A: I'm shur you can. But on a continues trickel charger, 7 volts is a little high in my experience. It expanded my batterys enough to not be able to remove them from the flashlight lanterns they were installed into. I am going to lower my trickle charger maintainers to 6.6 volts by way of adding an additional diode (into the cord of the charger) as they seem to have 0.4 volt reduction. It needs to be said that my lead acid 6 volt batterys are around 20 years old. I'm fussy about taking care of my stuff for longevity.
A: You may recharge the battery product with a 6V solar panel.
A: They sell 6v battery chargers for deer feeders. Very cheap
A: You can use a low-voltage trickle-charger for this battery product. We suggest for you to charger the battery for about 24-48 hours uninterrupted before use.
A: No, it is not included.