Their lights are great but their batteries are pro...

Their lights are great but their batteries are prone to problems. I bought their system in 2015, and I still use the original battery pack daily. Since the original purchase I have bought 3 batteries (each costing hundreds of dollars) and all have had problems ranging from shorts to defective cells, to simply not turning on over time. The replacements I have bought through the company have not lived up to the original 2015 version. I have noticed the construction is different including the port for the light to plug in. I have just bought a 4th battery pack. I will probably go with a different system if the new battery pack doesn't outlast the original one I bought in 2015.