K1200s battery issues

Battery and changing spark plugs would be unrelated. First thing make sure the battery terminals are clean and tight. Charge the battery with a charger. You shouldn't need booster cables to crank a vehicle with a good battery.

Clean throttle body and MAF to try and fix the engine dying issue but suspect the battery first..

You say it is charged but my guess is your battery has died. And needs replacing. If you do not keep charged up they will not keep their charge.. I may use my camera once a month but I keep the battery on my charger most of the time.

3rd party battery?

some four wheelers require a battery to run correctly. sounds like you need a new one.

There is likely a little electronics within the computer itself that serves to control the voltage supplied by the external charger. This is often a a small, slim board and is not an uncommon failure.
Any competent tech should, in a few minutes, be able to determine if this board has failed. I would estimate the cost of replacing the board should be under $100 US unless you have high labor costs in your area.

the batteries dead. you need a new one because after the battery dies it wont awknowledge the charger or battery. same thing happened to me. honestly this phone is a piece of ****. youre gonna have a lot more problems ttrust me. im having a problem with it now.

you can get a new battery

its not an easy bike to get at the battery but there is some good news! there is a power take off plug on the bike if you hook up a charget to this it will recharge the battery,,,if its any good now? leaving a battery till it go's completly flat may mean it will never recover from that,,all the charging in the world wont help,,,the battery is under the seat tool box,,but i would use the power take off plug,,
"and here's a good tip,,,,,get a solor battery charger from e-bay,,,a 2.5watt will keep the bike ready to ride all year long,,,just hook it up and leave the solor sell out side in the weather, it wont hurt it and it will keep the battery fully charged all year round,,this also works on cars too,both my bikes have solor battery chargers hooked up to there batterys all year round
wow,,,some thing for free,,, free battery charging,,,!!,

It would be helpful to know just how quickly the battery is going flat, and I'm assuming there's no history of the phone having been damaged, but... Try swapping the battery for one from a friend's phone. If that cures the problem, you need to buy a new battery (they don't last forever). Otherwise, try charging the battery fully in a friend's phone using their charger, then see how long it lasts. If this lasts much longer, the problem is that the phone/charger combination isn't charging the battery properly. Mix and match chargers and handsets (mark which are yours before you start, or you will get mixed up) to identify where the problem lies. If the battery isn't old and tired, and the phone is charging it properly, then the problem must be that the phone is drawing excessive current. This could be because you've got it set up to do some power-hungry thing (backlight continuously on, playing MP3s or FM, promiscuously Bluetoothing or IR communicating, etc). Shut down all the functions you don't actually need at the time and see if that makes any different. Once you've eliminated all those, you're left with the liklihood that the phone has a fault which is making it draw excess current. Not good news, but at least you've eliminated all the other possibilities. A.

Could be battery or charger. 1. Buy new battery. Still in trouble? 2. Get new charger Its good to have two batteries