On my very first gig as a 2nd AC, I used all the first AC’s tools and was lucky he had such a whole kit. There is not any proper answer and the answer you do provide you with will largely depend upon the job market you’re entering or inside. Remember, this isn’t going to lock you in, you’re simply making an attempt to save cash.
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You didn’t say what model or mannequin battery charger somebody was incorrect about. You should not purchase the low discharge Eneloops for solar lights. So 500 cycles would solely last you about 1-1/2 years. Charge it whenever performance starts to degrade, or earlier than if you’d like. Make sure you get a charger that treats batteries individually, not in pairs and that shuts off automatically.
I see a plethora of manufacturers, and fashions out there, and don’t relish regularly changing out batteries whilst balancing on a ladder . Like another commentators, worth has a lower priority/concern than ladder climbing frequency. Also watch out for batteries without overcharge safety. Sorry I don’t have more specific data, but there are a LOT of various tools on the market, and plenty of companies are bundling the 18650s for particular purposes, even photo voltaic electrical systems. Flashlights, electronics, laptops, vaping and even some electrical automobiles use 18650s.