Zero time after the supply is diconnected.
It lasts as long as the power's turned on.
It is not possible to give an answer to this question without much more information. The information given (e.g. 1.5 volt weather radio) is unrelated to battery life.
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They are projected to last 100,000 miles. I do not know the replacement cost.
if you mean shelf life they last for years if stored properly
Yes it will, in the 12-volt position. But with the information given in the question, we can't estimate how long it will take.
The answer is going to depend on the size of the battery and what you are mowing. 12-volt batteries provide 30 - 40 minutes of mowing time; 24-volt mowers last 40 - 75 minutes; and 36-volt mowers run for up to 90 minutes. If your lawn is thick, lush or tall then the charge may not last as long.
Now adays about 36 - 48 months is all you get from one.
Yes. The bulb will be slightly dimmer, but will last much longer. Most 145V bulbs are intended to be used in 120V exit signs. The reason for the higher voltage rating on the bulb is because it will last a long, long time when used at 120V.
Without the amperage an answer can not be given.
12 volts is enough for a 12-volt 100-watt light bulb. It would not be enough for a 120-volt or 240-volt bulb.
The 2014 Chevrolet Volt is 14 ft. 9.1 in. (177.1 in.) long.
The 2013 Chevrolet Volt is 14 ft. 9.1 in. (177.1 in.) long.