Subtronic Mega Color, contemporary use and upgrades

Anyone still using these?

MASSIVE 350Ws power and adjustable color temperature! (is this most powerful production strobe ever?)

Over 2kg each and probably overkill for most shots.

I've just dusted these off, charged them up and they are holding power and cycling happily.

Was considering possible upgrades.. LED spotting light, lithium batteries. Anyone made these upgrades to old lights?

Love to hear your ideas, comments.

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Mine still charge too - but last less than 50 flashes on high power these days. They get occasional use as off-camera flashes.

Alex