Li-ion Rechargeable Batteries 9V

Nine-volt batteries power many types of portable electronic devices and are often found in radios and clocks. Rechargeable batteries provide an alternative to disposable batteries, and rechargeable lithium-ion batteries combine high power density with low memory effect.

What is an NiMH or Li-ion battery?

Battery types are named after the chemical reactions that take place inside of them. For example, NiMH stands for nickel-metal hydride, while Li-ion stands for Lithium-ion.

Lithium is a chemical element that stores and releases electric charges in the cells of batteries. Lithium-ion batteries, sometimes called lithium cells, come in disposable and rechargeable versions. Lithium-ion batteries have high energy density and low self-discharge.

What is charge capacity?

For lithium-ion, NiMH, and other types of rechargeable batteries, battery charge capacity is measured in mAh, or milliamp-hours. Charge equals current multiplied by time and measures how long battery cells provide power.

For example, an electronic device may demand one milliamp of current from its batteries. Every hour, the device depletes the battery cells by 100 mAh. A lithium ion battery with 600 mAh of charge capacity would last six hours.

How do you recharge lithium-ion batteries?

Rechargeable lithium-ion batteries can be recharged by simply placing the batteries in the charger at any time during the discharge cycle. Rechargeable lithium-ion batteries have a very low memory effect, meaning that they retain their original maximum capacity even when inserted into the charger without being fully discharged.

Charging time for rechargeable batteries is dependent on the charger. Chargers designed for lithium rechargeable batteries will shut off automatically when full charge is reached. Always verify that your charger is compatible with the type of your rechargeable batteries.

What is battery cell capacity?

For nine-volt lithium-ion and other types of rechargeable batteries, such as NiMH batteries, battery cell capacity is rated by how much current the battery discharges and for how long, while staying above the rated voltage of the battery. A volt is a measure of electrical pressure in a circuit. For a lithium cell battery rated at nine volts, the capacity measures how much of the capacity can be discharged before the voltage drops below nine volts.

Can lithium batteries lose charge when electronics are off?

Even with electronics turned off, NiMH and lithium batteries can slowly lose charge. For Li-ion batteries, this effect is due to chemical reactions involving the lithium within the battery and is called self-discharge or shelf life. Typically when not used, lithium-ion batteries will lose 2% to 3% of charge per month.