nguyennam
Advanced Member level 1
Re: AA battery in parallel
wanchope, you seem do not understand why not try to connect batteries in parallel: all batteries of the same label, same manufacturer, and maybe same manufacturing lot, are not the same, they are different from each other in voltage, internal resistance, capacity.
So, when connected in parallel, all batteries do not contribute their capacities but the lower voltage batteries will draw current from the higher voltage batteries, so this set of batteries will supply very small current to outside load in comparison with their total capacities. On the other hand, with such batteries with small internal resistance as lead-acid or NiMH, Li-Ion, they may explode.
You can use diode to prevent the higher voltage batteries from charging the lower voltage batteries, however, you cannot improve the case: only the highest voltage batteries, not all, will source current to the outside load. Plus, you will waste energy with the diode drop - it becomes very significant when you use the low voltage batteries such as D/AA cells, or 3.6V Li-Ion batteries.
As you seem do not trust what people say, so you had better to make some experiments, and you will know the truth.
nguyennam
wanchope, you seem do not understand why not try to connect batteries in parallel: all batteries of the same label, same manufacturer, and maybe same manufacturing lot, are not the same, they are different from each other in voltage, internal resistance, capacity.
So, when connected in parallel, all batteries do not contribute their capacities but the lower voltage batteries will draw current from the higher voltage batteries, so this set of batteries will supply very small current to outside load in comparison with their total capacities. On the other hand, with such batteries with small internal resistance as lead-acid or NiMH, Li-Ion, they may explode.
You can use diode to prevent the higher voltage batteries from charging the lower voltage batteries, however, you cannot improve the case: only the highest voltage batteries, not all, will source current to the outside load. Plus, you will waste energy with the diode drop - it becomes very significant when you use the low voltage batteries such as D/AA cells, or 3.6V Li-Ion batteries.
As you seem do not trust what people say, so you had better to make some experiments, and you will know the truth.
nguyennam
