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1. Depends on the quality of the unit. Most use a modified sine wave converter. The label may state what type. But generally, modified sine is fine for most electronics these days.
2. Generally gel cells. They are sealed and more durable. The charging requirements are a little different for gel cells as opposed to flooded led acid batteries so they are not always interchangeable. UPS's usually have a built in trickle charger only to maintain the battery charge as it is expected that the power will be available most of the time.
3. Yes, but why? As stated above, UPS's have a built in trickle charger.
I am not sure what you are looking at doing but I will use an example here. I have a 1500 VA UPS for one of my computers. It is big and heavy. If it were only running a TV and DVD player, it would only run for about 1/2 hour before shutting down. I an not sure that they would make a good alternative for everyday use. They really are designed for temporary short term use, usually just long enough to shut down your gear in any outage longer than a few minutes.
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