Yes, that should cause no problem because the voltage is the same (a small discrepancy should usually be tolerable). The larger "mAh" rating simply tells you that the battery will last longer, for any given load.
the 300maAH is volt rechargeable battery is the highest true capacity battery
Current will go up by a factor of 6 times in that scenario.
If your load runs on 6 volts, you cannot replace it with a 12 volt battery. You will be exceeding the voltage rating of your load and will start a fire.If you want more amps (capacity) then you can wire more 6 volt batteries in parallel with the first.
as long as the battery fits it will work just fine
Remove Phillips screw in hand control and replace 9 volt battery
well, i don't really get your mean, if your lithium battery declines, you can replace it for a same capacity, working volt, and the part number.
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, it will overcharge the 6 volt battery.
The battery is a 12 volt.
No
1 volt battery does not exist.