AGM vs Lead Acid Batteries- Details!

Choosing between AGM and Lead Acid batteries is a worthwhile discussion to have. According to experts, the greatest alternative to lead-acid or flooded batteries for your motorbike is Absorbed Glass Mat, a maintenance-free battery. Because-

AGM batteries often have a longer lifespan than typical lead-acid batteries and also these batteries have a longer shelf life than flooded batteries because of their low self-discharge rate. With careful maintenance, batteries may last up to seven years. Flooded batteries, however, usually only last 3 to 5 years.

However, in this article, we will talk more about AGM vs Lead Acid batteries. Let’s find the differences.

What is AGM Battery?

One type of VRLA (Valve Regulated Lead-Acid) battery is AGM (Absorbent Glass Mat). It is placed between battery plates which replace liquid electrolytes. Yet, AGM Batteries are mostly used in today’s vehicles because of their advantages over flooded batteries.

  • The batteries are spill-proof.
  • They have minimal internal resistance and hence high-power output.
  • It takes less time when charging.
  • They are durable and have a longer lifespan.
  • Unlike lead-acid batteries, they don’t build up sulfation.
  • The batteries have a high production and manufacturing cost.
  • They have low tolerance if you are overcharging.

What is a Lead acid battery?

A lead-acid battery is also known as a traditional or flooded battery. It conveys the negative electrode of sponge lead. The specialty of this battery is it has higher cell voltage and lower cost. Here is more about the flooded battery.

  • They are cheap and easily affordable.
  • You can easily recharge them
  • It has a high power output capability.
  • They have a poor weight-to-energy ratio.
  • It has a low charging rate and takes 14-16 hours.

AGM vs Lead Acid Data Table

Properties AGM Battery Lead-Acid Battery
Specific Energy (Wh/Kg) 40 35-40
The energy Density (Wh/L) 100 80-90
Specific Power (W/Kg) 200 180
Charge/ Discharge Efficiency (%) 60-80 50-95
Energy/ Consumer-price (Wh) sealed vs flooded 15-25 7-18
Self-discharge rate (% per month) 8-25 3-20
Cycle durability About 350 cycle less than 340 cycles
Cost ($/KWh) 65 120

AGM vs Lead Acid- Differences

When comparing AGM vs. Flooded batteries, it’s normal that they have a resemblance in appearance. But besides the battery, there are many differences. Each type of battery has its own unique style, based on the needs of a user. The price, capacity, charging, lifespan, and materials of these batteries set them apart.


AGM batteries are more expensive than flooded lead-acid batteries. However, AGM batteries do not last as long the lead-acid batteries. Also, these batteries do not produce much gas in every charging phase. It is this luxury that you pay high for when buying an AGM battery.

On the other hand, flooded batteries are cheaper, but several responsibilities accompany them. First, you have to monitor the acid and water levels constantly. Also, there is the discharge of gases as you charge this battery.

As a result, they are cheaper than their AGM counterpart. Several factors contribute to the high charge, mainly due to maintenance issues. We have an article on Motorcycle Battery Maintenance.

Editorial Recommendation

Since service is the priority, we have no such clause for pricing. Our winning battery is the AGM battery from this Optima 8020 Batteries brand.

Battery Charging- AGM vs Lead Acid

Do you concern about AGM vs Lead-acid charging voltage? Well, AGM batteries require and can hold between 14.6 volts to 14.8 volts when fully charged. Where Lead-acid batteries have a standard holding charge of 13.8 to 14.4 volts.

AGM batteries can charge using a regular or standard charger similar to that of other batteries. Charging a lead-acid battery requires a direct current (DC) between 2.30 volts to 2.45 per plate.

However, you should understand the risks involved in charging using other charges. One of the most common risks is killing the cells of the battery. The sealed lead-acid battery has a reputation for storing charges for up to 2 years. Users should monitor the charge when not in use and ensure it does not discharge below 70% to avoid sulfation.

Editorial Recommendation

For the perfect batteries, you will need the perfect charger. Whether you have a Lead-acid Yuasa YUAM620BH YTX20HL-BS Battery or Weize Deep Cycle AGM 12V 100AH VRLA Battery, you need a suitable charger like Battery Tender Junior 12V Charger.


A 12 volts lead acid battery at 100% has a holding charge capacity of 12.70 volts. It is practically higher than its labelled capacity. Experts warn that a lead-acid battery should never be at full discharge as the cells may die.

Well, A 12 volts capacity AGM battery at 100% has a holding charge capacity of 12.80 volts. Most manufacturers warn that these batteries are highly affected by temperatures and that at 0%, the holding capacity is 11.80 volts. Discharging the battery completely could kill the cells.

Editorial Recommendation

The battery’s capacity description has always been 12 volts, 24 volts, or 36 volts. However, the amount they discharge at 100% is either higher or lower. The high charge is a common factor with all batteries. So, this Universal Power Group 12V AGM Battery wins this battle.


Many want to know about motorcycle AGM vs. Lead-acid battery life. Here, you will get the answer. The lifespan of sealed lead-acid batteries solely depends on the manufacturer. Generally, these batteries have a design life that grants them a lifespan of 3 to 5 years.

Under proper maintenance, the battery can last up to 12 years. However, some factors shorten the life of the battery, which include temperature. When kept charged and unused, the lifespan of an AGM battery is six years. The battery is also highly affected by high temperatures, which kill it or shorten its lifespan.

Editorial Recommendation:

Unlike their lead-acid counterparts, We recommend Weize- High-Performance motorcycle battery.

Final Thoughts

So, AGM vs Lead Acid- they are both great, but AGM is the best one. Lead acid has a low ratio of size to energy ratio or weight to energy ratio. However, AGM batteries do not need a lot of attention. We hope you find this article helpful.

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