The Polaris Outlaw 90 uses a standard factory YTX5L-BS battery size that measures 4.49 inches in length, 2.76 inches in width, and 4.13 inches in height. This 12-volt youth ATV power source delivers roughly 70 to 80 Cold Cranking Amps (CCA) and 4 to 5 Amp-hours (Ah) of capacity. Squeezing an oversized case into the tiny under-seat tray will snap the plastic retention bracket, so sticking to true factory dimensions keeps your youth rider rolling without trailside headaches.
- Factory standard size is YTX5L-BS (metric: 114mm x 70mm x 105mm).
- Polarity layout is negative on the left and positive on the right with terminals facing you.
- Factory charging system outputs between 13.8V and 14.4V at 3,000 RPM.
- Sealed AGM batteries provide the most dependable cold-weather and vibration resistance.
Polaris Outlaw 90 Battery Size Chart
Youth ATVs have tight battery trays that leave zero room for error. If a replacement pack is even a quarter-inch too wide, the seat pan will crush the terminal posts or the rubber hold-down strap will tear under tension. Below you will find the direct dimensional and electrical parameters for the Polaris Outlaw 90 produced between 2007 and 2016.
Matching your replacement unit against this polaris outlaw 90 battery size chart guarantees that the seat latches properly and the cables reach without stretching.
Physical Dimensions and Case Codes
- Standard BCI/JIS Case Code: YTX5L-BS (or factory equivalent BTX5L-BS, CTX5L-BS, ETX5L)
- Length: 4.49 inches (114 mm)
- Width: 2.76 inches (70 mm)
- Height: 4.13 inches (105 mm)
- Weight: Approximately 4.2 lbs (1.9 kg) wet for AGM; 1.1 lbs (0.5 kg) for lithium
- Terminal Hardware: M5 or M6 stainless steel bolts with square capture nuts
Electrical Performance Specifications
- Nominal Voltage: 12 Volts DC across 6 internal lead-acid cells.
- Cold Cranking Amps: 70 to 85 CCA at 0 degrees Fahrenheit (lithium variants reach up to 140 CCA).
- Reserve Capacity: 4.0 Ah to 5.0 Ah on a standard 10-hour or 20-hour discharge curve.
- Resting Voltage Range: 12.6V to 12.8V fully charged (13.2V to 13.6V for LiFePO4 chemistry).
- Minimum Cranking Threshold: 9.6V under active starter load.
Always verify the physical tray before ordering a replacement. Some previous owners swap the mounting box for aftermarket aluminum brackets, but stock machines always require these exact YTX5L dimensions.
Terminal Layout and Specs
Terminal location matters just as much as case size. The Outlaw 90 uses a standard negative-left, positive-right polarity when looking at the front face of the battery terminals.
Polarity Orientation
If you accidentally buy a reverse-polarity battery (like a YTZ5S with mirrored posts), the factory negative ground wire will not reach across the plastic tray divider. Stretching the factory ground harness pulls the crimp joint loose inside the main wiring loom near the CDI box, causing intermittent spark loss.
Terminal Post Construction
Most YTX5L-BS units use lead alloy lug terminals with top and front mounting holes. I recommend threading your terminal bolts into the front facing holes on the Outlaw 90. Front mounting keeps the positive lead tucked away from the bottom of the plastic fender pan, preventing accidental rubs when a heavier kid lands hard off a jump.
AGM Versus Lithium Replacement Options
You have three primary options when picking a replacement unit for the Outlaw 90: Absorbed Glass Mat (AGM), Lithium Iron Phosphate (LiFePO4), and traditional flooded lead-acid. Flooded lead-acid batteries with vent tubes are completely obsolete for youth quads. Kids tip machines over, and spilled battery acid eats powder coat, weakens steel frames, and ruins pants.
AGM remains the standard choice for most parents. The electrolyte is suspended in fiberglass matting, which eliminates acid spills and dampens rough trail vibrations. Premium AGM brands like Yuasa, Deka, and Chrome Battery provide consistent starts even when the quad sits through cold fall mornings.
Lithium iron phosphate brings massive weight savings and spins the starter motor noticeably faster. What surprised me during my own testing was how quickly a lithium pack can drop to zero volts if your Outlaw has a weak key switch with small parasitic draw. Once a basic lithium battery drops below 8.0V without an internal low-voltage disconnect, ordinary smart chargers cannot recover it.
| Option | Pros | Cons |
|---|---|---|
| Factory AGM (YTX5L-BS) | Direct bolt-in fit, tolerates storage neglect well, completely spill-proof on steep hills, affordable price point under fifty dollars. | Heavier than lithium options, slower recharge rate from the small 80-watt stator, loses cold-cranking capacity below freezing. |
| Lithium LiFePO4 (LFP-5) | Cuts three pounds off the machine nose, higher 120-plus CCA output spins engine fast, very low self-discharge over months. | Costs twice as much, requires a dedicated lithium charger profile, permanently damages cells if drawn below 8 volts. |
| Standard Flooded Lead-Acid | Cheapest upfront purchase price at local hardware or auto supply stores. | Leaking acid destroys frame paint when quad rolls over, requires periodic distilled water fills, fails quickly under vibration. |
A quality AGM battery remains the smartest investment for standard backyard riding.
