Double battery capacity~=double mass?

Thread Starter

Poor old sod

Joined Jul 25, 2017
141
I have a 40AH deep cycle battery, weighing 18.5kg. 100AH deep cycle battery weighs 40KG.
18.5*2.5=46.25 6.25kg short

Is something seriously wrong?
 

AlbertHall

Joined Jun 4, 2014
11,401
No. The 'error' is pretty small and there will be some economies of scale. Simplistically, two 40Ah batteries will need 4 terminals, one 100Ah battery will need only two. There will also be savings with the case and internal connections and mountings.
 

Thread Starter

Poor old sod

Joined Jul 25, 2017
141
No. The 'error' is pretty small and there will be some economies of scale. Simplistically, two 40Ah batteries will need 4 terminals, one 100Ah battery will need only two. There will also be savings with the case and internal connections and mountings.
this is for one only of each battery, just an approx scale up is this error significant. 6kg is a lot of lead plate, and much worse if it's an hybrid..
 
Last edited:

AlbertHall

Joined Jun 4, 2014
11,401
No.

From Wikipedia:
AAA alkaline cell, 11.5g, 860-1200mAh, average 1030Ah
AA alkaline cell, 23g, 1800-2600mAh, average 2200Ah

AAA has 1030Ah/11.5g = 89.6Ah/g
AA has 2200Ah/23g = 95.7Ah/g
 

Thread Starter

Poor old sod

Joined Jul 25, 2017
141
thank you,
I can just afford these bigger batts, It will have to wait-so far they're at the best price Delkor $235 ea local stock. I heard rumours that they only made hybrid batts for cranking and deep cycle, with labels to suit. hence the check.
 
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