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# 6V DC to 12V DC.

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#### pkshima

##### Member
hey guys.

i need a 12V ~2Ah battery solution for my project.
i cudnt figure out any such battery in the shop.
not in a small size at least.

however there r small and cheap batteries that r
available but they r 6V 4.5Ah.

so guys the question is how do i convert this 6V into 12V.
i need a clean and compact way.

All you need to do is wire two 6v 2Ah batteries in series. Result, 12v 2Ah.

lol nice one pebe. :lol:

but if u read correctly i said i want a battery small in physical dimensions.
connecting two batteries in series(or even parallel for that matter) also doubles the size and weight. :roll:

also :lol: how wud connecting two 6V 4.5Ah batteries in series result in 12V 2Ah

well, you dont seem to understand the "capacity " of a battery mesured in Ah. it reffers to how much energy a battery can store in. a battery that has a cpapacity of 1Ah can supply a current of 1A for a time of 1h.
that means that if you have a 6v battery with 4.5 Ah it has an energy stored in of 4.5A x h x 6V=27Wh(V x A = W)
so if you connect 2 6v/ 4.5Ah in series you willl get an equivalent battery of 12v/4.5Ah, that compared to 12v/2Ah means that it will just last longer and you have more energy avaliable to the circuit, nothing else.

thats what i was saying that connecting the batteries in series will give a battery of 4.5 Ah capacity not of 2Ah

step up trans

just make like a really simple inverter.....with a 555 timer or just a couple of transistors and capacitors... make it like 10k Hz, amplify it with whatever you have...a couple power transistors or mosfets and run it through a transformer. depending upon the current you are going to draw you could just order one up. the only thing is that the transformer will take up some space.

but i dont get what your problem is in having a 4.5Ah battery instead of a 2Ah.
you just have more energy, that's all. you can use your robot for more time.

oh i understand now.

i dont have any problems in 4.5Ah battery. its the voltage thats the problem. i need 12V and the battery is 6V.

i.e. i was looking for something like u told me elswhere. a switching power
supply. i searched the shops and they dont know of any such thing.

i was just expecting someone to give ideas on doing that easily.

pkshima said:
lol nice one pebe. :lol:

but if u read correctly i said i want a battery small in physical dimensions.
connecting two batteries in series(or even parallel for that matter) also doubles the size and weight. :roll:

also :lol: how wud connecting two 6V 4.5Ah batteries in series result in 12V 2Ah

Of course connecting two 6v batteries in series will increase the size and weight - but not necessarily by much more than a 12v battery of the same capacity. But do you have to use 4.5Ah?

6v batteries are made in various capacities by companies like Yuasa, and should be readily available at most reputable stockists. Part numbers are:

NP1.2-6 1.2Ah
NP2.8-6 2.8Ah
NP4-6 4Ah
NP7-7 7Ah

to name just a few.

This approach would be simpler than doing a voltage doubler.

But then again, there is no shortage of comparible 12v units.

yeah i dont need 4.5 Ah.
i guess 2Ah wud b an overkill already. was just saying what i saw in the shop.

and thx for the part numbers. i will look further in other shops.
something keeps telling me that there IS a 12V battery of a small size
waiting somewhere for me just like a girl is

bye,
Shima

pkshima said:
yeah i dont need 4.5 Ah.
i guess 2Ah wud b an overkill already. was just saying what i saw in the shop.

and thx for the part numbers. i will look further in other shops.
something keeps telling me that there IS a 12V battery of a small size
waiting somewhere for me just like a girl is

bye,
Shima
With all the domestic intruder alarms needing backup batteries there must be hundreds of sources. Try one of these. They are from the Maplin (UK) catalogue.

Yuasa:
12v 2.1Ah W=176mm, D=34mm, H=66mm, Weight=830g
12v 2Ah W=150mm, D=20mm, H=90mm, Weight=700g

hmm. cool.

i would though prefer something like this one ...

https://www.batterymart.com/battery.mv?p=SLA-12V1-3

the dimesions r just marvelous nd looks too.

what do u say.
but the problem is it not availble at my local shops.
maybe i will have to search a better city.

else if all fails i will ask my brother in US to send this one itself to me.

pkshima said:
hmm. cool.

i would though prefer something like this one ...

https://www.batterymart.com/battery.mv?p=SLA-12V1-3

the dimesions r just marvelous nd looks too.

what do u say.
but the problem is it not availble at my local shops.
maybe i will have to search a better city.

else if all fails i will ask my brother in US to send this one itself to me.
If you can afford to go below your original 2Ah then the smallest leadacid I can see is the 12v 800mA (NP0.8-12) made by Yuasa.

As an alternative have you considered NiMh batteries? My digital camera uses AA 1.7Ah cells. Ten of these would do the trick and may be more readily available where you live.

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