Your neighbor wants you to sell him A Hot Rod Flashlight for Experienced Users Only
And the problem is, you can’t make your neighbor an experienced user.
Try offering him a metal box and a concrete block to set it on in his driveway — to put the charger in when he’s using it.
Show him recharging fireproof bag battery - Google Search and ask which type of safety equipment he’s planning to use.
Yeah, the experienced user knows to be careful, and may not always be perfectly careful without being reckless about using this stuff.
But your inexperienced neighbor needs an education before he needs a hotrod flashlight charger.