Ryobi FAQ: 6 Mistakes I Made with Lawn Mower Batteries, Pressure Washers & a Sump Pump Check Valve

Ryobi FAQ: 6 Mistakes I Made So You Don't Have To

I've been buying, using, and occasionally breaking Ryobi equipment since 2017. Not as a reviewer—as someone running a small home-maintenance and renovation crew. Over the years I've bought the wrong battery for a lawn mower, nearly replaced a pressure washer that was never broken, and installed a sump pump check valve in exactly the wrong spot. This FAQ is the checklist I wish someone had handed me. Jump to whichever mistake matches your current headache:

• Which Ryobi battery do I need for my lawn mower?
• My Ryobi pressure washer won't turn on—what do I check first?
• What oilless air compressor parts actually wear out?
• Is the Ryobi automatic screw gun worth it for a small shop?
• Where should the check valve be on a sump pump?
• Do I really save money with Ryobi battery deals?

1. Which Ryobi battery do I need for my lawn mower?

Check the platform before you check the price. Ryobi runs two main battery families: the One+ 18V system and the 40V outdoor system. An 18V lawn mower takes One+ 18V batteries—the same pack that fits the drills, saws, and the rest of the green lineup. A 40V mower takes 40V batteries, which use a completely different shape and connector. The 40V pack won't fit 18V tools, and the 18V pack won't power a 40V mower. They are separate worlds.

My mistake: I bought a 40V battery because I figured "bigger is better." It sat on a shelf for four months before a store accepted the return. Seeing the One+ pack next to the 40V slab side by side finally made me understand why the model number on the mower deck matters more than the price tag.

Also worth thinking about: runtime. An 18V mower with a small-capacity battery can die halfway through a damp yard. A higher-capacity 18V pack (4Ah or 6Ah) gives you more run time, but also more weight. Buy the pack that matches the size of the area you actually mow, not the biggest one on the rack.

If you're just getting started, the One+ 18V platform is where most people should begin. The 40V system makes sense for larger lawns and heavier outdoor equipment, but know going in that you'll be storing two battery families from day one.

2. My Ryobi pressure washer won't turn on—what do I check first?

Check the reset button first. Every time. The GFCI built into the plug—and sometimes the wall outlet itself—can trip without looking tripped, and the machine will seem completely dead. I once ordered a replacement before checking the GFCI on the original. That is not a proud moment.

Here's the troubleshooting order I use now:

1. Press RESET on the GFCI plug and on the wall outlet, even if the outlet looks like it should be working.
2. Plug directly into the wall. Skip the extension cord. A heavy-duty cord can still rob enough voltage to keep the motor from starting.
3. Squeeze the trigger. Many electric pressure washers only energize the motor when the trigger is pulled. It won't "turn on" until you squeeze.
4. Let it cool down. If the unit ran hot or sat in direct sun, a thermal cut-off may have tripped. Give it 20 minutes.

One thing not to do: don't sit there flipping the switch and yanking the trigger in a panic. If there's no water flowing, the pump seals can run dry. Wait for the reset to click, make sure the water supply is open, then try again.

So glad I double-checked the outlet before returning that unit. I came within a day of paying for a replacement I didn't need. Now I tell everyone: troubleshoot before you spend.

3. What oilless air compressor parts actually wear out?

Oilless compressors don't have oil changes, but that doesn't make them maintenance-free. The idea that there's nothing to replace is tempting—and wrong. Parts I've personally swapped on oilless compressors, including my Ryobi:

• Air filter – the foam or felt intake filter clogs with shop dust. Clean or replace it about once a year.
• Check valve – when the compressor runs but won't build pressure, this is my first suspect. Cheap part, common failure.
• Pressure switch – if the unit cycles oddly or won't start on its own, the switch is often the problem.
• Pump rings / head gasket – the big one. On heavily used units, the pump eventually loses compression, and that's usually when people buy a new compressor.

Before ordering any parts, read the model number off the tank or frame. I've bought the wrong air filter once because I was so sure I'd remember the model. The box was right there. The part wasn't.

I once spent a weekend chasing a "broken" compressor. Replaced the regulator (about $45), then the gauge (about $18). It still wouldn't build pressure. The actual problem was a $12 check valve that took 15 minutes to swap. Honestly, I'm not sure why I didn't test that first. My best guess is I assumed expensive parts fail before cheap ones. They don't.

4. Is the Ryobi automatic screw gun worth it for a small shop?

My first outing with an auto-feed screw gun looked like a jam festival. Constant jams. I'd bought the cheapest collated screws I could find, and the tool choked on them. I was ready to bin the whole idea.

Then I tried quality collated screws and cleaned the feed nose the way the manual says. Night and day. For jobs like drywall, sheathing, or subflooring—hundreds of identical screws—the Ryobi auto-feed screwdriver saves serious time. For one-off furniture or small repairs, you don't need it. It's a specialty tool, not a daily driver.

Part of the bargain is learning your screws. Collated strips are held together with plastic or paper, and cheap strips can break mid-feed, leaving you to clear the mess. If the tool keeps jamming, that's usually the first thing to change, not the tool.

Small shops ask me about this a lot. Here's the honest part: you don't need a big first order to justify joining the Ryobi system. When I was starting out, my early tool purchases ran $70 to $120. A local dealer treated those small orders seriously anyway—and that shop has had my business for years. Small doesn't mean unimportant. It means potential.

5. Where should the check valve be on a sump pump?

Close to the pump. As a general rule, on the discharge pipe, about 12 to 18 inches above the pump outlet—or whatever the pump manual specifies. The valve's job is exactly this: stop the water in the discharge pipe from draining back into the pit when the pump shuts off.

Put the valve too high (a few feet up, or after the pipe exits through the wall), and the water below the valve falls back into the basin. The pump then pushes the same water again on every cycle. That causes short cycling, extra wear on the float switch, and wasted electricity.

My first install had the check valve four feet up the discharge line. The pump cycled every 30–45 seconds. I blamed the float, the switch, the pump itself. A friend with more sump experience took one look and said: your check valve belongs near the pump. Moved it down. Problem solved. I felt kinda ridiculous—I'd turned a $14 fix into a full weekend of frustration because I didn't ask this question first.

If you have a choice of valve, a spring-loaded check valve is usually a better bet than a cheap flapper style. The spring closes the valve even when the water is moving slowly. And whichever you use, point the arrow away from the pump. That sounds basic, but it's worth saying.

Take the position guidance with a grain of salt—I'm not a plumber or an engineer. But I've compared my wrong install against a correct one side by side, and the difference was obvious.

6. Do I really save money with Ryobi battery deals?

Sometimes. It depends on whether you actually need the tool. The free-battery-with-bare-tool promos are a regular part of the One+ ecosystem, and I'm not saying the deals are fake. Per FTC advertising guidelines, claims have to be truthful and substantiated. The trap is buying something just because the bundle looks like a bargain.

I did exactly that once: bought a tool I didn't need to get an extra battery. Three years later, that tool has been used maybe twice. The battery, though? Still in the rotation. The deal was fine. The tool was a waste.

If you're building the One+ system on a budget—particularly as a small operation—look for kits that include a battery and charger when you're starting out. Once you've got battery stock, bare tools are usually the smarter buy. And if the bundle is the only reason you're even considering a tool, it's not a deal. It's a distraction.