mains - Is it safe to connect battery in series with wall adapter?

Is it safe to connect a battery in series to wall via adapter?

I have an AC adapter which gives me 10 vDC from the wall (220 volts). I've measured the adapter and it outputs 10 vDC. I have a 3 volt battery. I would like to connect in series to get 13 vDC.

1. Is this possible?


2. Is this safe? If not, what can go wrong?

Answer

You do NOT want to connect the battery in parallel with the wall adapter. The battery will most likely explode.

It sounds like what you are asking is if you could wire them in SERIES. I.E. 10V + 3V = 13V. You could do this for some simple experimentation as long as the current of your load is much less than the rating of the battery or the wall adapter. However in the long run this is to be discouraged and you should obtain the wall adapter that gives you the voltage that you need.

You could also consider buying or building a switch mode up converter that takes your 10V up to 13V.