# Has anyone developed a reliable deep space battery that doesn't need to be kept warm?

Has anyone developed a reliable battery for use in cold deep space applications? Something that doesn't need to be kept warm?

For exampe lithium batteries certainly has its constraints due to the temps but does Graphene or SS type applications help solve this issue?

I understand a company in China Guangzhou Auto Group has been working with China Carbon on the Graphene high density ultra cold applications and is Quantum Scape working on a SS version?

Thank you for photo Credit to: photographer, Adam Makarenko adammakarenko.com/photography image is Ice Probe I.

• Sorry, but -1 because a generator is not a battery. Mars rovers would be in a bad way if you took their batteries away and told them to run on their RTGs, because one function of a batter is to "buffer" energy from an RTG and then provide a higher level of power during "peak demand". If you embedded smaller radioisotope heat sources within conventional batteries you could keep them warm, but the question specifically asks for "a reliable deep space battery that doesn't need to be kept warm". I don't think there's even an unreliable one yet. – uhoh Mar 16 at 10:32