Can my solar-powered watch/clock run on ordinary batteries?

Never use ordinary batteries for your solar-powered watch/clock. A solar-powered watch/clock uses a special rechargeable battery called the "secondary cell." If it is replaced with batteries of different kinds, your watch/clock may be seriously damaged.

However, some wall clocks and alarm clocks may run in combined use with an ordinary battery called the "primary cell." For more information, please refer to the instruction manual that came with your watch/clock.