You answered your own question. Sealed dry or gel type battery need no maintenance
other than keeping a full charge on them
On most modern sealed batteries you do not have to add water. On batteries that are not sealed you should check the battery monthly. If you have to add water only add distilled water and never tap water.
If the battery has caps and is not sealed check the level of the electrolyte. If it is low add only distilled water.
It stands for sealed maintenance free battery. You dont need to top up it.
If you need to jump start the car then the battery may be fully charged but it is defective and needs replacing. A full charged battery will read 12.6 volts at the posts with the engine not running. 12 volts indicates the battery is only 25% charged.
Yes, without being charged, a phone will run out of battery.
Most batteries today are sealed so a hydrometer is useless. A fully charged battery will read 12.6 volts with a digital volt meter. At 75% charge it will read 12.4 volts, at 50% it will read 12.2 volts and at 25% charge it will read 12 volts. But if you have another type battery then here is what you need to know. A fully charged golf cart battery or fork lift battery will read 1300 A fully charged auto or truck battery will read 1275 A fully charge cell phone tower or solar storage battery will read 1250
Most batteries today are sealed so a hydrometer is useless. A fully charged battery will read 12.6 volts with a digital volt meter. At 75% charge it will read 12.4 volts, at 50% it will read 12.2 volts and at 25% charge it will read 12 volts. But if you have another type battery then here is what you need to know. A fully charged Golf cart battery or fork lift battery will read 1300 A fully charged auto or truck battery will read 1275 A fully charge cell phone tower or solar storage battery will read 1250
You don't need acid to recharge the car battery. You may need to top it with distilled water and put the battery on the charger. You may be able to get the acid from a car battery shop, but some of the new car batteries now come as a sealed unit.
Normally, no it should be fully charged if it is a fresh battery.
No, mine is fully charged thank you
The XL's internal battery will need to be charged using the plugin charger.
It might need a new battery.