I don’t know if o lights charger will work with other batteries. But you could buy a 4 pack of batteries with a case and store it with the lights. And use a light to keep them charged up. When I first started this hobby. I had 2 lights both USB rechargeable. And K used them to charge my batteries until I got a charger. Which decent ones start at 5 dollars. And you’d always have a extra battery or two. Most sites for every 2 batteries you purchase come with a case