A battery with slightly higher Ah in the same case size is fine and may improve cold-weather starting. You cannot fit a physically larger battery into a compartment designed for a smaller one. A higher Ah battery charges normally on a stock charging system; the alternator doesn't care about the extra capacity. Going significantly lower in Ah than OEM spec is what causes problems, particularly on electric-start bikes.

A good AGM motorcycle battery typically lasts 3 to 5 years with proper care. Batteries on bikes that sit for months without a trickle charger often fail after 2 years or less. The main killers are deep discharge (letting it go completely dead), sulfation from long storage, and heat. If you store your bike over winter, connect a Battery Tender or similar float charger. Starting every few weeks and letting it idle isn't enough — idling at low RPM often doesn't fully recharge the battery.

Most factory-activated YTX AGM batteries arrive with enough charge to start your bike immediately. If the battery sat in a warehouse for several months, it may have self-discharged. A quick check with a voltmeter helps — a fully charged 12V AGM should read 12.7V or higher at rest. If it reads below 12.4V, give it a full charge with a smart charger before installing. Never use a standard car battery charger on a motorcycle AGM battery; use one rated for AGM or with an AGM mode.