To work a clock, remote control, flash, toys etc. batteries are needed. If you are a regular user, it is desirable to purchase NiMH (Nickel Metal Hydride) Rechargeable battery available as 2, 4 or 8 sets online with a NiMH charger per your requirement. I have a charger to charge 4 batteries together. But I purchased 8 batteries from Amazon. 4 pieces are under use and 4 pieces I keep fully charged.
NiMH battery discharge quickly if we keep the batteries idle inside the drawer for a couple of months. You need to recharge frequently and keep it ready for further use. Once you invest money you are able to use the batteries for a long period of up to 5 years.
Many years before Nickel-cadmium battery was common which is now being replaced by new technology which is eco-friendly and not hazardous to the environment.
An economic pack of 8 pieces of NiMh battery is available online from Amazon with the following link: https://amzn.to/3WBR5pc