This patch is meant to make the game a bit easier and less frustrating. 
Applying this patch to Mega Man: The Wily Wars will make the weapon energy of all weapons restore fully whenever a life is lost. 
This mechanic is officially applied in Mega Man games for the PS1 and later. 

This patch is only compatible with the Wily Wars SRAM+ hack, by Ar8temis008. Get it here:
https://www.romhacking.net/hacks/3837/