Router Battery Backup

[wingnut771]

Uhh I have no idea what that is

Some devices have a positive pin in the middle, some have a negative pin in the middle. There is a graphic on the device telling you.

 

[wingnut771]

as wingnut said or a voltage difference normally they will accept a bit higher than specified without popping
sure most are designed with a safety margin how big is like the piece of string who knows

Yeah, what voltage is the ont?

 

[wingnut771]

Imagine trying to figure this one out:

 

[leon.davibe]

Imagine trying to figure this one out:
View attachment 1703567

yea thats is where a tester that shows negative comes in handy

 

[wingnut771]

yea thats is where a tester that shows negative comes in handy

What are you testing? Which way causes smoke?

 

[Bundu]

all the devices that I've seen have always had + on centre pin

 

[PsyWulf]

all the devices that I've seen have always had + on centre pin

It only takes one

 

[leon.davibe]

What are you testing? Which way causes smoke?

The psu they are a pair afterall

 

[wingnut771]

The psu they are a pair afterall

You don't have the psu, all you have is this:

 

[leon.davibe]

You don't have the psu, all you have is this:
View attachment 1703709

if that is all you have and you don't want to gamble you either look for forum posts of others or open the device

and post those online, specialists in electronics will likely be able to deduce from components which is which i would think

if you encounter a device with dubious markings like this checking before it fails may be a good idea
but yea who of us thinks of doing that with new devices

 

[Steamy Tom]

You don't have the psu, all you have is this:
View attachment 1703709

As far as I know it is more common for the left symbol to be there outer and the right the inner. So if I had to absolute guess I would say the outer is positive. But I would just open it and see.

 

[Steamy Tom]

As far as I know it is more common for the left symbol to be there outer and the right the inner. So if I had to absolute guess I would say the outer is positive. But I would just open it and see.

You don't have the psu, all you have is this:
View attachment 1703709

So now that I am at a PC I searched for this, and it seems it was a question on some forum, its from an amp and it is indeed the outer positive, inner negative. Apparently also the inner is directly connected to an internal battery negative.

 

[Park@82]

Imagine trying to figure this one out:
View attachment 1703567

Is that on a router? What make/model?

 

[dabbler]

Is that on a router? What make/model?

Methinks that's a photoshop.

 

[Steamy Tom]

Is that on a router? What make/model?

Amazon.com

I do not understand this polarity symbol with 3 circles: positive, round, negative, and no lines

I am trying to figure out what is the right polarity of a power adapter for a small practice amplifier. I know it is 9 VDC and I figured out the size of the plug and I know the wattage needed. I do...

electronics.stackexchange.com

I think he got it here

 

[wingnut771]

Is that on a router? What make/model?

Just a pic I found on google.

 

[Rickster]

My Gizzu 60W 56Wh 17600mAh Mini POE DC UPS, seems to to cooked.

Bought in 2023/03/04, seems to only last 1 hour now with 2x 12v @1.5A devices.

I'm sure these are 18650 lithium based, how can they be dead already?

From new it did last 4 hours precisely, long 4+ hour outages did drain them to 0% maybe 10 times since purchase date. Anyone have the same issue?

 

[Willie Trombone]

I'm sure these are 18650 lithium based, how can they be dead already?

Probably bad battery management - letting it drop too low. Looks good on paper for a year while it works since it keeps you up longer, but yeh... after warranty it's not their problem.

 

[Willie Trombone]

if that is all you have and you don't want to gamble you either look for forum posts of others or open the device

and post those online, specialists in electronics will likely be able to deduce from components which is which i would think

if you encounter a device with dubious markings like this checking before it fails may be a good idea
but yea who of us thinks of doing that with new devices

You'll easily find -
At some point it goes to ground in the circuit so testing continuity with it open should work.

 

[Longboi]

My Gizzu 60W 56Wh 17600mAh Mini POE DC UPS, seems to to cooked.

Bought in 2023/03/04, seems to only last 1 hour now with 2x 12v @1.5A devices.

I'm sure these are 18650 lithium based, how can they be dead already?

From new it did last 4 hours precisely, long 4+ hour outages did drain them to 0% maybe 10 times since purchase date. Anyone have the same issue?

This.