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Revive battery life on Wireless UHF system?

Apr 18, 2015
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This next week I have a number or rehearals, with a few 2+ hour shows the following week. The rehearsals are typicall 4 hours (or more). I usually run with three wireless systems, 1 uhf and 2 vhf. Until now a single system would hold up for an entire rehearsal. Twice in the last few weeks I had one transmitter die about 2 hours in and had to make an emergency swap-out (thank God for backups). But this system is less than 2 years old and I would have expected it not to crap out so early in its life. My oldest system (Lekato 5.8 ghz) is about 4 years old and keeps on going. Other than the early battery death, My UHF system functions fine.

Is there a way/trick to jump-start the battery and bring it back to its full charge potential to last more than 2 hrs?
 
Lithium ion batteries-non that I know of.
Nickel-chromium-there is a dangerous way that I’ve been successfully with about 50% of the time. It’s very dangerous, so you can YouTube it.
Remember it only work for Nicads that aren’t too old.
I have no Nicad devices/tools left in my tool bag.