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Dr. Matthew Guariglia, a senior policy analyst at the Electronic Frontier Foundation, said that some cities have very strict rules about when and how police can use drones, while other cities in the country have no regulations.

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The Wheat Ridge Police Department said since they brought drones to their department in April, they have been able to use them to respond to different 911 calls almost every day.

"This is a big concern because right now courts are very divided on, for instance, whether or not a police department can fly a drone over your house or over your property with or without a warrant," Guariglia said.

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Wheat Ridge police said their drones also help with investigating car crashes and monitoring large crowds like at festivals.

Wheat Ridge police say they had to check with their district attorney before flying drones, and that they are one of at least 20 departments in Colorado using them.

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Alex Rose, the police department's public information officer, said they are excited about their drone’s capabilities, which include helping keep officers safe.

The police department said one of their drones recently caught somebody breaking into an apartment. In June, a maintenance worker called their department, saying they saw some intruders inside an apartment. Instead of sending an officer, they sent a drone.

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After obtaining a warrant, the drone went inside the home to investigate. Rose said the drone found a dog and a person sleeping in a closet. The person was arrested, and the investigation is ongoing, police said.

Sgt. John Bowman, the drone course director for Wheat Ridge police, said the department's drones also have Zoom features.

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Wheat Ridge police say they train some of their officers on how to use drone technology. (Wheat Ridge Police Department)

The Principle Of Lithium-ion Battery Charging Lithium-ion batteries rely on lithium ions moving between positive and negative electrodes. During the charging and discharging process, Li+ is embedded and de-embedded back and forth between the two electrodes: When charging, Li+ is de-embedded from the positive electrode, and embedded into the negative electrode through the electrolyte, which is in a lithium-rich state; The opposite is true when discharging. Lithium-ion battery charging principle The working principle of lithium-ion battery means its charging and discharging principle. When charging the battery, lithium ions are generated at the positive electrode of the battery, and the generated lithium ions move through the electrolyte to the negative electrode. The carbon as the negative electrode is in the form of a layer structure, which has many micro-pores, and the lithium ions that reach the negative electrode are embedded in the micro-pores of the carbon layer, and the more lithium ions are embedded, the higher the charging capacity. By the same token, when the battery is discharged (i.e., the process we use the battery), the lithium ions embedded in the carbon layer of the negative electrode come out and move back to the positive electrode. The more lithium ions that return to the positive electrode, the higher the discharge capacity. What we usually call the battery capacity refers to the discharge capacity. Lithium-ion batteries generally require the charging process to be controlled in four stages: trickle charge (low voltage pre-charge), constant current charge, constant voltage charge, and charge termination. When there is no charge management chip pens to the lithium-ion battery on the power charge, the lithium-ion battery in the case of low power, the jolt into the high current, will lead to damage to the lithium-ion battery, because the current is high, the heat is also fast, the battery life will become shorter. The basic requirement for charging lithium-ion batteries is a specific charging current and charging voltage, thus ensuring safe battery charging. Lithium-ion battery charging method is limited voltage constant current, are controlled by IC chip. What is the charging current of lithium-ion batteries? Lithium-ion batteries generally accept a maximum charge current of 1C or less, and laptop batteries have a maximum charge rate of 0.9C. The so-called 1C charging rate refers to the capacity of 1 times the current to charge, charging time of 1 hour. In fact, for a long battery life, it takes 10 to 4 hours to charge at 0.1 to 0.3C. The national standard stipulates that the charging current of a lithium-ion battery is 02.C-1C, and the charging current of a 100AH battery can be in 20A-100A. That is to say, the capacity of the 1500mAh battery, if charged with 0.2c, the charging current is 0.2¡Á1500=300mA, charging for 5 hours. Lithium iron phosphate batteries can generally use a charge and discharge current of 1C or higher (15C), so they are more suitable for power lithium batteries. General lithium-ion battery charging current is set between 0.2C and 1C, the greater the current, the faster the charge, and the greater the battery heating. Moreover, too much current can't charge to full capacity, because the electrochemical reactions inside the battery take time.

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When they decide to send a drone to an area, officers are able to use a GPS tracking system to see where the drone is launched from, and a live picture of where the drone is flying.

Rose said the department is pushing the limits of what their drones are capable of. He said a team of around 10 officers are trained on how to use the drones.

Lithium-ion batteries rely on lithium ions moving between positive and negative electrodes. During the charging and discharging process, Li+ is embedded and de-embedded back and forth between the two electrodes: When charging, Li+ is de-embedded from the positive electrode, and embedded into the negative electrode through the electrolyte, which is in a lithium-rich state; The opposite is true when discharging.

"It is new technology, and so we are constantly looking at what are other departments doing. Is there any case law that is concerning this and other jurisdictions," Rose said.

"It takes a lot of practice. A lot of patience. A lot of repetition. But these camera systems and these operating systems cover lots of different areas," Bowman said.