When calculating the life of a battery it will be necessary to know the number of charge cycles that can be performed until the battery does not begin to lose its capacity.
Depending on the type of battery these charging cycles can vary, the most common being the mobile batteries, manufactured Li-Ion or Li-Po, which have a duration of between 300 and 500 charging cycles according to model and manufacturer.
Once thisE limit we will notice how the battery loses duration of operation, arriving to lose up to 25% of its capacity of load.
At this point it will be necessary to evaluate a battery change.
It should be noted that usage and charging habits can significantly affect battery life. For example, factors such as heat, charge the battery several times a day without it is almost exhausted, etc. Will be affectedits duration.
Therefore, to get the most out of the battery we must know when a full charge cycle is performed, and try to avoid misuse of charge, to increase its useful life.
A charging cycle is considered when the battery has been discharged or its 100% charge has been used.
The manufacturers advise that the charge is never made below the 58% battery, since the battery voltage would not fall so lowTo, so you could end up winning up to 4000 charge cycles.
Tips to increase the life of a battery.

• Avoid extreme heat or cold or very long applications of the device.
• Charge the battery as often as you can.
• Fully discharge the battery from time to time.
• Do not let the battery run out completely before charging.

Below is a table with theDifferent voltages (V), charge cycles (C) and battery percentage (B).

Depending on the need for installation and type of base, trolley or chair, we can find various types of fixation. Among the most common we find:

A - Through hole: It has a hole in which a screw or stem is inserted. It is a very simple installation system. Ideal for wheels that should not support a lot of load.
B - Threaded stem: It has a threaded stem or nut, it is fixed to the surface with a nut. It is usually the most used fastening system.
C - Angular plate: They are usually less used fastening systems, they have lateral plates to fix on the base.
D - Plate: It has a rectangular or square plate on its surface, it includes 4 or more fastening holes to the base, it is one of the most common.
E - Smooth stem: The stem without thread is inserted into the female of the base, we can find it in the typical office chairs with wheels, TV furniture etc ...

The Trendelenburg is a position in which a patient lies down with the head lower than the feet. This position is used in surgery and intensive care to improve blood circulation to the brain and abdominal organs.

For example, it is used for patients who are undergoing surgery in the pelvic or abdominal area, as it helps reduce the amount of bleeding during surgery.

The Trendelenburg position is achieved by placing a board under the bottom of the patient's bed so that the head is lower than the feet. The inclination is usually around 20-30 degrees. This position can help improve blood flow to the brain, as gravity helps increase pressure in the veins of the neck, which in turn helps increase venous return.

Additionally, in patients with heart failure, the Trendelenburg position may help improve blood flow to the heart and abdominal organs, which may be beneficial for organ oxygenation and cardiovascular function.

However, this position is not suitable for all patients, in some cases it can cause problems such as decreased blood flow to the heart, decreased pulmonary oxygenation, or even intraocular or ocular pressure. Therefore, it is necessary to evaluate each particular case and the needs of the patient before making the decision to use the Trendelenburg position.

Reverse Trendelenburg is a position in which a patient lies with their head higher than their feet. This position is used in some cases to improve blood circulation in the abdominal organs, especially in patients with heart failure problems. In the reverse Trendelenburg position, gravity helps increase pressure in the abdominal veins, which in turn helps increase venous return and improve circulation to the abdominal organs. This position can also be used in patients with respiratory failure, as it can help alleviate symptoms and improve organ oxygenation. However, it is important to bear in mind that this position is not suitable for all patients, and it can cause problems such as decreased blood flow to the brain, decreased pulmonary oxygenation, or even intracranial pressure, therefore it is necessary to evaluate each particular case. and the needs of the patient before making the decision to use the reverse Trendelenburg position.