complicated issue, need solutions

some back ground: California in 2019 enacted a law that requires garage doors to be upgraded to include battery back up devices
 
problem: i have a newish lift master motor about 3 years old, that does not have the capability to have a battery back up and instead of forking out 800$ to replace it, id like to find an inline ac battery backup that will convert ac power to dc to stor and then convert it back to ac power to the motor. im wondering if this exists in some form. looking for out of the box solutions that still fit within california code.

id like to find an inline ac battery backup that will convert ac power to dc to stor and cosmetic surgery nyc  then convert it back to ac power to the motor.

Thx for the information I'll keep that in mind

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I have a Genie Liftmaster 1500.  While operating the garage door I noticed several issues and contact Genie for support. The solution was to replace the extension springs and replace the rollers.

 The old springs had white ends so I replaced them with the same. 

Now, the door opens just fine but when it closes it picks up speed during the last 2 or 3 feet of travel and slams down hard.

Should I replace the springs with higher rated springs for a heavier door?

Thanks!