Refueling on the go - mobile USB charging

Almost all modern gadgets can be charged from a computer’s USB port or charged with such a port.
The fashion for compact devices has led to the fact that the batteries in them are not too capacious. For example, my HTC HD2 barely lasts a working day with heavy use, and even less in GPS navigator mode. As a result, you have to run from charging to charging or carry spare batteries with each device. But a set of different batteries will cost a lot and replacing the battery on a walk is about 5 minutes: turn it off, change the battery, turn it on, start the soft-ware, wait until it finds the satellites again. Unpleasant.

I will show how to do USB charging, which you can take with you. " RMPS "
RMPS

It allows you to charge through a standard USB port everything that eats no more than 3A, and itself is powered by a constant voltage of about 7.2V to 22V. (model aircraft, car batteries, everything at hand).
The cost price is about 280-300 rubles. Production time is approximately 1 hour. Size is a bit larger than the AA battery.

How to use

Any DC voltage source with an XT60 connector (yellow) or JST mini (red) is connected to one connector.
We connect any device that can be charged from it to the USB connector and that’s it, charging has begun. In this case, you can use the phone or what we charge there without interrupting the charge.
View from the side of the connectors and a regular AA battery next to compare size: “ RMPS
RMPS


How to do

We take TURNIGY 3A UBEC w / Noise Reduction ($ 4.42 per HK), solder an additional XT60 connector to the input (Input) (or others, depending on the power sources that you have, I made 2 types of batteries that I have) . We solder the USB connector to the output, connecting the middle 2 pins shortly, so that the device thinks that it is charging from the power supply and does not limit the charging current to 500 mA. Solder to the number 1 pin "+", to the pin number 4 "-" (view from the side of the connector, solder from the back, of course)


The cost of the connectors is about 50 rubles in total.
The wires are neatly folded, fastened with electrical tape, hot glue or hidden in a heat shrink tube. Done!
Compact lithium-ion batteries from radio-controlled models easily fit in your pocket. Large ones that can be put in the pocket of a backpack will allow you to fully charge the device’s battery more than once. “ Charging from RMPS ” When connected to the battery, the red LED on the charging is lit, indicating that it is operational. As you can see, charging and a compact battery easily fit in your pocket, and at the right time the kit will not leave you unable to call or find your way home. Or it will provide an opportunity for several days to go to places where there are no sockets. If you wish, you can make USB A adapters - the “device port” for everything that you have and do not bring a cord with you, including the charger directly to the device. I prefer ordinary lace. UPD
RMPS Charging







Especially for lovers of AA batteries: “ RPMS & AA ” We buy any batteries or batteries in a kiosk and recharge from them if you wish. As I mentioned above - the device is not picky about the power source.
RPMS & AA


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