These AA rechargeable batteries are specifically made for the “Titan Solar Light”. These are the exact replacement batteries that were installed originally. Please do not substitute any other “type” of battery in this light, it will not work. It is designed to work only with Ni-Cd (Nickel Cadmium) 1000 mA batteries. Most Titan Solar Lights run on 3 of these batteries. However, for a short period in 2019, our Titan Solar Lights were designed to run on 4 batteries. If you have one of these 4-battery lights, please contact us at firstname.lastname@example.org. Be sure to check your light to see how many batteries are needed before placing your order.