[hdhzy]

> There are some kinds of battery that only work at those temperatures - molten salt batteries. Used on earth for a few types of missile and some grid batteries.

Not an expert in batteries but Wikipedia says molten salt batteries provide high amount of power only for a short period of time:

> Once activated, they provide a burst of high power for a short period (a few tens of seconds to 60 minutes or more), with output ranging from watts to kilowatts.

Source: https://en.m.wikipedia.org/wiki/Molten-salt_battery

[marcosdumay]

Keep reading, until you get into the rechargeable configurations.

[hdhzy]

Actually I read the rechargeable section but there is no explicit mention there of how quickly does the rechargeable battery provide power. Is this implied that it's not in quick bursts because it's rechargeable? Or maybe I missed something? (I re-read the section again now).

[marcosdumay]

Yes, there is no mention because it's not very different from other technologies.

Molten salt batteries are mostly not practical (who wants to carry around some explosives at boiling water temperature), but the single use cells get some usage because of this feature. Rechargeable ones don't.