The good news about lithium-ion batteries? They put more energy into a refillable frame than other types of rechargeable batteries.
Many rechargeable batteries, with proper care, will last for a decade. Not so with ion batteries. The brightest stars on the horizon of rechargeable batteries, they performed brilliantly for two to three years and disappeared.
Difference in Refills
But during their short lifetime, ion batteries are quite user-friendly. They don't ask you to fully recharge before using it; most polymer lithium battery experience "memory loss". If you don't let it run out completely and then fill it completely, their energy capacity will gradually decrease.
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However, ion batteries, remember how full they are supposed to get, and even if you only have time to recharge a small portion of their energy capacity, the battery will be ready and can be filled to the full on the next charge.
Better yet, ion batteries don't require you to let them run out completely before being refilled; you will, in fact, destroy them if you do it! Other rechargeable batteries will require you to have a backup that is ready for use when the battery is first used up and sent to the battery charger; then you have to let the new battery run out completely before using the old one.
If your schedule allows you to do it without a non-ion battery that can be recharged during a four-hour visit to a battery charger, of course, you don't need to worry. But because it's usually impossible to know when the battery will run out completely, you might be caught in a very awkward situation if you don't have a spare battery.