It is the same if you have can recharge your battery or you buy disposable, the Bluetooth remote may require a AA battery or a Lithium 3.0V coin battery. It will depend on what type of remote you have.
RC remote control helicopter take AA batteries. On the average, I believe that they require about six batteries. What types of batteries is up to you.
Usually AAAUsually AAA
The most commonly used battery type in headlamps are AAAs. Many headlamps will require three AAA batteries to function, and will suggest using alkaline batteries.
Each remote takes ( 2 ) # 2016 batteries , they are coin style 3 volt lithium batteries
Bluetooth
2 'AA' alkaline batteries, I believe.
Yes in any hardware store there is a universal remote that could be use in any type of TV. You will also buy batteries depending on which type the universal remote use.
A 7.2 volt battery is used in most remote control cars. They are also called RC cars and some places sell RC batteries for these specific cars. There are most likely other batteries that can also be used.
A simple gift idea that does not require the use of batteries is jewelry or books. Food is one, art supplies is another. It all depends on the type of person it is.
You may need to enter a BlueTooth passcode from the keyboard. Hold down the connect or link button on the keyboard, and then go to the iPad. In Settings Bluetooth, look for the keyboard. It may ask you to type in a numeric passcode to pair the two together. Type this in, and the Bluetooth icon should light at the top of the screen. If you have done this already, your keyboard's batteries may be dead.
Battery. Analogue (needle type) Voltmeters do not require batteries to display results
SwatchBattery has a lot of coin type batteries. http://swatchbattery.com/ . My 2002 300M remote uses a CR2016 (3volt) battery which they carry.