Recently, I planned to buy an external flash, and found that all products use dry batteries (Sanyo's rechargeable batteries are so expensive). Why not use a lithium battery?

In fact, it is mainly because the No.5 battery is the most widely used and easy to obtain. Under comprehensive conditions, it is the most suitable battery for photographers to use flash under various conditions. 1: It is the most common and can be bought everywhere. Basically, this product can be found in grocery stores. 2. Rechargeable batteries are generally nickel-cadmium or nickel-hydrogen batteries, which are convenient to charge, have low requirements for equipment, can be quickly charged with large current, and have good safety factor. 3. Low cost, needless to say, although it is not as good as lithium battery in energy density, it is cheaper than complete battery+charger, and it is also convenient to set up flash charging system. 4. An important indicator of the flash is the return time, which is related to the power supply itself and is very important for photography. The internal resistance of lithium batteries is larger than that of Ni-MH and Ni-Cd batteries, and the high-current charging and discharging is definitely not as fast as these old batteries. In addition, ordinary lithium batteries can't discharge too much current, and power batteries are very expensive, so lithium batteries are not so attractive to nickel-cadmium and nickel-hydrogen batteries that can basically discharge in short circuit.

Hope to adopt