>
> Something that always worried me about them was the potential for them
> to vent gasses that would attack my mirror/coatings. So far, though,
> my coatings look fine. Anyone know what gasses are given off by
> lead acid or NiCad batteries during charging or use?
It has been a while since I had to design something with batteries in it, but I'm 99% sure the answer is they give off no gases during normal operation, and will give off a small amount of hydrogen if they are overcharged. I seem to recall the amount being something around 5 cc of H2 from a C cell under continuous overcharge.
As a side note, this was for a radio to be used on space station Fred, and NASA was very concerned about outgassing. Our safety engineer said that the astronauts were a bigger safety problem because humans will emit about a liter of methane per day.
>
> Lately, my batteries have gone south and I must replace them. I was
> thinking of just using the NiCads from my RC car instead. Since I am
> always forgetting to recharge the batteries, I thought it would be
> nice to have some batteries that I can quick-charge just before use
> (you can charge the nicads in 15 minutes).
>
>
>
> Bob L
>
Bob L
Bob Lombardi WB4EHS from Melbourne, FL (>- ))))))||| blombard@iu.net ................................Trying hard to live in an OJ-free zone