We don’t rush batteries out the door. We do five things so it works when you hit the button:

1. Fill with 1.265 SG electrolyte to spec.
2. Let it soak so the glass mat pulls in the electrolyte.
3. Slow, high-frequency charge (~900 mA) to form the plates.
4. Let it rest and verify it holds 12.6–12.8V.
5. Final check. Then it ships ready to install.

Pro Tip: Want it to last 8–12 years? After you park, plug in the included maintainer. That habit keeps it topped up and ready.

Want the full photo walkthrough? See our deep dive.

• Cold starts: Charged right, so it cranks in bad weather instead of clicking.
• Winches & add-ons: Stable voltage for plows, GPS, LED bars, and accessory draws.
• Vibration: AGM build handles washboard roads and trail hits without spilling or leaking.
• Mounting: Mount upright or on its side. Don’t mount upside down.
• Storage: Park it, plug in the maintainer, and it’s ready when you are.
• No-nonsense upkeep: Sealed. No acid. No water to add.

Direct replacements: YTX4L-BS, WPX4L-BS, CTX4L-BS, CYTX4L-BS, GTX4L-BS, YTX4LBSFP, M62X4B, ES4LBS, PTX4L-BS, and more.

Install tip: Tight spots? A threaded post or captive-nut shim makes the negative lead easier to secure.

Battery: 30-Day Full Replacement — no proration, no hassle. If it fails in the first 30 days, we replace it.

Charger: 1-Year Manufacturer’s Warranty on the BRS612 maintainer.

• Type: Automatic smart charger / maintainer / rejuvenator
• Input: 100–120 VAC, 50/60 Hz · Output: 1000 mA @ 6V/12V
• Size: 105 × 68 × 35 mm · Weight: 0.5 kg
• Approvals: UL/cUL, FCC, CEC
• Includes: Eyelet Plug Adapter for easy under-seat access
• 3-stage charging, then maintenance mode — won’t overcharge
• Protection: short-circuit, reverse polarity, overload
• Charger Warranty: 1-Year Manufacturer’s Warranty

More about the charger: BRS612 product page

• Chemistry: Lead Acid AGM / VRLA (Pb)
• Nominal Voltage: 12V
• Capacity (Ah @10hr): 3.5Ah
• CCA: 60
• Dimensions: 4.43″ L × 2.75″ W × 3.37″ H (112.5 × 69.9 × 85.6 mm)
• Terminals: Type 5
• Weight: 3.17 lb (1.43 kg)
• Brand: BRS Battery Ltd. / BRS Super Battery
• Storage tip: Keep it on the included maintainer if the machine sits.

Do I need to charge it before installing?

No. It ships charged and ready.

Why include a maintainer?

Machines sit. The maintainer keeps it topped up so it starts when you need it.

Where’s my model number?

On the face label (e.g., YTX4L-BS). This BRS4L-BS replaces that size.

How is this different from a cheap battery?

We soak, form, and test each one. No acid splash-and-dash. That’s why it cranks harder and holds charge longer.

How cold will it work?

AGM will run in tough weather. Keep it charged and it handles winter starts well.