How long will an unused but constantly charged lead acid battery last?

I’m having difficult finding how long a lead acid battery lasts if it is never discharged, and always being charged on the grid. Most resources say that a battery which is regularly being discharged to 70% capacity will last around 5 years. How many years could a lead acid battery survive for if it is never discharged at all and well maintained (e.g. constantly charging it)?

I want to purchase a battery for emergency use when the grid goes down, to provide 3-7 days worth of electricity for small devices. I do not intend to discharge the battery for normal use, only during an emergency. It would be great if I can just connect it to the grid and forget about it, such that it is always charged and ready to go if the grid goes down.

Lithium Ion batteries have a medium-high price but they only last two to three years if not used. I wouldn’t want to keep buying a big lithium ion battery every 2-3 years to plan for a once-in-a-lifetime emergency.

Lithium Iron Phosphate last up to ten years and seem to be a perfect candidate for my use case, however they are very expensive.

Lead Acid batteries are cheap but shouldn’t be discharged fully or else it reduces the life span. However I would intend on buying the battery only for an emergency and wouldn’t mind fully discharging it for the once-in-a-lifetime grid down event. I think under “normal” usage they last for about 5 years, but how long would they last if they were never discharged?

submitted by /u/pythonhalp
[link] [comments]I’m having difficult finding how long a lead acid battery lasts if it is never discharged, and always being charged on the grid. Most resources say that a battery which is regularly being discharged to 70% capacity will last around 5 years. How many years could a lead acid battery survive for if it is never discharged at all and well maintained (e.g. constantly charging it)? I want to purchase a battery for emergency use when the grid goes down, to provide 3-7 days worth of electricity for small devices. I do not intend to discharge the battery for normal use, only during an emergency. It would be great if I can just connect it to the grid and forget about it, such that it is always charged and ready to go if the grid goes down. Lithium Ion batteries have a medium-high price but they only last two to three years if not used. I wouldn’t want to keep buying a big lithium ion battery every 2-3 years to plan for a once-in-a-lifetime emergency. Lithium Iron Phosphate last up to ten years and seem to be a perfect candidate for my use case, however they are very expensive. Lead Acid batteries are cheap but shouldn’t be discharged fully or else it reduces the life span. However I would intend on buying the battery only for an emergency and wouldn’t mind fully discharging it for the once-in-a-lifetime grid down event. I think under “normal” usage they last for about 5 years, but how long would they last if they were never discharged? submitted by /u/pythonhalp [link] [comments]Read More

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