I know this has been suggested (and rejected) many times, but I think this is an element that we really need.

In case you don't know what it does:

• When it is sparked by PSCN, its life increases by 1
• Nearby particles of BACD will share life, like SPNG or GEL
• It will spark NSCN, decreasing its life by 1 each time.
• When BACD's life is low, it will release SPRK slower
• It's also a weak acid

Uses:

• Less overpowered batterys
• More stable reactor output

Just think of all the possibilities!

People have made rechargable batterys using existing elements, but they are big, unreliable, and if they break, they might just release infinite electricity.