It is a bit of a side track, but perhaps of interest, reducing the self discharge and decay for things that need to standby for years and then work at high current, there is a dodge where the battery is charged and then drained of electrolyte.

The ‘dry charged’ battery can then be brought back to life in a few minutes by re-admitting the liquid.  Battery makes often store them dry and then add the acid just prior to delivery.

The other one, I suspect of even less use is a primary cell where the solid electrolyte battery where the plates are embedded in a block of the electrolyte that is then melted when the battery is needed. This requires a starter fire, so applications are limited. https://en.wikipedia.org/wiki/Molten-salt_battery

Mike

It is a bit of a side track, but perhaps of interest, reducing the self discharge and decay for things that need to standby for years and then work at high current, there is a dodge where the battery is charged and then drained of electrolyte.

The ‘dry charged’ battery can then be brought back to life in a few minutes by re-admitting the liquid.  Battery makes often store them dry and then add the acid just prior to delivery.

The other one, I suspect of even less use is a primary cell where the solid electrolyte battery where the plates are embedded in a block of the electrolyte that is then melted when the battery is needed. This requires a starter fire, so applications are limited. https://en.wikipedia.org/wiki/Molten-salt_battery

Mike