No, They do not use colored lenses. They use Red,Green and White LED's so you get the brightest lights possible. You can however buy LED modules to change the color or your light.

No, The batteries can be charged at any time as they don't have a memory. When you notice your light is much dimmer then with a fully charged battery it is time to charge them. Please note that our batteries have a protection circuit in them so they can not be discharged too low. When the battery gets too low the protection circuit kicks in and cuts the power off.