RAVPower Luster Mini 3000mAh Portable Battery Charger/Flashlight

This is a must have!

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Add more than a full charge or 9 hours of additional talk time to your iPhone 5 / 4 / 4S / 3G / 3GS. On most other phones, benefit from 1 full charge or 94+ hours of audio playback.
•Duo purpose design: Power bank and a flashlight.
•Stylish, lipstick-shaped, lightweight design (4.17 x 0.9 x 0.9in, 2.79oz) fits easily into any pocket or bag.
•Constructed using Grade A cells and premium microchips to ensure the highest quality. Charge time: 3-4 hours via AC 0.12A adapter (not included).
•Package contents: RAVPower 3000mAh External Battery, Micro USB cable, welcome guide, 12-month hassle-free warranty.(Apple Adapters- 34 pin and Lightning, NOT Included).


Staying Mobile – Replacing Your Cell Phone Battery

There are several cell phone replacement battery choices on the market, some better than others. Here we will explore a few of the options out there.

Basically, there are four different types of cell phone battery:

o Nickel Cadmium Batteries (NiCd): These are the oldest type of cell phone battery. To counter the problem of “memory effect” which lessens the life of the battery, they must be fully discharged before being recharged. This is obviously more time consuming and lessens the efficiency of the cell phone.

o Nickel Metal Hydride Batteries (NiMH): Developed in the 1990s. These batteries are more efficient than the NiCd type. Although prone to some memory effect, they are quicker to recharge than the NiCd and have a battery life up to twice as long.

o Lithium Ion Batteries (Li-Ion): Lithium Ion Batteries are the most popular cell phone batteries today. They are lighter than the NiMH, do not suffer from memory effect and have a 30% longer life.

o Lithium Polymer Battery (Li-Poly): This is the newest cell phone battery technology on the market. Li-Poly batteries enable the most compact of cell phones and their lifespan is more than twice that of Lithium Ion batteries.

It is important that the battery you choose is compatible with your cell phone. This should always be the one recommended by the cell phone’s manufacturer and is the best way to ensure that both battery and phone are operating at their optimum performance level.

There have, unfortunately, been incidents where cell phones exploded and caused injury due to overheating and poor quality batteries. Many inferior quality batteries are, in fact, fraudulent copies of brand name cell phone batteries.

Companies such as Nokia, Samsung and Motorola are among the many brands that these cheap cell phone batteries have sought to copy.

Nokia, in its 2003 article entitled “Battery Safety – Issues and Prevention” discusses the growing market in fraudulent batteries. It notes thirty to forty battery explosions reported by Nokia customers. In each of these cases, the battery involved was found to be a non-original battery or fraudulent copy of a Nokia cell phone battery.

Nokia goes on to inform the reader of some signs to look out for when buying a replacement cell phone battery. Look at the label. Is it crooked? Are any words misspelled? Are the words: “Made in China” on the label? If the answer to any of these questions is “yes” the battery is almost certainly a forgery.

The safest way to purchase a replacement cell phone battery is to do so through the manufacturer or an authorised dealer. To do otherwise is to put yourself and, indeed, anyone else who may have access to your cell phone, at the mercy of an inferior battery with possibly dangerous consequences.

So, the time has come for your faithful Communications Assistant to get a new lease of life – or at least a replacement cell phone battery.

To keep the lines of communication open, choose wisely.


Mobile phone battery charger with Auto-Cut Off

Please contact us for more information:
Ph: +91 9490219339 (WhatsApp/SMS text only Please)
Hyderabad, India.

Students will be provided with complete working hardware kit and other related documentation.

We develop customised projects as per your requirements.

We are specialised in developing IoT based industrial projects usinng various sensor like Temperature, Humidity, light, water level, moisture, pressure, fire, flame sensor, air pollution, gas sensors like MQ-02,MQ-03,MQ-06 etc. Alcohol sensrs, LPG gas, LDR sensor, current CT sensor, voltage sensor for solar panels, IR (infrared) sensors, Laser light sensors, Magnetic sensors like hall effect, read switch etc, tilt sensor, sound sensor, heart rate sensor, blood pressure sensor, body temperature sensor, rain water sensor, ultrasonic distance sensor, Thermisters, PIR sensor, MEMS accelerometer sensor, Digital compass, positional sensor, Direction sensors, RTC, EEPROM, iButton reader, piezo sensors, wireless power, Load cell, weight sensors, flex sensors, Flow sensors, Resistive touch screen, APR voice module, Eye blink sensor, DHT11, LM35, Speech recognition, mp3 player, Barcode reader, color sensor, Capacitive touch sensor, energy meter, Matrix keypad, SD card reader, Tachometer (speed sensor), Nextion displays, Fuel sensors, Vibration sensor, LiFi.

Motors we work with:
DC Motor, PMDC motors, Servo Motor, AC Motor, Series motor, Universal motors, stepper motors, geared motors, brush less motors.

