The answer will depend on the battery, and the amount of power it is required to deliver.
It should last up to 4 hours are a constant usage without recharging.
The battery is supposed to last for 9 hours of continuous use. Recharging the battery is easy and can be done using any standard micro-USB cable. This makes it easy for you to recharge no matter where you are.
The Nintendo DS battery has been made to be recharged around 500 times, after which the battery life will be 70% of its maximum charge. The length at which a rechargeable battery will last depends on how frequently you charge it. For older devices, it is usually recommended to allow the battery to drain as much as possible before recharging.
Yes, If you use it for too long. It drains power from the battery without recharging it.
i is how long a phone can last playing music without it losing its battery.
You can't necessarily replace the battery of an iPad but it will last a very long time. But I wouldn't say forever
When I plug in my laptop, it does not use the battery to run the computer. Instead, it uses the wall outlet to run the computer and to recharge the battery. So, by leaving my battery in my laptop when it is plugged in, I am recharging my battery and not running it down. If you take the battery out of your laptop and do not recharge it, it will not last long. The computer batteries that I know about can go from 2 to 8 hours without being recharged.
It depends on how often you are using and recharging the battery. An average life span for a remote control plane battery is 6 months to 1 year long.
The Bosch PS50B battery lasts for rougly three hours without needin a charge. Over time the battery life will degrade.
about a year or two, then it will start to die really fast without a charger
For playback: around 40 hours for listening to music or around 7 hours if watching videos / playing games. The battery itself will last for many years depending on usage, ambient temperature, frequency of recharging etc. (See links below)
a car battery last for about 3-5 years