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Certainly something isn't right. My Montana shows 100% after charging and won't switch off til the battery is depleted. With the supplied battery I was generally getting about 12 hours but as Boyd points out it depends on how it's set up.
They can be installed separately but you'll need to disable the Garmin ones, or remove them.
I believe you may be able to but it will need modifying as there is a switch inside which must be depressed. Probably easier to just charge them separately.
Yes if you download some 3rd party warnings, no if you're talking about the Garmin ones.
As Boyd suggests I suspect you've been very unlucky. You don't say where you bought these devices and I guess that could be an issue? I've bought many Garmin devices over the years and all with one exception have worked perfectly and continue to do so. The exception was due to a software issue which was quickly addresses by Garmin.