We work with following communication devices.
GSM Modem, GPS Receiver, IoT esp8266, RFID readers (Active and Passive), Zigbee, Bluetooth receivers, WiFi transceivers, RS232 communication, RS485, CAN communication, RF Transceiver, RF 433MHz, PLCC (Power line Carrier Communication), barcode reader, finger print reader, smart card reader, USB communication, PS2 communication, DTMF, Ethernet communication,

We work with PIC Microcontrollers (8bit, 16bit, 32 bit), MSP430, PIC 12F, PIC16F, PIC18F, PIC24F, PIC32F series, STM32, Arduino (Pro mini, Nano, Uno etc), AVR, ATMEGA, esp8266, 8051, 80S52, ARM, LPC2148, Raspberry Pi, Orange Pi(Lite,One,Plus etc), Nodemcu, Wemo etc.

WE develop following Hardware(sensors) accessing mechanisms:
Android apps, PC based applications, Web development with IoT, TCP sockets, UDP, http, remote file systems and data loggers.

Domains we work with:
Security, SCADA, wireless, protection, data loggers, control systems, telecommunications, education, transport, agricultural, industrial, building autommation, home automation, access control, IoT with Android apps, solar, non-conventional power generation, medical, Robotics, advertisement displays (scrolling led sign board, P10 displays, 50-50 led sign board, pixel programmable led sign board,

Displays we work with:
Nokia 5110, Propeller display, 16×2 LCD displays, 20×4 displays, scrolling led displays, 128×64 graphical displays, oled (spi,i2c), TFT displays, seven segment displays,

Power electronics and Switching devices:
MOSFET, Transistor, Power Transistor, IGBT, SCR, TRIAC, Relays etc.

We also develop IEEE projects like IEEE-2016, IEEE-2017 Student projects along with modifications.

Mobile phone battery charger with Auto-Cut Off

The intelligent device which performs the task is a Microcontroller. The charging unit is interfaced to Microcontroller. The microcontroller continuously monitors the charging parameters and controls the charging circuit accordingly. The microcontroller is capable of measuring battery voltage and turns OFF the charging automatically, if the battery has reached its limit. The system also alerts through buzzer alarm system when the battery charging reaches its limit. To perform this task microcontroller is loaded with an intelligent program written using embedded ‘C’ language.

The major building blocks of this project are:

1. Regulated Power Supply
2. Micro Controller.
3. Charging unit.
4. Mobile battery.
5. LCD with driver.
6. Buzzer with driver.
7. Reset.
8. Crystal oscillator
9. LED indicators.


What’s inside a Tesco Power Hit disposable phone charger.

Well, this is a bit of an ecologic disaster. It’s another singe-use product that seems to contain a fully rechargeable lithium cell.
I can understand why they did it, since lithium ion cells have a very high energy density and are cheap to mass produce, but it still seems a terrible thing to make a disposable item that could be reused 1000 times if it had been designed around a standard power bank chip and fitted with a recharge socket.

On a plus note, for people like us it’s a handy source of a decent capacity lithium cell for a low price on the high street. Note that this cell will be a typical low current cell and is not recommended for use in a high current drain application like a drone.

I have recharged the cell in one of these units completely without incident and believe them to be standard rechargeable cells, but as it’s not specifically sold as being rechargeable the usual precautions should be taken when experimenting with lithium cells. the cell is bare and would require external overcharge protection.

It’s interesting to note that the original manufacturer of these (Hopepower) also does a dual connector version that suits both Apple and Android devices, and does a very similar rechargeable version.

If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-


Upgrade your phone charger to charge the 12v battery, generate 13 5v, 14 2v on the mobile charger

How to use a 12v battery charger charger, generating 13.5v, 14.2v power on the mobile charger. Homemade rechargeable battery aa, battery charger 12v simple, compact, convenient (diy)
Channel: Alfred


Excellent & Simple Battery Charger (Gel/Lead Acid/Li-Ion/+ more)

This circuit has been in use for 24 hours a day over the past 4-6 months. It operates perfectly. I used this circuit to charge two 18650 Li-Ion batteries for my cordless vacuum cleaner. You can charge many different battery types with this circuit. If you charge (2) Li-Ion batteries in series as I did, be sure to affix a 3A/ 70-90 degree Celsius thermal fuse between both batteries using thermal heatsink compound and foil tape. The fuse will then be wired in series with the 2 batteries. Also set charger output voltage to 8.33V – 8.36V, and use a 1 ohm resistor in the circuit.

Schematic here:


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Cellular Phone Repair

Cell phones have become a necessity for many people throughout the world. In such a scenario, life seems to come at a halt if there is a fault in your cellular phone and you need a repair.

Until recently, only the manufacturers undertook the cellular phone repair job. Opportunities now exist for entrepreneurial individuals to start their own lucrative business, either as an employee of a cellular phone repair shop, or having their own stand-alone cellular phone repair operation.

