A very simple method to get double output voltage within the space of a single AA battery. Useful for strengthen your single battery powered device, eg. flash light, nose hair trimer and etc.

Step 1: reason

Sometimes you are not satisfy with the POWER of your single battery powered device, such as your dim tiny flash light, tooth polisher or the MOST common used nose hair trimmer.

For me, I have changed a lot of them but they are all slow even when I use a NEW battery.

Each time I used them I sweared to put TWO batteries inside it someday.
An idea instead of destroying a 9v battery that you can add in series all day long are watch batteries? I found that a large enough plastic straw and right size batteries to fit snug in it and now you are making not taking apart. Play around with different sizes. Just remember that series adds voltage 1.5 += 3.0 and parallel stays same voltage but last longer current.
You could possibly break the seals (or the battery casing itself) on the batteries doing this, causing leakage and ruining your devices.
doesn't everyone realize you could just get some 14500 batteries? up to 4.2V in a rechargeable&nbsp;AA size thing. No hacking needed.<br />
in the uk the batteries inside a duracell 9v are red,even though tey look the same on the outside.
y not put the batterys in parralel so u still have the 1.5 volts and u have longer living batterys in the end and put it in an old battery after taking everything out of it.
Okay this entire comment and all the replies are retarded. Those small batteries in the 9 volt battery are like 800mAh. Putting them in parallel will give you a 1600mAh battery @ 1.5 volts. WOW! YOURE WORSE OFF THAN WHEN YOU STARTED
Because he wants it to be more powerful not longer lasting, so he puts 2 1.5v batts to double the power (3v). Get it?
yes but if u blow up the torch not my proplom. and if u use it in parralel u can get longer lasting and brighter for longer... am i not correct..????
Yes you could put the batteries in parallel but thats not the point of this ible, he wants more power not longer lasting... And you could blow out the bulb but its not going to "Blow up"... i thought you were talking about the trimmer :P btw its problem not proplom...
Very nice instructable. Not that I'm not a fan of hacking things up, but I did want to point out another alternative if anyone's interested in going the 'double voltage' route. Lots of battery websites like <a rel="nofollow" href="http://www.all-battery.com/aasizenimhrechargeablebatteries.aspx">all-battery.com</a> offer rechargeable Ni-MH batteries at 1/3 and 2/3 the size of a standard AA. A combination of the two would produce one AA-size battery rated at ~2.4v. This can come in handy for those tight spaces where you'd want to increase the voltage! Again, great instructable!<br/>
thanks for your info! special battery for flashlight is very POWERFUL too!
Awesome project - As for 'the best trimming experience'...just wait till that little sucker grabs your sinuses and rips them out your head :D Good job!
Your not actually doubling anything, that's kind of annoying.
He's doubling the voltage out put to the motor. 2X the rpm at the sacrifice of some run time and a little lower max amperage. I may try this as my trimmers lack a little speed Those "babies" are AAAA batteries. I have a pen light that takes them. this is where I source my batteries for it as AAAA's are about as expensive as AAA's if not more.
I meant he's not actually "doubling the voltage of an AA battery" he's just using more batteries, that aren't AA's.
Damn it. I lost the contest. You won... :-(

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