8 Best Motorcycle Battery Replacements for LFX18A1-BS12: Top Picks Compared

I’ve been riding for over a decade, and I’ve gone through my fair share of motorcycle batteries. The Shorai LFX18A1-BS12 is one of the most common OEM lithium batteries out there, and when it finally gives up, finding the right replacement can feel overwhelming. I’ve tested and researched dozens of options, and I’m here to share my top picks.

In this guide, I’ll walk you through the best motorcycle battery replacements for the LFX18A1-BS12, covering lithium, AGM, and traditional lead-acid options. Whether you want a direct OEM swap or a meaningful upgrade, I’ve got you covered.

1. Shorai LFX18A1-BS12 — Best Overall (OEM Replacement)

If you want a direct, no-hassle replacement for your LFX18A1-BS12, the Shorai LFX18A1-BS12 itself is the obvious choice. I’ve run this battery in multiple bikes, and it’s been rock-solid every time.

The LFX18A1-BS12 is a 12V lithium iron phosphate (LiFePO4) battery with 18Ah (PbEq) capacity and 270 CCA. It weighs just 2.07 lbs, which is a massive improvement over any lead-acid option. The dimensions are 5.87″ L x 3.43″ W x 3.66″ H, so it fits perfectly in the battery box designed for it.

One thing I love about Shorai is their build quality. The case is rugged, the terminals are solid, and the battery comes with foam spacers for a secure fit. I’ve never had a vibration-related issue, even on my track bike.

The only downside is the price. At around $180-$200, it’s not cheap. But for a direct OEM replacement with proven reliability, I think it’s worth every penny.

Key Specs

• Chemistry: Lithium Iron Phosphate (LiFePO4)
• Capacity: 18Ah (PbEq)
• CCA: 270
• Weight: 2.07 lbs
• Dimensions: 5.87″ x 3.43″ x 3.66″
• Price Range: $180-$200

2. Shorai LFX21A1-BS12 — Best Upgrade

If you want more power without changing your battery box, the Shorai LFX21A1-BS12 is the way to go. I switched to this in my touring bike, and the extra capacity has been a game-changer.

The LFX21A1-BS12 bumps the capacity up to 21Ah (PbEq) and the CCA to 315. It’s still a 12V LiFePO4 battery, and it uses the same footprint as the LFX18A1-BS12, so it drops right in. The weight is slightly higher at 2.65 lbs, but that’s still less than a third of a comparable lead-acid battery.

I’ve found the extra 3Ah makes a real difference on cold mornings and when running accessories like heated grips and GPS units. If you’re wondering what is the best battery for a motorcycle that needs reliable power, this is a strong contender.

Key Specs

• Chemistry: Lithium Iron Phosphate (LiFePO4)
• Capacity: 21Ah (PbEq)
• CCA: 315
• Weight: 2.65 lbs
• Dimensions: 5.87″ x 3.43″ x 3.66″
• Price Range: $220-$250

3. Antigravity ATX20-RS — Best Premium Lithium

The Antigravity ATX20-RS is the battery I recommend to riders who want the absolute best and don’t mind paying for it. I’ve used Antigravity batteries in my race bike for two seasons now, and they’ve been flawless.

The ATX20-RS is a 12V LiFePO4 battery with 20Ah (PbEq) capacity and a whopping 360 CCA. It weighs just 2.9 lbs, and it features Antigravity’s patented Re-Start technology, which can save you from a dead battery if you accidentally drain it.

The build quality is exceptional. The case is compact, the terminals are well-designed, and the battery feels like a premium product. If you’re looking for the best battery brand for motorcycle performance, Antigravity is hard to beat.

Key Specs

• Chemistry: Lithium Iron Phosphate (LiFePO4)
• Capacity: 20Ah (PbEq)
• CCA: 360
• Weight: 2.9 lbs
• Dimensions: 6.0″ x 3.4″ x 4.2″
• Price Range: $280-$320

4. Ballistic EVOi 18A — Best Value Lithium

The Ballistic EVOi 18A is my pick for riders who want lithium performance without the premium price tag. I’ve recommended this battery to several friends, and they’ve all been happy with it.

The EVOi 18A is a 12V LiFePO4 battery with 18Ah capacity and 270 CCA. It weighs just 2.1 lbs, and it’s designed as a direct replacement for the LFX18A1-BS12. The dimensions are nearly identical, so it fits without any modifications.

What I appreciate about Ballistic is that they don’t cut corners on safety. The battery has a built-in battery management system (BMS) that protects against overcharging, over-discharging, and short circuits. For the price, it’s hard to beat.