Some basic steps may be followed if your cell phone is not working properly. First, determine if the problem is with the phone or the battery by replacing the battery. If you can’t hear callers, make sure the volume is turned up, the ringer turned on, or the battery is charged. If these strategies don’t work, take your cell phone to a cellular phone repair center.

Nowadays, customers may bring in a faulty phone to any of the cellular phone repair centers. A Work Order Form will be issued, and a deposit towards the cellular phone repair service must be made. An agreement is then signed for receiving a courtesy phone. All cellular phones have a one-year manufacturer’s warranty. The cellular phone repair centers will repair or replace phones under warranty as long as the user did not cause any physical damage to the phone. If the warranty has expired, the cellular phone repair center might charge for repairs. Once the cellular phone repair job is over and the phone is returned by the relevant cellular phone repair center, the customer returns the courtesy phone, makes the final payment and receives the repaired unit. Sometimes it’s best to just purchase a new phone, because cellular phone repair costs can be as high as the cost of a new phone.

A cellular phone repair technician has several sophisticated tools and techniques available for the repair job, such as:

Cleaners – They are used in cellular phone repair since they are oxide dissolving contact cleaners. These equipments are used to clean dirty pins in the phone and thus aid in cellular phone repair.

Lamps – They are used while doing a cellular phone repair job to protect your eyes when you work. Table lamps come with high-frequency 4200Hz lamp without frequent sparking to avoid harmful effect to eyes, since a lot of work under deficient light at normal 50Hz/60Hz can cause short eyesight and many eye diseases. It is a very useful tool for people who are doing the cellular phone repair business.

Phone Open Tools – A cellular phone repair job requires opening up of cellular phones. Several tools such as screwdrivers made of magnetic alloy steel can be used for this part of the job.

Programmers – Cellular phone repair requires the cellular phone to be unlocked. Not all mobile phones can be unlocked with simple cable. Programming tools can be the only way to repair “death phones”, those that have stopped working. A 24xxx chip reader can read and write EEPROM (Electrically Erasable Programmable Read Only Memory) in a phone without any problem. Power obtained from USB connection to computer port, serial port is used for reading/writing data during a cellular phone repair job. Programming tools are used in almost every cellular phone repair center.

Ultrasonic Cleaner – It is a device that transfers ultrasonic sound waves to a cleaning liquid or solvent that dislodges embedded dirt on objects immersed in it. The ultrasonic cleaner is used during cellular phone repair to clear the PCB board of cellular phones.

If your phone becomes faulty, don’t panic. Just take the basic steps that have been highlighted above. If this does not work out, you can still take your phone to a cellular phone repair center where a cellular phone repair technician can solve your problem.


How To Make an Universal Cell Phone Battery Charger DIY | RoyTecTips

Build you own External Cell Phone Battery Charger Under $1. You can charge any mobile phone’s removable batteries. This trick really help you if your mobile phone is not charging but everything else is working fine. Remove the battery and charge it.

Here I used a Li-ION charging circuit model number TP4056.
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Digipower TC-U400 Universal Battery Charger Review

A universal battery charger that will charge lithium ion batteries of different shapes and sizes for cameras, phones and other electronic devices. It will also do Ni-CD and Ni-NH AA/AAA.


DigiPower TC-U400 Universal Li-ion Battery Charger

Other chargers:


Phone Charger For Car: A Mobile Solution for Mobile Devices


The dual USB car charger is a great example of how a product has been developed as a response to meet the needs of those who use portable electronic cell phones and tablets. Portable is the operative word in this instance and these devices share some common features. For the purposes of this article, the most important common feature is that they all require charging. They require a charging solution that is as mobile as the devices themselves so that full functionality at any given time is always available. A dead device is of no use to their users.

The Cell Phone Car Charger

The underlying assumption with this charger is that cell phone users also use a car. In the majority of cases, this is exactly what happens and the vehicle can be your personal use vehicle or a company vehicle that you use during the course of a typical work day. The phone charger for car is small enough that you can keep it handy in a pocket so that you can use it in multiple vehicles as required. Of course, it is suitable to be used in multiple vehicles without the possibility of causing damage to the vehicle’s electrical system so it has universal usability.

The Best Dual USB Car Charger

It is the best because it is a quality product and does exactly what it is supposed to do. It also does it fast, to the point where you can safely charge two devices together without sacrificing charge speed. If you are travelling with someone else, you can charge their cell phone as well, while you are charging yours. The system of using universal ports will also make it possible to charge cell phones with different operating systems, such as an iPhone or an android phone, simultaneously. These are just a few things that set it aside from other chargers.


The dual USB car charger provides a flexible charging solution that is perfectly matched with the underlying concept of portable electronic devices. Cell phones and tablets require constant charging, regardless of whether or not you use them for business or pleasure. A phone charger for car complements the mobile environment by offering a mobile, in-car charging solution. It will ensure your devices are charged quickly so they are always ready to be used without the need to stress over a dead battery. It truly is a mobile solution for mobile devices.