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Jayachar88,
To make the NE2/LDR light tight, shrink sleeve may work best. You may have noticed that this solution is just detecting mains on or off by a changed resistance of the LDR. It is not measuring voltage or current at all. The output (LDR) is totally isolated from mains (if built...
Take a look at the article below. On page 9 and 10 charging is explained. Page 10 contains a schematic with a LM317. It is a correct and safe way to charge a lead
acid battery and more efficient. Even more efficient solutions exist but they may be more complicated and expensive.
**broken link...
Another way is with a NE2 neon bulb with 180K in series and a LDR. Glue the LDR on the NE2 and seal it light tight. When mains is
available, the NE2 glows and the LDR will have a resistance of about 1K. When the mains fail, the LDR resistance will be 1M or larger.
Easy and safe to implement.
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