
I kept my old car's battery after changing the battery. I bought a cheap car charger, plugged it in and charged it. I used this adapter to connect a 150w inverter plug for regular basement use and small side projects. There are many car cigarette lighter adapters that would be interesting to invent. For example, a device to broadcast its own FM radio and play music on the radio via Bluetooth. An old car battery may not last forever, but it can be used in many ways. Find out where you store the battery and dispose of it in designated areas.

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