How/why is it that two batteries with the same voltage may preform at different levels of power based on their amp hours? For instance, a 2Ah battery powering a weed eater at full charge, and the weed eater not working as powerfully as it would with a fully charged 4Ah battery?
Forgive me, I’m new to hobbies involving power tools but I’m excited to learn!
In: 4
Ideally both batteries should perform the same, difference being that one lasts twice as long before being empty. Ah literally stands for amp hours so if you drew 4 amps from them consistently the 2Ah battery would last for 30 minutes and the 4Ah battery for an hour
The 4Ah battery would likely have more cells in parallel, which in theory would allow it to push out more amps because it would split the load between the cells, but the weed eater shouldn’t push the batteries all the way to their limit and both should output as many amps as the weed eater needs.
Also as the battery gets discharged it’s voltage slowly goes down but with lithium batteries it isn’t that noticable, the voltage of a single cell is about 4.2V when fully charged and at around 3.6V it would be considered “empty” and discharging it beyond that would cause damage so any tool would cut out at that point to protect the battery
So tldr if the smaller battery is noticably weaker at full charge I would be slightly concerned
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