For testing bulbs, fan motors, relays, and more, this 12v lantern battery setup has served me well for a couple years now. It’s been portable, cheap, and reliable. These days though, battery output has dropped to 11.5V. I’m not sure how low it can go before it stops being a useful tool. Other than using the car battery itself, any recommendations for a more robust power supply, or should I just replace the lantern battery and keep on keeping on?
