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You sound pretty savvy in your troubleshooting. Take a look at this video. You may have a split in one of your three suction hoses. I tried to find a video for a DC24 but to no avail. These two models are pretty close and this video should help you out.
If by power loss you mean loss of suction power then I would check and either clean or replace ALL of the filters. Check and clean the rotating brushes and make sure all of the tubes are clear. Almost all suction loss is down to some form of blockage to the air passing through the cleaner and unless the air can pass freely through and exhaust properly, it will not pick up efficiently.
battery packs can be rebuilt by battery shops using better quality batteries or they may even have a new battery pack for your machine
go on line to e-bay and there may be battery packs there for your machine
Try running the battery all the way down by letting the vacume run in a corner or another room and even when it stops leave it on for a hour to drain the battery. Then shut the switch off and try charging the battery. Make sure the charger is putting out enough volts by looking at the rated output of the charger and while it is plugged in check it with a volt meter. If it does not hold a charge and the charger is putting out the right voltage you need to purchase a new battery for the vacume
You have dead nimh (nickle metal hydride) batteries. You
will need a replacement. You can test for this by removing the battery
and holding the power button for 15 seconds. This will restart the
charging cycle as if the battery were new. Allow to charge for 72 hours.