Yes, to both questions. Even batteries that charge in a few hours have a charge current that is half the amp-hour capacity. The 1000 milliamp-hour battery would be charged at a rate of 500 milliamps. Charging a 1,000 milliamp-hour battery at 1 amp or more would very certainly damage or kill it.
Also, even small currents for a long time can cause corrosion on the metal parts of the battery. Batteries should not be charged until they are completely dead. The best way to do this is with a multimeter. Check each terminal against its corresponding terminal to make sure there is no voltage between them. If one is found to be positive while the other is negative, then the battery is working and should be disposed of properly.
In conclusion, yes, high current damages batteries. Don't do it!
At 8 milliamperes, nine-volt batteries provide 400 to 500 milliampere-hours. An amp-hour is a unit of battery capacity, whereas amperes are units of electric current measurement. An ampere-hour is the amount of electric current a battery can deliver in one hour before its energy store is depleted. Therefore, 9-volt batteries can supply up to 40 amps for about 20 minutes.
Nine-volt batteries are commonly used as power sources for small electronic devices such as wristwatch alarms, remote controls, and flashlights. They also are used as start-stop vehicles need extra power when they stop for traffic signals or at red lights. The power from nine-volt batteries can start motors that drive appliances such as vacuum cleaners, lawnmowers, and refrigerators. Batteries can be connected in series or parallel to increase their voltage or decrease their load so they will last longer. For example, six 9-volt batteries can be connected in series to produce a voltage of 27 volts. That's enough power to run most household appliances without adding any more batteries. Six 9-volt batteries can also be connected in parallel to reduce their load by half. A single 12-volt battery can replace all six 9-volt batteries.
It is important to note that 9-volt batteries cannot replace a car battery! They are not designed to supply enough power for a vehicle starting system.
Therefore, nine-volt batteries can power a small appliance for approximately 1.5 to 2 hours before they need recharging.
The actual output voltage of a battery will vary depending on how much current it is supplying or receiving. For example, if a battery is used as a source of electricity, it will have lower voltage when more current is needed than when less current is required. Batteries cannot supply unlimited current because they will be damaged by too much stress over time. They also cannot supply negative voltage because that would be harmful for other components. Batteries must therefore be treated with care and not overloaded to prevent damage from occurring.
Nine-volt batteries are common in small appliances such as flashlights, remote controls, and music players. They are also used in some medical devices to avoid the need for multiple batteries of different sizes to power these devices.
Eight-volt batteries are commonly found in larger appliances like vacuum cleaners, lawn mowers, and chain saws. These batteries can supply up to one ampere for several hours before they need recharging.
A typical automobile battery, for example, may have a capacity of around 70 amp-hours when stated at a current of 3.5 amps. This suggests that this battery could give 3.5 amps of continuous power to a load for 20 hours (70 amp-hours/3.5 amps). Or, put another way, the battery could supply enough energy to light up 75 watts of equipment for 20 hours.
Batteries contain two electrodes with an electrolyte between them. When a voltage is applied across the electrodes, ions in both liquids are driven toward the negative electrode (which contains more electrons), creating a flow of current through the circuit. Batteries can be categorized by the type of electrolyte they use: acid or alkaline. Acid batteries include lead-acid, nickel-acid, and lithium-acid. Alkaline batteries include AA, AAA, D, and 9V batteries. The term "dry cell" applies to batteries that cannot be recharged; they must be replaced. Common dry cell types include Al, Zn, H, NiMH, and Pb.
The maximum output capability of any single cell depends on many factors such as material quality, manufacturing process, temperature, and state of charge & discharge. Cells are usually specified by their average current rating over time. For example, an AGM (absorbed glass mat) battery with a 10-hour average current would be suitable for applications requiring 100 milliamps or less.