Battery maintainer vs trickle charger vs battery charger

The three get mixed up all the time, and they do different jobs. This is the comparison from our own product page:

In short: a charger is for a battery that is already dead, a maintainer is for keeping a good battery healthy for weeks or months, and a basic trickle charger is older, simpler technology that can overcharge if you forget to unplug it. That is why most riders now use a maintainer (sometimes called a float charger, a smart battery charger or a battery tender) for winter storage.

Why batteries die over a Canadian winter

A battery left alone for five months does not stay full. It slowly loses charge on its own, and many modern machines have small electrical draws (a clock, an alarm, an ECU memory) that keep pulling on it even with the key off. By spring, a battery that was fine in October can be too low to crank the engine.

Snowmobiles are the other way around: the long sit is the summer, and in winter the sled often waits a week or two between rides in a cold garage. A maintainer does the same job in both cases.

Cold makes it worse. A low battery is harder on itself than a full one, and the manual for our maintainer is clear that you should never charge a visibly damaged or frozen battery. The simplest way to avoid all of that is to keep the battery full the whole time it sits, which is exactly what a maintainer does.

A quick reference from the same manual if you have a voltmeter: a fully charged 12V lead-acid battery reads about 12.9 volts at rest, and a fully discharged one about 11.4 volts. If a 12V battery reads under 9 volts at rest, there is a good chance it is defective.

Our Smart Battery Maintainer (Battery Guard Genie)

Our Smart Battery Maintainer, the Battery Guard Genie, is built for powersport batteries and made to stay connected through the off-season. What its page and manual say it does:

• 12V, 750 mA, fully automatic, 3 stages. It first checks the battery (qualification), charges it up to 14.4 volts (bulk), then switches to float and holds it at 13.2 volts. If the voltage drops below 12 volts, it charges back up to 14.4 on its own.
• Lead-acid batteries of all kinds: wet cell, sealed, maintenance-free, GEL and AGM.
• Safety built in: spark-proof, reverse polarity protected, with a fire-retardant plastic housing.
• Quick-connect harness plus clips, so you can leave a lead on the battery and plug in without reaching for the terminals each time.
• Two-colour status light: red steady means it is charging, green steady means the battery is full and being maintained. A red light that keeps flashing means the battery is under 3 volts or the clips or ring terminals are not connected properly.
• 5-year warranty.

Know its limits too. It is for 12V lead-acid batteries only: the manual says never to use it on a 6V battery, and it is not made for dry-cell batteries. If your machine has a lithium battery, check with the battery maker what it needs. At 750 mA it is a maintainer, not a fast charger: the manual says a fully discharged 15 amp-hour battery takes about 16 hours to reach 80%, and it will not start at all on a battery under 3 volts.

How to hook up a battery maintainer safely

Read the maintainer's manual and your vehicle maker's instructions first, and follow them where they differ from this summary. The main points from our maintainer's manual:

1. Pick a safe spot. Somewhere dry and ventilated, away from sparks and open flame (not next to a gas water heater, for example). Place the maintainer as far from the battery as the cord allows, never above the battery, and never on a surface that can burn.
2. Keep it out of the wet. Do not expose the maintainer or its connections to rain, snow or very high humidity. A garage or shed outlet is the usual answer.
3. Route the cords where nothing can pinch, pull or step on them, away from moving parts.
4. Check the polarity of the battery posts before you connect anything. Red goes to positive, black to negative or to the frame, as your manual describes for your vehicle.
5. Make the battery connection first, and plug into the wall last. The manual is firm on this: do not plug the maintainer into the outlet until every other connection is made.
6. Check on it. The maintainer can stay connected for months, but look at the battery and the maintainer from time to time. If the battery is unusually warm or gives off a lot of gas, disconnect and let it cool. On a flooded battery, also check the fluid levels.

Fitting the ring-terminal harness means loosening the battery terminals. If you take the battery out, the manual says to turn off the accessories and remove the grounded cable first. Use eye protection, take off rings and watches, and keep metal tools from bridging the terminals. If you are not sure how your machine is wired, follow your owner's manual or ask your dealer.

Winter storage checklist

• Top up the battery before storage and connect the maintainer for the season.
• Cover the machine. For bikes stored outside, our outdoor motorcycle storage guide covers covers and shelters. For sleds, our snowmobile cover sizing guide shows how to measure.
• Follow your owner's manual for fuel, oil and tire prep. It knows your engine better than any general list.
• Glance at the status light every few weeks. Green steady is what you want to see.
• In spring, unplug from the wall, disconnect the lead, and ride.

Questions riders ask us

Can I leave a battery maintainer plugged in all winter?

Yes, that is what it is for. Ours is fully automatic and made to stay connected through the off-season. The manual still recommends checking the battery and the maintainer now and then during long storage.

Will a battery maintainer bring back a dead battery?

Not quickly, and not always. A maintainer is not designed for fast recharging of a deeply drained battery, and ours will not start on a battery under 3 volts. A 12V battery that reads under 9 volts at rest is likely defective.

What does the light mean?

Red steady: charging. Green steady: full and being maintained. Red flashing that does not stop: the battery is under 3 volts or the connection is not right. If the red light comes back after green, something may be drawing power from the battery, or a connection may be loose.

Can I use the same SAE lead for my heated gear?

Many riders already have an SAE lead on the battery for a battery tender or maintainer. Our SAE to Female Coax Adapter lets you power GEARS Gen-X3 or Gen-X4 heated clothing from that same lead, so one connection on the battery does both jobs. One owner wrote that it fit their battery tender's SAE plug. If your SAE lead has its own fuse, send us a message with your setup and we will check it with you. Our heated clothing FAQ explains the rest of the system.

Does it work on my ATV and my sled?

If the battery is 12V lead-acid (wet cell, sealed, maintenance-free, GEL or AGM), yes. Owners use it to keep their powersport machines ready to go, and one wrote that they were ordering a second.

You can browse more in our powersport accessories.