Battery weights

lazza

Cant seem to find an answer on the web

If you had a starter battery and a deep-cycle battery of exactly the same dimensions, would the starter battery be alot lighter than the deep-cycle battery?

Similarly, if you had an AGM deep-cycle battery and a normal FLA deep-cycle of the exactly the same dimensions, how much heavier would we expect the AGM battery to be?

Thanks
Larry

westbranch

lazza said:

Similarly, if you had an AGM deep-cycle battery and a normal FLA deep-cycle of the exactly the same dimensions, how much heavier would we expect the AGM battery to be?

You will have to pick a brand, I know my maker has many detail table Ht, W, D, in mm's as well as weight of cells as well as in a 'unit' ( layer?  within a 12,24 or 48 config.)  AGMs have less H2SO4 than FLA,,,,

frick how do you turn "this formatting" off???

WaterWheel

A starter battery generally can produce a bit more power for it's weight and size.       A automobile rarely let's it's battery get below 80% charge so automobile batteries are less concerned about durability in deep discharge situations.      Automobile batteries generally also have higher "cranking amps" for starting your car and can put out a higher short burst of energy than a deep cycle battery. 

Deep cycle batteries, whether they are flooded or AGM, tend to have thicker plates in them to allow them to handle deep discharging better.

vtmaps

For a given amount of lead, you can have greatly varying amounts of surface area.  i.e. fewer but thicker plates versus more plates that are thinner.  More surface area (more plates) means higher discharge rates are possible, but also means shorter life if deep cycled. 

--vtMaps

inetdog

All other things being equal, a deep discharge battery for RE operation will have more weight lead per AH of capacity than a starting battery of the same voltage.
But the AH capacity of that battery may also be lower than the capacity of a starting battery of the same case size. 
A lot lighter? Depends on how you define that. Possibly 5% to 10%. But that would also be a design choice of the manufacturer.