Basically meant the same thing.
I've been recycling the battery banks sold around here ~$2/ea. The batteries in them are the worst possible. SO when people pitch them , I play catch
.
Along with small 6 and 12 volt solar panels, I can replace the battery with one from an old Laptop battery bank , and charge them. WE have cute little clear wine bottle lights around the house that are charged in this manner.
When I am given laptop batteries, split them up into single batteries, put them on the solar charger for about a week, then let 'em sit for a few days to see if they're holding a charge. IF they're within 1 volt I keep them, if much lower they're carted off to a recycler
My current project is build up a 12Vdc battery bank with these cast off laptop batteries so I can run my 12V 0.750a (750ma) LED grow light setup off of these. Plus I have airstones that run only 60mins a day. Those are currently 110Vac and I use a cheapo 12 100 watt inverter that runs it.
I am looking at the 3~4 board on ebay . I figure that with one of the older H.F. 15 watt solar panels I can let it charge and run everything from it. I know the panel is old and output sucks,,, better than just throwing it away.
Thanks for the info on the resistor info too.
Cheers
Bruce S