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What is trickle charging? Do lithium batteries require trickle charging? Trickle charging refers to the small current charging of a lithium battery after it is fully charged, which can keep electrons flowing and extend their service life. The efficiency of trickle charging is too low, usually done at the last 5%, which often takes several hours to charge.

What is trickle charging?

Trickle charging is used to compensate for the capacity loss caused by self discharge of a battery after being fully charged. Pulse current charging is generally used to achieve the above objectives. To compensate for self discharge and maintain the battery in a continuous low current charging state that is approximately fully charged. Also known as maintenance charging. The batteries of DC power systems in telecommunications devices, signal systems, etc. are often in a trickle charging state after being fully charged, in preparation for use during discharge.

The entire process of charging a mobile lithium battery includes three stages: fast charging, continuous charging, and trickle charging. In theory, trickle charging refers to a charging method with a charging rate that is high enough to fully charge the battery and low enough to avoid overcharging. Maintaining charging is also a way to describe trickle charging. Many battery manufacturers advise against long-term use of trickle charging.

If trickle charging is used, the charging rate will be very low and sometimes intermittent. The best smart charger can only perform temporary charging rate changes when charging the battery. They do not have continuous low-speed charging function. Some battery dealers say that if long-term trickle charging is carried out, only one tenth of the battery's energy will not be harmed. However, we have not seen any manufacturers conducting such tests yet.

Do lithium batteries require trickle charging?

Generally speaking, with the release of electricity and the decrease in voltage during use, the chemical activity of lithium batteries will also decrease. From the perspective of protecting the lifespan of lithium batteries, the charging of conventional lithium batteries generally goes through four stages: trickle charging (low-voltage pre charging), constant current charging, constant voltage charging, and charging termination.

Trickle charging is used to pre charge (restorative charging) fully discharged lithium battery units. When the battery voltage is below about 3V, trickle charging is used. The trickle charging current is one tenth of the constant charging current, which is 0.1c (taking a constant charging current of 1A as an example, the trickle charging current is 100mA).

Lithium battery charging method

Firstly, when charging for the first time, it should be consistent with normal charging and does not require special treatment. Charging can last for eight to twelve hours.

Secondly, it is necessary to use a dedicated charger provided by the lithium battery manufacturer for charging. When charging, connect the output port of the charger to the battery first, and then connect the charger to the power supply.

Thirdly, due to the lack of memory effect in lithium batteries, they can be charged as needed, which is beneficial for the battery's lifespan. It is recommended to charge them for eight to twelve hours each time, and the longest time should not exceed one day.

Fourthly, when not in use for a long time, it is necessary to charge the lithium battery for two hours every two months, otherwise it will cause a decrease in battery performance. In addition, it is advisable not to charge the battery after it has been fully discharged. It is best to charge it when in use, and to charge it lightly.

For lithium batteries, the charging method has a significant impact on their performance. A reasonable charging method can extend the lifespan of lithium batteries and improve charging efficiency.

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