Yes you can. I answered a similar question to this a few weeks ago. The mAh figure is simply the capacity of the battery. So long as it's the correct dimensions and voltage - it will be fine. I have a Sony Ericsson mobile - which had a 600 mAh battery in it. I replaced it with a 950 mAh battery - which has extended the time between charges.
Milliamps Hour (mAh) is important because it's the easiest way to distinguish the strength or capacity of a battery. The higher the mAh, the longer the battery will last. Batteries with different mAh ratings are interchangeable. If your battery is rechargeable then the mAh rating is how long the battery will last per charge.
Milliamps Hour is 1/1000th of a Amp Hour, so a 1000mAh = 1.0Ah
Think of a cars gas tank. Voltage is how much gas is being used, and mAh is the size of the gas tank. The bigger the gas tank (mAh) rating the longer the device will run. If your battery is rechargeable, then think of the gas tank as refillable (rechargeable).
I don't see any reason why not - as long as the voltage is correct, and the battery is capable of producing the required current (measured in ampere, or mA). You certainly MUST check those, especially the voltage; if the voltage is too high, it may burn out whatever you connect to it.The mAh is simply an indication of how much energy the battery can store.
Yes - but it will not last as long as the 1000mAh battery.
Yes.
No reason why not. So long as the physical size of the battery matches, and the voltage it delivers is the same - you should be able to replace it with the higher mAh battery.
Yes as long as both the 2450 mAh battery and 600 mAh battery have the same voltage. The larger one will just last longer and take longer to charge up (I am assuming these are the solar powered type lights).
Sure, if they have the same voltage.
can use 1400mah battery to replace 760 mah
No
Yes and no. The higher capacity battery will last longer, but you need to consider the charger. It depends on the design of the circuit.
A 600 mAh battery can produce 75 mA for about 8 hours. If it is called upon to deliver 600 mA, it will last somewhat less than one hour. This is because ampere-hour ratings for batteries are, by standard agreement, normalized to an eight-hour rate. The actual rating is only a comparative rating, so you could properly say that a 900 mAh battery, for instance, will last 1.5 times longer than a 600 mAh battery.
mAh stands for milli ampere hour and it is a measurement of how many milli amps of current a battery is capable of producing in one hour. Yes you can substitute a battery with a higher mAh current rating provided you use the same battery voltage.
Not a good idea. It will work but not as long as the 1000 mAh battery.
In general, no. The charger is designed for a specific battery profile, and it might not be able to properly charge and/or monitor the amount of charge if you put in a different battery.
With a charger specifically designed to charge this battery.
Yes, it mAh or Ah is how long the battery lasts, it does not affect performance.