Batteries and rechargeable batteries are the main source of energy for mobile devices today, however we know very little about what they are and what the differences are between these power sources.
Briefly battery can be described as a disposable power source. The voltage level in a standard saline battery is 1.5 volts, but over time the voltage weakens and the battery is no longer able to power the device sufficiently for its normal operation. The cheapest are batteries with salt electrolyte, which is designed for a very weak and short-term load. Putting such batteries in a flashlight would be a big mistake - they are unlikely to last more than half an hour. Alkaline batteries, often referred to as "alkaline" batteries, are much better suited to heavy workloads. They are well suited for use in cameras and flashlights, and in order to extend their life, you can periodically replace them with another pair - this "rest" allows batteries of this type to replenish a small part of the energy spent. The most expensive are lithium batteries - they are almost as expensive as inexpensive batteries, but they also have a much longer service life than alkaline and saline batteries.
Batteries are certainly much more practical to use. They can be charged a large number of times and, if handled correctly, can last for a long time. Many are discouraged by the price of batteries, and such people prefer several sets of batteries. When buying batteries, you should always give preference to models from the best manufacturers, since batteries from little-known companies often have a very short life - crystals quickly form in them, reducing the effective surface, and thus the battery life is significantly reduced.
In this case, your choice should depend on the goal. For example, if you just want to take a camera for a friendly get-together, two or three sets of alkaline batteries are enough for you. In this case, perhaps, there is no point in spending money on batteries. But if a device is used constantly, you should not save on batteries, because they really pay off very quickly.
There are also many different manufacturers among batteries, among which it is sometimes difficult to make a choice. In this case, it is better just not to buy frankly cheap products, since the likelihood that such batteries will not work even five minutes is very high. And do not try to charge batteries - salt and alkaline ones will simply stain everything around, and lithium ones can even explode.
Despite the lower price for batteries, batteries are in almost all cases the preferred option - even if you bought dead batteries, they can always be quickly recharged and reused, and in the case of buying dead batteries, you will have no choice but to get rid of them. But if you are leaving somewhere where it will not be possible to charge the batteries, then, of course, in this case, you need to take care of several sets of good batteries..