Try charging at a lower rate of amperage, also check condition of battery with a battery tester, under a load.
No.
it wont work anymore. have it tested before replacing could be it is not being charged properly Most auto parts stores will test your battery and charging system for zip.
the battery may be getting old or you somehow overcharged it and destroyed the battery, or you used it before you charged it when you first got it. If you use it before charging it when you first open it, you could severely shorten battery life. Not just for a DS or whatever Nintendo thing you mean, but for anything chargeable.
No.
You should add water to a lead-acid battery before charging it. This is because charging can cause the electrolyte to evaporate and increase the risk of overcharging, which can lead to battery damage. Ensuring the water level is adequate before charging helps maintain optimal performance and longevity of the battery. Always use distilled water to avoid introducing impurities.
Before charging it.
No
This is a loaded question. The new battery should be charged, but it should not require charging, it should be charged between 80 and 100% when sold with out any extra attention. Most motorcycle batteries operate in thwe 80% to 90% charged range depending on how they are used.
No, the charger should not cause harm; but it will waste mains power.Rechargeable batteries should be allowed to be almost fully discharged before recharging. Recharging a partly charged battery will shorten its life.
Yes. Top up battery with clean water after charging only. Never top it up before beginning a charge.
When charging a battery, you should always connect the red cable first before the black cable.
No they don't they must be charged before they can be used