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## How to protect battery from over-discharging?

Schematic of battery discharge circuit. The circuit discharges a battery at a rate determined by the value of Rd (ignoring LED current) such that A NiCd or NiMH battery has a nominal cell voltage about 1.2 V at mid-charge and about 1.0 V at end-of-charge. It is important not to discharge past this voltage in as it may cause damage to the battery. The

## What is the voltage at which the battery disconnects from the load?

• From the above practical observations, it is can be analyzed that the practical voltage at which the battery disconnects from the load is 6.27 V. Therefore the battery will cut off when the battery voltage of each Li-ion battery is at 3.15 V approximately.

## What happens to a battery when the terminal voltage drops?

• As the battery is attached to an electronics device and it starts discharging, its terminal voltage starts dropping. The percentage or level of charging of a battery is therefore estimated by its terminal voltage. If the terminal voltage of a battery goes below a lower threshold limit, the battery starts dying prematurely.

## Why do batteries die so quickly?

• If the terminal voltage of a battery goes below a lower threshold limit, the battery starts dying prematurely. This degrades the recharge capability of the battery as well as its efficiency.

## How to protect battery from over-discharging?How to protect battery from over-discharging?

This degrades the recharge capability of the battery as well as its efficiency. Therefore, there should be a protection circuit which can monitor the level of charging of the battery by detecting the terminal voltage and protect the battery from over-discharging by cutting off the battery connection with the electronics device.

## What is the voltage at which the battery disconnects from the load?What is the voltage at which the battery disconnects from the load?

From the above practical observations, it is can be analyzed that the practical voltage at which the battery disconnects from the load is 6.27 V. Therefore the battery will cut off when the battery voltage of each Li-ion battery is at 3.15 V approximately.

## What happens to a battery when the terminal voltage drops?What happens to a battery when the terminal voltage drops?

As the battery is attached to an electronics device and it starts discharging, its terminal voltage starts dropping. The percentage or level of charging of a battery is therefore estimated by its terminal voltage. If the terminal voltage of a battery goes below a lower threshold limit, the battery starts dying prematurely.

## Why do batteries die so quickly?Why do batteries die so quickly?

If the terminal voltage of a battery goes below a lower threshold limit, the battery starts dying prematurely. This degrades the recharge capability of the battery as well as its efficiency.

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