what size battery for honda 420 rancher

Stick with the OEM spec YTX20L-BS. That's what came in mine and it's plenty for the 420. If you're having cold start issues, check your valve clearances too—that's a common problem on these engines.

I swapped to a YTZ14S in my 2006. It's a little smaller physically but fits with a foam spacer and has higher CCA. Cranks way better in winter. Just make sure your cables reach.

Don't overlook the ground cable. Clean it up before buying a battery. I chased a slow crank for weeks only to find a corroded connection at the frame.

For farm work and trails, the stock battery is fine. Save your money. If you want peace of mind, get a Yuasa or a quality AGM battery from a reputable brand.

I disagree with the YTZ14S suggestion—it's thinner and can rattle around if not secured. I'd rather get a heavy-duty version of the YTX20L. They make a high-CCA version that drops right in.

Make sure to check the date code on any battery you buy. Even new ones can sit on a shelf for a year and be weak. I got burned once with a dead battery out of the box.

If you ride in really cold temps, consider a battery tender. It'll keep the battery topped off and extend its life. My Rancher starts like a champ even at 10°F now.

What year is your 420? The early 2000s models had a different battery tray than the later ones. Confirm compatibility before ordering online. I learned that the hard way.

I run a lithium battery in my 2008 Rancher. Weighs nothing and spins the engine fast. But you need a charger that works with lithium, and they're pricey. Not for everyone.

Honestly, just get the cheapest AGM battery that fits. These quads don't draw much power. I've had a no-name brand in mine for three years with zero issues.

Be careful with lithium—if your stator charges too high, it can damage the battery management system. I'd stick with AGM unless you know your charging system is solid.

Check the battery terminals too. The stock ones are small and can corrode. I replaced mine with brass terminals for a better connection. Helped with cranking.

I put a Big Crank ETX20L in my 420. It's a direct fit and has 300 CCA. My old battery was 220. Noticeable difference on cold mornings. Not expensive either.

If you upgrade to a higher CCA battery, make sure your starter can handle it. More power isn't always better—it can stress the starter gears over time. Just a thought.

I've had good luck with the Mighty Max YTX20L. It's affordable and has lasted two seasons so far. But I keep it on a tender when not riding for a week or more.

The group size for the 420 is typically YTX20L-BS. That's what my manual says. Any deviation and you're gambling with fitment. Measure your tray if unsure.

I bypassed the whole issue by installing a quick-disconnect and using a jump pack on really cold days. Not a permanent fix, but it works until I need a new battery.

Don't forget to fully charge any new battery before installing. A lot of people skip that and wonder why it dies fast. AGM batteries need a proper initial charge.

I had a bad cell in my OEM battery after two years. Replaced with a Deka AGM. Fit perfectly, and it's been solid for four years now. Worth the extra few bucks.

Before you buy, check if your quad has any aftermarket accessories draining the battery. A winch or lights can pull more than stock. Might need a bigger battery if you have extras.