# Electrical Wiring in the Home/electronic wiring help

Question
So I have 2 cellphone chargers that output 5 volts at 2 amps.  I want to combine them so that I can get more amps if any. How and what do I use to wire them so that it will charge my phone.

Frank,   I take it both the 2 mp chargers are made to charge that phone,    and most likely you bought another thinking the first was not doing the charge correctly        Am I close?

Here is the problem,   first you could put the two charger outputs in parallel,    in other words  one plug in would be in the phone,   then the second pair of wires,   you would keep your polarity right   tap into the first and now you would in theory have 4 amps,

Instead of me writing all the electrical theory out,  here is link explaining it all

http://batterytender.com/includes/languages/english/resources/Connecting_Batteri

But I am concerned we have a problem here that is not current,

Also  chargers even rated exactly alike        will not charge exactly alike,  and one will sense it is done before the other,,  then  now we have a tapped in parallel connection but one of the chargers is likely to try and back feed into the other,  and they have all kinds of different circuitry in chargers,     none are the same,

If your OEM original charger is not charging your phone,   it is likely that the problem is not the amount of current

If you watch an amp meter on a battery charger        when you first start it     it might put out 20 amps   depending on the battery, conditions,  so on,   and as the battery becomes charged the amps drop off,

So you would be charging at two different rates      again even with exact chargers,      they are just not made with that close of tolerance,

If your one charger is not charging at all       then it could be the battery is bad,  has developed a memory  and only charges to a certain point,  much lower than the original capacity,

Normally the best way to charge a battery is slow,  and constant, and repeated in the same manner,

You might want to read through this

In the phone itself,  there are all kinds of detectors [for lack of a better word]  that measure the incoming voltage, current, temperature, rate of charge, amount of trash in the DC signal,   [trash is basically  AC that is not filtered out by a rectifier device,     so if you looked at the charge signal on a scope you would see AC   "RIPPLES"  in the signal,

Too much trash and some devices shut off the charging incoming,       or if the phone detects any other issue the engineering was concerned with.

The battery itself also has overload, voltage and other protection circuits or a chip imbedded in the battery,     too much initial current could turn off the charging system in the phone and maybe even the battery,

Bottom line,  the charger designed for the cell phone should charge the phone at a reasonable rate of time, and at the matched specs it was designed for,

In theory  I see where you want to go,   and on a simple electrical circuit   not a problem,   but it gets way complicated when you get into cell phones and cell phone batteries with micro charging circuits,

You didn't say why you wanted more amps,     are these chargers not designed for your phone?

At the prices they charge for cell phones,  I would be very careful to not plug anything into the phone that is not what the phone was designed for,  it is not a simple OHMS law kind of thing,

more of interest

AND finally   a complete link to battery charging technology

http://www.analog.com/static/imported-files/tutorials/ptmsect5.pdf

I see where you want to go,  I just don't know all the particulars,  if you have no charger an are wanting to make one,  or one is not fast enough,    or doesn't charge completely,

The whats and whys are important,     if you had one charger and it just did not do the job I would say you have a worn out battery,  bad charging circuit in the battery, in the phone, or both,

But if you are just trying to get to 4 amps,   because the phone data states four amps,  how those four amps are delivered vary greatly from charger to charger and phone to phone,

Unless you have schematic of the phone circuit and know all the specifics,   the amps is just one tolerance of the phone,  and a rough on at that,

Charging batteries the wrong way, can cause all kinds of problems from overloads to fire, to a blown up \$700 phone,

In theory I am not saying it is impossible, but unlikely

I would suggest an OEM charger from the manufacturer,    and a battery from the manufacturer,     or a known generic charger that warrants it will charge a list of phones and yours is on that list,       there are generics out there for specific phones,      and all in one storage cells you can precharge,   and use as needed,

But if you are attempting to make a four amp charger out of two    2 amp chargers,   just too many complications and dangers to be fooling with,

If you want to give me the phone specs, and th4e charger specs, I will dig into it for you, but my guess is we will find that the two chargers in parallel will fight each other,   and without a complex way to balance the charge  plus blocking any back emf to either charger,   and to make sure we don't immediately overcharge the battery and blohw it out of the phone,

I would get with the manufacture and get the correct charger   and if there are problems from there,   let them correct the issue,

So I would Not  NOT    simply wire the outputs in parallel and plug it in,      that would be how it would be done physically   but with the circuity we have no idea about in the phone or the battery,    I would not chance it,

A much safer way would be to find a regulator and use batteries as a charger     that way no rectification,    and then charge the   "charging batteries"  by using rechargable batteries as your charger,

Above is an interesting generic charger,  and it shows all the whoops you have to go through to find the right connections on the battery, the configurations and so on,

I think something like that would be a much better choice,  as connecting two chargers blind is likely to have a ton of bad issues,     right in theory,  if you were dealing with a simple battery sitting on a bench,  but this is a whole different ballgame

Let me know how you get along,    but again my suggestion is to go with the OEM CHARGER     and not chance damaging your phone or a fire, or many other issues,  based only on AMPS
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Electrical Wiring in the Home

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