Rechargeable battery

Rechargeable battery

       A wiki link on the subject can be found at:  http://en.wikipedia.org/wiki/Rechargeable_battery

            And all cell and smart phones generally use rechargeable batteries, too.  Of course the cell towers and the entire network should be up, also. And if they networks are down, most smart phones are also used as a kind on mini-computer with its own energy demands.

            Now for a more simple approach if times should get hard.....

            Many will recharge their batteries using other sources, like local water power, solar power, wind power, etc. Recharging batteries will be a big deal as it applies to security situations, for example. Think of a cattle prod in the hands of the barter people moving around locally in discharge of their job. Most cattle prods are battery powered these days.

            Most of us will be happy with a charge level of like 98% vice 100%.

            All present batteries lose their charge over time. That's just the way things are. Hence, never expect a battery to be at 100%, for example.

            A practical time to recharge a rechargeable battery to like 98% is often about equal to the extra time to add the final 2%. Of course it depends on the battery and the charger, but a simple rule is about half-half, like if it takes 4 hours to get back to 98%, then it will take another 4 hours to get the final 2%.

            And many rechargers use a simple system, like high, medium and low. Many times low is also called trickle charge, like the last little bit to max out the battery. The reason is that one can overcharge a battery, and overcharging it often  ruins it.

            There won't be a test.