No, you will need two 12 volt batteries connected in series to give the 24 volts necessary to run the pump. It will not run on 12 volts.
Yes it is possible to use an inverter to run a sump pump. However it is a good solution because 120 volt pumps are very inefficient and your battery will soon be exhausted. A far better idea is to invest in a backup system with the most efficient 12 volt pump such as those from NexPump. These will pump up to 4 times as much water using the same battery.
No it cannot.
Install a 3 volt battery and forget any modifications. It will not operate on 12 volts.
The Volt has an auxiliary battery back-up that allows the electronic door locks to still operate.
The capacities of batteries are rated in amp hours. The higher the amp hour rating of a battery the longer the device connected to the battery will operate. Depending on what the connected load draw in amps is, will determine how long the connected device will operate.
This is not advised! The 9-volt charger might have a current limiter so that nothing burns up, but it any case if left on it will destroy the 6 volt battery by overcharging. A 6-volt charger is not expensive.
Yes, it can, but unless the battery has the same terminal layout, and the same physical attachment, it can't be done without lots of modifications.
No, the camera needs 7 volts and will not operate correctly on only 5 volts.
100% overvoltage to an electrical device is never a good idea. It would have to be a premium, heavily designed pump to put up with that for very long without burning up. You probably have a lot of money invested in the pump. Now you need to spring for the battery that it's designed to operate on.
No
if it is any think over 1 volt it is not a cell battery it is just a 6 volt battery if you had a 1 volt then it would be a cell battery
No.