Battery Charging, Discharging Time Question

Here is an image of a battery which discharged quickly:

An example of Energetic Disassembly

This battery now has an extended charge time.

What type of battery are you asking about? This information will help others to help you better!!

In general it is true that batteries that can discharge more quickly (safely) can also recharge more quickly (safely). But they also tend to recharge much more slowly than they discharge, especially if you are being careful not to overheat them.

I'm not sure that I would consider a battery's internal resistance to be constant. It is affected by heat, which is in turn affected by current draw or charging. Different battery chemistries react differently, so we should research specific chemistries before making conclusions.

The internal resistance is not constant. In 1970, in conjunction with an electric vehicle program that I started at Anderson Power Products, we were testing methods of determining the state of charge of lead acid batteries and we found that we could relate the battery capacity by plotting the internal resistance of the battery and when there was a "blip" in the curve, we were approaching the state of discharge. We also used the instrument as a "torque wrench" because you could see the sharp increase in the electrical resistance of a bolt as it is being stretched to the yield point. We also used the instrument to determine the life of a lead acid automobile battery by measuring the internal resistance.

Yes, in general it is true that a battery that charges quickly can discharge quickly, and vice versa The rate of charge movement ( current ) is related to the area of the surface of the battery that holds the chemical reaction being used, usually a metal being oxidized or reduced, such as lead, lithium, etc. A large area will have a thinner surface, and a small area will have a thicker surface of reactive material for a given amount of charge. Thus a battery of a given amount of charge can give a large current for a short time or a small current for a long time. An auto starter battery is usually a high current style, and a marine trolling motor battery would be a low current style. Of course if you operate a battery (or any electrical device) outside of its designed use parameters, there can be negative consequences.