Is the scoreboard supposed to hold a charge?

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Not sure what you mean by "hold a charge", but when I briefly tried it, the scoreboard appears to use nonvolatile memory. I set it to a random score, then I turned it off and unplugged it by removing the power cord from the scoreboard. Then I plugged the power cord back in and turned it on. When it came on, the score that I had set was still there. Nonvolatile memory is something similar to a USB flashdrive; no external power required to retain the memory.
If you are talking about actual electrical charges, the only elements in the device that can hold a charge are internal capacitors. Once you remove power from the scoreboard, the capacitors will eventually discharge through parasitic resistances in the circuit. I doubt that there is any intention on retaining an electrical charge once the power is removed.

Item Package Dimensions L x W x H	10 x 6.34 x 1.85 inches
Package Weight	0.37 Kilograms
Item Dimensions LxWxH	7.5 x 2.9 x 1 inches
Brand Name	BTBSIGN
Warranty Description	One year warranty
Model Name	BTB SIGN CO.,LTD
Color	blue
Material	Aluminum
Suggested Users	all
Manufacturer	BTB SIGN CO.,LTD
Included Components	remote
Outer Material	Aluminum
Size	1.5inch

Score Keeper Portable Led Digital Electronic Scoreboard with Remote for Sports Games Volleyball Table Tennis Baseball Basketball Scoreboards Home Guest

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