in middle school for a science project I converted non-rechargable batteries into rechargables. They all worked, they all held 80-90% of their original capacity

in middle school for a science project I converted non-rechargable batteries into rechargables. They all worked, they all held 80-90% of their original capacity. They all leaked/exploded 6 months later while they were idle in flashlights and rc cars. The chemistry is different but that experience taught me to be more careful with 'outside spec' electronics.