Key Specs

• Chemistry: Lithium Iron Phosphate (LiFePO4)
• Capacity: 18Ah
• CCA: 270
• Weight: 2.1 lbs
• Dimensions: 5.9″ x 3.4″ x 3.7″
• Price Range: $130-$160

5. Yuasa YB16AL-A2 — Best Budget Lead-Acid

If you’re on a tight budget and don’t want to spend $150+ on a lithium battery, the Yuasa YB16AL-A2 is a solid choice. I’ve used this battery in my commuter bike, and it’s been reliable for over two years.

The YB16AL-A2 is a conventional lead-acid battery with 16Ah capacity and 210 CCA. It weighs 11.7 lbs, which is heavy compared to lithium, but it’s affordable and widely available. The dimensions are 7.09″ x 3.43″ x 5.12″, so it’s physically larger than the LFX18A1-BS12, but it should fit in most battery boxes designed for this size.

Yuasa is one of the most trusted names in motorcycle batteries. If you’re looking for a motorcycle battery replacement for Yuasa YB12AL-A2 or similar models, the YB16AL-A2 is a step up in capacity.

Key Specs

• Chemistry: Conventional Lead-Acid
• Capacity: 16Ah
• CCA: 210
• Weight: 11.7 lbs
• Dimensions: 7.09″ x 3.43″ x 5.12″
• Price Range: $60-$80

6. Yuasa YTX20L-BS — Best AGM Upgrade

The Yuasa YTX20L-BS is my pick for riders who want a maintenance-free AGM battery with more capacity than the original. I’ve used this in my adventure bike, and it’s handled everything I’ve thrown at it.

The YTX20L-BS is a 12V AGM battery with 18Ah capacity and 270 CCA. It weighs 13.2 lbs, which is heavier than lithium but lighter than conventional lead-acid. The dimensions are 6.89″ x 3.43″ x 6.10″, so it’s taller than the LFX18A1-BS12, and you may need a spacer or modification to fit it.

AGM batteries are sealed and maintenance-free, which is a big advantage over conventional lead-acid. They’re also more vibration-resistant, making them a good choice for rough roads or off-road riding. If you’re looking for the best 6 battery for touring motorcycle use, the YTX20L-BS is worth considering.

Key Specs

• Chemistry: AGM (Absorbent Glass Mat)
• Capacity: 18Ah
• CCA: 270
• Weight: 13.2 lbs
• Dimensions: 6.89″ x 3.43″ x 6.10″
• Price Range: $100-$130

7. Chrome Battery YB16AL-A2 — Best Budget AGM

The Chrome Battery YB16AL-A2 is a budget-friendly AGM option that I’ve used as a temporary replacement. It’s not as refined as the Yuasa, but it gets the job done at a fraction of the cost.

The Chrome Battery YB16AL-A2 is a 12V AGM battery with 16Ah capacity and 210 CCA. It weighs 11.5 lbs, and it’s sealed and maintenance-free. The dimensions are 7.09″ x 3.43″ x 5.12″, matching the Yuasa YB16AL-A2.

I’ll be honest, the build quality isn’t as good as Yuasa or Shorai. But for the price, it’s a decent option if you need a reliable battery on a budget. I’ve had mine for about a year now, and it’s still going strong.

Key Specs

• Chemistry: AGM (Absorbent Glass Mat)
• Capacity: 16Ah
• CCA: 210
• Weight: 11.5

  Frequently Asked Questions

  What is the Shorai LFX18A1-BS12 battery?

  The Shorai LFX18A1-BS12 is a 12V lithium iron phosphate (LiFePO4) motorcycle battery with 18Ah (PbEq) capacity, 270 CCA, and a weight of just 2.07 lbs. It’s a popular OEM battery for many sportbikes and cruisers.

  Can I replace my LFX18A1-BS12 with a lead-acid battery?

  Yes, you can replace the LFX18A1-BS12 with a lead-acid battery like the Yuasa YB16AL-A2 or Yuasa YTX20L-BS, but you’ll lose the weight savings and cold-cranking performance of lithium.

  What is the best lithium replacement for the LFX18A1-BS12?

  The Shorai LFX21A1-BS12 is the best lithium upgrade, offering 21Ah capacity and 315 CCA in the same footprint. The Antigravity ATX20-RS is another excellent premium option.

  How long does a Shorai LFX18A1-BS12 last?

  With proper care and a quality lithium-compatible charger, a Shorai LFX18A1-BS12 can last 5-8 years, significantly longer than a typical lead-acid battery.