# Saturday, 13 March 2010

Today I went to pick up some parts to complete my Mobile Hotspot Project, first of all I decided to get a smaller sized battery since the one I had original, is big and bulky. So I wanted to get something that's smaller and easier to carry around.


So I got this, 6V 1.2AH battery. My first surprise was that while the battery capacity was about 1/4 of the big battery, it costs TWICE as much! While I was soldering the connection wire I learnt something new. I should solder the connector first, before soldering the wires to the battery. Because I soldered the wires to the battery first while I was soldering the connector... I shorted the connection with my soldering iron, sparks flew! Good lesson...

So after the smaller battery was completed and tested to be working I created the other component which I wanted to make.


A 4AA battery holder, with normal alkaline batteries these would theoretically give out 6V of power which should be more than enough to power the router. I measured the current with a multimeter and got a nice reading of 6.6V, So I went ahead and plugged it to the router. And I was happily surfing the net with AA batteries.... for about 10 minutes. Then the router started flickering on and off, a good indication of low power scenario. I unplugged the batteries and measured the power output and I got... 5.5V!?!?!?

I figured it's because that when an alkaline battery is used out the voltage gradually decreases on a slope. Unlike a rechargeable battery which is at the same voltage for most of it's usable lifespan and then drops. I guess the way is to introduce more power into the loop.

Luckily I was prepared for this scenario. While I was thinking of using AA batteries to power the setup, I was planning to use rechargeable batteries. But.. a rechargeable AA battery only has a voltage capacity of 1.25V, 4x1.25V = 5V. Cutting it a bit close so I thought of an idea, which is to make a power booster to bump up the voltage.


This battery case will be linked in series to the power source it's connected to, boosting the voltage of whatever it's connected to by 3V. Once I plugged this in I can again power the router... for a while, once again I could see a very drastic drop of power in the alkalines once hooked up to the router. It's obvious that alkalines aren't the best source of power to be used in this scenario.

I then decided to work on a power switch so I can turn power on and off when I wanted to without having to disconnect the power source to the component.


You might have noticed that each piece is more or less interchangable. This allows me to have some form of extendable system, for example I can have the router powered by 4AA batteries, as well as controlled by the power switch.


Then if needed to, I can plug in the booster pack.


Depending on the situation, I can plug in an extension wire, and then the lightweight 6V battery.


The reason I needed this extensibility was because I had a crazy idea, and it involves this thing.


A belt strap... cause I want to try and do this.


Hook everything up to it and really carry it around in a portable manner, the problem of course is that if people saw a SLAB strapped to someone, they probably would think that I'm a suicide bomber or something!

Anyone have a good idea to make a belt like this look less like a suicide belt?

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