Hi, My Jitterbug flip phone will not charge up.
Do you know anyone with a similar Jitterbug?
It would help tremendously if you would try charging your battery in someone else's charger.
If the battery charges then your charger is the problem and not the battery. Useful to know.
I am assuming you have wiped all the contacts with alcohol or contact cleaner, to remove any thin film that might be interfering with electric conduction.
Quite often that persistently blinking charge light indicates a battery that has reached the end of its useful life.
If you buy a new battery be certain to charge it at least 14 hours before you ever put it into the phone.
I repair a lot of digital cameras, watches, cell phones, etc. And contacts that need cleaning or degreasing are quite common.]