Storing Charge

There are a few ways of storing charge.
One way is to simply have a lot of wiring. Of course, this requires more space, can not be measured by a comparator, and can not be moved by hand.
The battery block stores a relatively small amount of power, and they come pre-charged. It is used in the crafting of motors. A comparator can measure how full it is. When broken, it will keep its charge.

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Battery Block

The leyden can store a large amount of power. It is quite cheap to craft, but is extremely inefficient. It also requires a large amount of power before it can even start charging. Like the battery, a comparator will measure how full it is, and it will retain its storage when broken.

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Leyden Jar