If you choose lithium, pick a brand that incorporates a built-in Battery Management System (BMS). A reliable BMS shuts down the cell output before a kid who left the ignition key turned on drains the battery into permanent scrap.
Installing Your New Pack Step by Step
Swapping a dead battery on the Outlaw 90 takes roughly fifteen minutes with basic hand tools. You only need a flat-blade screwdriver, an 8mm nut driver or socket, and a Phillips number 2 screwdriver.
Working on cramped youth ATVs requires steady hands so you do not drop small hardware into the engine skid pan.
- Remove the Seat Assembly: Reach under the rear fender behind the seat and pull the spring-loaded release lever. Lift the rear of the seat up and slide it backward to clear the front retention tab on the fuel tank.
- Disconnect the Old Battery: Always remove the negative (black) cable first using your Phillips screwdriver or an 8mm socket. Removing the negative cable first prevents accidental sparks if your metal tool touches the steel quad frame while loosening the positive (red) post.
- Unhook the Hold-Down Strap: Unclip the heavy rubber strap holding the battery into the molded tray. Inspect the rubber for dry rot or tears, replacing it if it feels brittle.
- Prep the New Battery: If you bought a dry-shipped AGM bottle-fill battery, pour the acid pack into the ports, let it stand uncapped for 30 minutes to vent gas, seal the strip tightly, and charge it at 1.0 amp until full.
- Drop into Tray: Seat the fresh battery flat on the bottom of the plastic battery box. Slide the square terminal nuts into the posts.
- Connect Positive First: Attach the red cable to the positive terminal post and tighten securely. Slide the red protective rubber boot down over the post to shield it from debris.
- Connect Negative Post: Bolt the black negative cable to the remaining post. A minor single spark when making contact is normal if the key switch is on, though your ignition should remain off.
- Apply Dielectric Grease: Smear a thin dab of dielectric grease or terminal protector spray over both connections to block corrosion from wet trail mud and wash water.
What most people get wrong during installation is reusing damaged or stripped terminal nuts. When you pull the old battery out, the square nuts often drop out of the posts and roll away. Always use the fresh stainless bolts and nuts packed in the box with your new battery rather than trying to force mismatched thread pitches.
Simple Habits to Prevent Premature Youth ATV Battery Failure
Small four-wheeler batteries carry tiny lead plates that sulfate rapidly when left in a partially discharged state.
The single most effective way to double your Outlaw 90 battery lifespan is plugging it into a dedicated automatic maintainer the moment your child finishes riding for the day.
A standard 0.8-amp or 1.2-amp smart trickle charger with a quick-disconnect SAE pigtail installed on the battery terminals makes maintenance effortless. Simply route the plug under the fender plastic near the rear grab bar. You can charge the machine without taking the seat off every weekend.
Keep the terminals clean and dry. Dirt combined with wash water forms a conductive film across the top case, slowly pulling voltage down over weeks of storage.
Frequently Asked Questions
What size battery goes in a Polaris Outlaw 90?
The Polaris Outlaw 90 uses a YTX5L-BS size battery. This 12-volt battery measures 4.49 inches long, 2.76 inches wide, and 4.13 inches high. It features standard polarity with the negative terminal on the left and the positive terminal on the right.
Can I put a larger battery in my Outlaw 90 for more cranking power?
No, the molded plastic battery tray under the seat cannot accommodate anything larger than the factory YTX5L-BS footprint. Installing a taller or wider battery prevents the seat latches from locking down safely and risks puncturing the battery case against the underside of the seat pan.
How long does an Outlaw 90 battery typically last?
A quality AGM battery lasts between two and four years when maintained on a smart trickle charger. Leaving the battery uncharged over winter or allowing the ignition key to drain it flat will cause sulfate buildup that ruins the cells in less than six months.
What is the correct charging voltage for a Polaris Outlaw 90?
A healthy Outlaw 90 stator and regulator-rectifier system should supply between 13.8 and 14.4 volts DC at the battery terminals while revving the engine. If reading below 13.0 volts at half throttle, check the stator output wiring and charging system ground connections.
Using our polaris outlaw 90 battery size chart ensures your youth quad gets the exact power source it needs for years of trouble-free trail riding.