HarryA

I enlarged the image off the Amazon.com but could not read it
https://www.amazon.com/Black-Decker-LCS1620-Lithium-battery/dp/B01M6TQPY2/ref=sr_1_3/141-0275392-4037060?ie=UTF8&qid=1499813460&sr=8-3&keywords=Black+%26+Decker+LCS1620
...but ebay.com has a readable image
http://www.ebay.com/itm/Black-Decker-LCS1620-20v-20-Volt-Lithum-Ion-Battery-Charger-NEW-/272090041874?epid=1640405275&hash=item3f59d48e12:g:mf8AAOSwawpXr3eh
 
120v @60hz 300ma
 
 

http://www.talkingelectronics.com/projects/SolarLight/SolarCharger-2.html

You points are well made; thanks.

On day one I found two voltage boosters on Ebay that gave more than 100 volts so I ordered both of them from China. The first  one I received was a 12v dc to 200 v dc. After connecting it up and adjusting it for 200 v I put a 100k resistor across the output  and got 2 volts output! It took a one mega-ohm load to keep 200 v.

The   second one (12v dc to 220 v ac) works well. I connected it to the 220v to 120v step down transformer and into a full wave bridge rectifier with a 100mfd capacitor and got 140 v dc; 9.6 volts input. With a 8.4 v NiMH rechargeable battery I get 128 v dc.
So I am happy with that  and  very surprised that the 50/60 hertz transformer works at all!