I think it was a thing where he put power into it, 'recharged', and put more in, 'recharged,' put more in, etc. In that way, using your terms, he started with 100 energy units, put in 5 at a time, and after a while had 40 in the ring and 90 left in himself (he couldn't 'recharge' all the way)
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"Come away! Let the cowards keep this city!"
-- Fëanor to the Noldor
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