Depends on the charging rate, in Amps, of your charger. Very simply, if the charger current is rated at 450mA, then a 450mAh battery would require 1 hour to charge. Take the batter rating (450mAh) divided by the charger current rating (450mA), which equals 1 hour. If the charger rating is only 100mA, then it would take 4.5 hours to charge the same battery.
It shouldn't take long, you have to plug it into Itunes first and it should already have some charge at first!
24 hr.
Charge it all the way till it's full
Yes, you can typically replace NiCd batteries with NiMH batteries in solar lights as long as the voltage and size of the batteries are compatible. NiMH batteries are a more environmentally friendly option and may provide better performance in some cases.
Leaving it to charge for around 3 hours will guarantee a full 100% charge.
Yes, your charger should be able to charge AAA 1800mAh batteries. It is common for battery chargers to be able to charge multiple capacities of batteries as long as they are compatible with the chemistry (e.g. NiMH, NiCd) and size (AA, AAA). Just make sure to follow the manufacturer's instructions for optimal performance and safety.
About 90mins
It typically takes about 2-3 hours to fully charge a Canon battery for the first time.
10 years
3-4 hours
Yes, as long as you use an NiCd charger, but you really shouldn't. NiMh has twice the capacity of NiCd and it is less expensive. NiMh also contains no toxic materials so it is better for the environment.
It takes 3-4 hours for the first time you charge it, i dont know how long it takes otherwise. sorry!