AGM Batteries | Over recent years across the market space, Lithium-ion batteries have gained more traction. To those that are unknowing, it can be easy to dismiss the Lithium-ion battery as an expensive alternative to VRLA, if looking at the amp-hour (Ah) rating. Though, Digging deeper, it becomes clear that there is much more than an Ah rating to consider when you want to choose the best battery or batteries for your specific application.

In the marine world ( where I have the most experience) the choice these days and especially with higher loads – often comes down to Lithium-ion vs. AGM. Gel batteries do have a lower sufficient capacity at a higher discharge current. They also cost about the same as AGMs, assuming both types are monoblocs, as opposed to 2 V long life gel cells.

In order to get 3.8 kWh of useable energy from an AGM battery, the battery would need to be twice that size because of the 50% DOD economy rule. For example, 3.8 x 2 = 7.6 kWh at 24V, meaning 7,600/24, giving a battery rating of 316.66 Ah. This moves closer to twice the rated capacity of the Lithium-ion 24 V 180 Ah. Note the aging of the batteries is not being taken into account as well as temperature derating, or the effect of a higher load. For AGM batteries, higher loads have a more significant impact than on Lithium. To learn more, see the section – Useable energy: effect on discharge capacity and voltage with differing loads, below. It is reasonable to say, based on these factors, that an AGM battery needs to be twice the Ah rating of a Lithium battery.

agm deep cycle battery


  • Spill-proof through acid encapsulation in matting technology
  • High specific power
  • Low internal resistance
    Responsive to load
  • Up to 5 times faster charge than you get with flooded technology
    Better cycle life than flooded systems
  • Water retention
  • Sandwich construction for vibration resistance
    Stands up well to cold temperatures
  • Less prone to sulfation if not reaching a topped charge
  • Has less electrolyte as well as a lead than the flooded version


  • Higher manufacturing costs than with a flooded
  • Sensitive to overcharging (AGM has a tighter tolerance than gel)
  • Capacity with a gradual decline (gel has a performance dome)
  • Low specific energy
  • Must be stored in charged condition

LITHIUM-ion Benefits


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VuDu® Energy is changing the game! Our 12V Lithium Marine Batteries come with a TEN YEAR WARRANTY and are suitable for any Marine application from luxury yachts and sailboats to bass boats and kayaks.


The VuDu® built in battery management system is marine grade for maximum strength and reliability. Designed to handle Heavy Duty High Amp Loads our advanced BMS allows customers to use 100% of the rated capacity while maintaining maximum performance and life expectancy of the battery.


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Vudu Promises



VuDu® replacement Lithium Ion Batteries have been in production and sold to commercial and consumer markets for nearly ten years.



VuDu® also takes great pride in understanding your concerns and demands. Please let us know how we are doing. Any suggestions or comments about our products are highly appreciated.


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VuDu® products are being used in hundreds of applications like Electric Vehicles, RV's, Boats, Cars, Robotics, Telecommunications, Military, Industrial, and Recreational equipment. Our track record of reliability, consistency, and quality is why we are the leading supplier of drop-in replacement lithium-ion batteries worldwide.

Browse Lithium Ion Batteries, the superior option over AGM!