I have been looking at some datasheets for standard LR20 batteries and found that they seem to have a higher capacity when you decrease the load. Here are two graphs taken from two different datasheets that illustrate what I mean.
In the first graph it clearly states that I get more capacity when the load (Discharge) is decreased. In the second graph I can see that I get more than twice the service hours when the load is halved.
This brings me to my question. Say I have a portable stereo that uses 10 LR20 batteries in series and I can have it play for 12 hours on one set of 10 batteries. And say that I need to have it playing for 36 hours. So to solve this I will need 3 sets of 10 batteries. Will I be able to run the stereo longer if I build a battery pack that is 3x10 batteries (3 packs in parallel of 10 batteries in series)?
My thought is that by putting them in parallel I will decrease the load on each battery and therefore get more capacity out of each battery. Is there something I have missed or am I correct in assuming this will give me more battery capacity?