Use only a genuine Yaesu charging dock and not any Third party charging solutions.
NiMh battery chemistry is quite tricky to charge properly, it requires the correct charge termination method and cheap chargers cannot do this.
It is quite easy to overcharge a NiMh battery which will drastically reduce its longevity.
Even charging the battery through the radio using the DC in jack can be risky as it could be overcharged due to it having an extremely basic charging circuitry and having no cut off, to do that safely without reducing the lifetime of the battery you would need to know how much charge is in the battery and time how long you need to charge it for,
I use a Yaesu CD-47 drop in cradle for my FT-60 and VX-170, these should be still available.?
