I think that L&M decided to not put any type of capacitor in the charging circuit at least on the early versions, and both terminals have major corrosion on some of my lights. On the L&M page they say
How to remove contact corrosion:
You can make our own cleaning solution by mixing a few drops of 25% vinegar / 75% water. With a small amount of this mixture and small piece of fine steel wool, you can gently remove corrosion and get these battery contacts shining like new!
What is the best way to dry my Sola?
After you have rinsed thoroughly, it is also extremely helpful to dry the light off. Residual water droplets can lurk inside the small space of the charge contacts and cause corrosion.
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