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 How Do Lithium-Ion and Lead Acid Batteries Compare?

In terms of efficiency and reliability, nothing can beat lithium-,unleaded-acid However for off-grid storage systems the lead-acid battery can be a better choice for several reasons. 

Both types of storage units store energy efficiently but both have their advantages and disadvantages. Here are some points of comparison between the two. Read on to know more.


Cost is one of the main factors that draw a line between the two. If you get two batteries with the same capacity, the lithium-ion battery will cost you three times more. Based on the size of the system you want to install it can increase your spending significantly.

Although lead-acid batteries have relatively low price tags, they cannot last as long as a counterpart.


The capacity of the battery pack refers to the amount of energy it can store. The great thing about these batteries is that they have a higher energy density than their equivalent. 

Therefore these units can store more energy without taking up extra space. So you can install more of these units in less space.

Discharge depth

The depth of battery discharge is the percentage of power that can be derailed-accidentally damaging the unit. 

The disadvantage of lead-acid batteries is that they can not be drained by more than 50%. On the other hand, lithium batteries can safely drain up to 85% of their capacity.


Another good point of comparison is the efficiency of these units. Unlike lead-acid batteries lithium-ion, batteries offer 95% more efficiency. In other words, 95% of the power stored in these units can be used. 

On the other hand, the second battery offers only 85% efficiency.


Just as batteries and solar panels continue to deteriorate over time. As a result, they lose their effectiveness. 

After charging a battery during a full discharge it is considered a single discharge lead-acid in terms of the number of discharge cycles lead-acid batteries cannot beat lithium-ion batteries. Therefore the latter lead-acid has a much longer lifespan.

Should I install a lead-acid battery or a lithium-ion battery?

If lithium-install a backup lead acid you can go for a lithium-ion battery or a lead-acid battery. However because the former offers a lot of benefits, you may not want lithium-acid battery packs. 

Although higher cost lithium-ion units offer a great return on investment, for many of the reasons explained above.

However, if you do not want to use your bat lead-acids quite often, your ideal choice might be lead-acid batteries.

This was a lead-acid comparison between lithium-ion batteries and lead-acid batteries. Hopefully, this comparison will make it easier for you to make the right choice. So if you can afford it you can spend more money and install lithium-ion battery systems.

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