Here at Machine Alley, we often talk to members with old (and new) bikes with a dead battery, some will opt for the factory Lead-Acid replacement, but many look at upgrading to a newer AGM or Lithium-Ion battery. There are a lot of myths and misconceptions about the three main types of batteries we see on bikes today, so we decided to share a bit about what we've learnt over the years working on our bikes.
When comparing Lead-acid, AGM (Absorbed Glass Mat), and Lithium-Ion motorcycle batteries, the best option depends on your motorcycle's requirements, budget, and riding conditions.
Here’s a breakdown of their features:
1. Lead-Acid Batteries (Traditional Wet Cell)
Overview:
The oldest type of battery, containing liquid acid electrolyte, and lead plates, which requires periodic maintenance by checking and topping up the electrolyte.
Pros:
Affordable: Generally the cheapest option available.
Widely Available: Replacements are usually easy to find.
Tougher: Better at coping with faulty or fluctuating charging systems.
Suitable for older bikes designed specifically for lead-acid batteries.
Cons:
Maintenance Required: Needs periodic topping up of electrolyte.
Leak-Prone: Electrolyte can spill if tipped over or damaged.
Fire Risk: When charging, lead acid batteries vent flammable gas
Heavier: Bulkier compared to AGM and lithium-ion batteries.
High Discharge Rate: If unused, lead-acid batteries can go flat very quickly.
Best for:
Budget-conscious riders.
Older motorcycles that won't work with modern batteries.
2. AGM (Absorbed Glass Mat) Batteries
Overview:
A type of lead-acid battery, but the electrolyte is absorbed in glass mats, making it spill-proof and maintenance-free.
Pros:
Maintenance-Free: No need to refill with water.
Spill-Proof: Can be mounted in any orientation.
Higher Cold Cranking Amps (CCA): Reliable starts, even in the cold.
Longer Lifespan: Typically lasts 3–5 years.
Safer Design: AGM batteries don’t vent flammable gases
Cons:
Costlier Than Traditional Lead-Acid: More expensive but worth the extra investment.
Heavier: Still heavier than lithium-ion batteries.
Best for:
Modern motorcycles or touring bikes that require dependable power.
Riders who prefer low-maintenance, durable batteries.
3. Lithium-Ion Batteries
Overview:
The newest and most advanced motorcycle battery type, known for its lightweight and high performance.
Li-ion batteries also have a far superior discharge curve meaning the battery voltage reduces very little until almost completely discharged, in contrast, a lead acid battery's voltage drops measurably throughout the discharge rate.
Pros:
Lightweight: Up to 70% lighter than lead-acid or AGM batteries.
Longer Lifespan: Lasts 5–10 years under proper conditions.
High Performance: Fast charging and high power output.
Low Self-Discharge: Retains charge during long periods of inactivity.
Maintenance-Free: No fluid or servicing required.
Cons:
Expensive: The initial cost is significantly higher.
Compatibility Issues: May require a compatible charging system or voltage regulator.
Cold Weather Sensitivity: Performance can drop in very low temperatures.
Least Durable: Susceptible to voltage fluctuations or impact damage, this can cause a chain reaction resulting in fire or explosion.
Best for:
High-performance motorcycles, racing bikes, and modern machines.
Riders who value weight savings, longevity, and minimal maintenance.
Summary Table
Feature | Lead-Acid | AGM | Lithium-Ion |
Cost | Low | Moderate | High |
Weight | Heavy | Moderate/Heavy | Very Light |
Maintenance | High | Low | None |
Durability | Moderate | High | Moderate |
Performance | Moderate | High | Very High |
Cold Weather | Moderate | High | Moderate |
Lifespan | 2–4 years | 3–5 years | 5–10 years |
Final Recommendations
Choose Lead-Acid if you’re on a tight budget, riding an older motorcycle, or suspect your charging system isn't up to modern standards.
Opt for AGM if you want a reliable, low-maintenance battery with better durability, and the ability to install in different orientations.
Go for Lithium-Ion if you’re seeking the best performance, weight savings, and long-term value. However, make sure your bike's charging system is suitable for Lithium-Ion batteries
Whichever battery you choose to go with, at Machine Alley we have the tools and experience to help you test, remove and install batteries on your bike. So next time you have a battery question, come down and say "Hi"!
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