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running out of battery; battery depletion; going flat; loss of energy; depletion of stamina

solar cell

fuel cell

rechargeable battery

button battery; watch battery; button cell

air cell; air battery

D battery; D-cell; R20 battery

lithium battery

alkali battery

lithium-ion battery

nickel-metal hydride battery; NiMH battery

solid-state battery

voltaic cell

wet cell battery

primary cell; primary battery

mercury cell

cadmium standard cell

nickel-cadmium battery

paper cell

voltaic cell

reversible cell

nickel-cadmium battery; NiCad battery

lithium polymer battery

watch battery; button cell

nickel-cadmium battery; nicad battery

galvanic cell; voltaic cell

galvanic cell; voltaic cell

battery-operated; battery-powered