Yes, it is a direct replacement. The housing has the same size as the replaced lead acid battery. I use the charger I used for the lead acid batteries or a solar panel with a regulator. The rechargeable has a built in battery management system. So it is fairly unproblematic.
The solar panel has 10 W. I might upgrade to more power.
If it isnīt broken, it doesnīt have enough features yet.