Can anyone suggest a diy circuit to charge an old 18vdc power tool battery? Charge was soaked and self imploded and can’t find another. Battery is good.
Battery part#. R8408-MG-15-06FXEW

Some advise would be awesome. I can build it but can’t design it

THANKS

 

This reference says it's a 12V SLA.
https://www.batteryuniverse.com/sealed-lead-acid/b-b/r8408-mg-15-06fxew-b-b-sealed-lead-acid-battery

 

This reference says it's a 12V SLA.
https://www.batteryuniverse.com/sealed-lead-acid/b-b/r8408-mg-15-06fxew-b-b-sealed-lead-acid-battery

Nope. Dr pic