600mAH output is not the correct charging rate for the batteries they say this charger is for.

By Amazon Customer - August 10, 2017It seems to give a false charge like it only charges half of the battery

Works fine charges both my phones batterys.

but this is how mine seems to work:blue LED - plugged in, not charging anythingpurplish LED - actively

Overall I gave it one less star for the flimsy design of the prongs, the lack of clear directions and the excruciatingly slow charge.

It gets quite hot and smells weird when it's charging my battery, but it hasn't caught on fire or exploded (yet?).

it works but very slow charging

need to figure out a new plan, moy old phone have a bad charge port and some info transferred and most didn't so I need a fully charged battery to get the phone back on to farm all the info off of it.

The little movable charging pins work like a charm

One charge allows like 8 h of drawing

It is not fast charging so do not expect your battery to be done after 30 minutes, on average my battery took be about an hour and forty or 2 hours to charge steadily up to 100 percent which, again, is fine my be

Reasonable charge time.

Works well and charges fast

Charge is not very fast - much slower than plugging in the phone - but the way I use it that is not a problem

So far so good, charges Samsung Galaxy S4 batteries just fine.

Battery fit fine in the universal adjustment and charged well.

Great product and work around when your USB port charging location no longer works

It seems that the spring that holds the battery in place while charging starts to fail

The replacement universal model works fine with Samsung Galaxy S4 batteries as the spring door hold the battery against the charging pins well

When the battery is fully charged, the LED turns blue again

however it would be a solid one star as that is just a ridiculously slow charging time and is not practical for a backup charger

Fingers are crossed that SOMEHOW the slower charge translates into a longer battery life

It adjusts to any battery, and charges is just fine.

Steady charging is always healthier for your battery over fast charging.

Charges well and charges quick

It does charge well though and fairly fast!

Within a couple of hours it seems like the battery is either fully or almost fully charged

it's convenient and fast charging my extra

My only complaint is that the battery dies much faster now being charged with this charger as opposed to when I used a regular charger.

This charge works well

it works but very slow charging

The only downside is that the indicator light for mine doesn't change to blue after my battery is fully charge the only way to know its done charging is by touching the device and making sure its not hot like when its still charging.

Further the charge is super slow...

It provides a rapid, efficient charge without overcharging or overheating

Two of them worked but are agonizingly slow charging the batteries from 20% up to the 90-97% charge range and took all night or day to do it

While the bracket is clearly adjustable and very easy to insert the battery, the charging prongs (1 positive, 1 negative) also need to be "individually" moved to ensure proper connection.

I love having a spare, fully charged battery handy for my cell phone

My only complaint is that the battery dies much faster now being charged with this charger as opposed to when I used a regular charger.

It is an external charger which is the perfect answer for phones that have a damaged or loose charging port.

so when one is charging the other is working.

First day charging two Galaxy S4 batteries yesterday and this device worked great charging both of them to 100%.

Red charging light works

The side tension does not hold real well so battery stops charging.

Charge is a bit slow, but works.

I own a Samsung Galaxy 5 phone with charging port that doesn't work anymore, (a.common problem with these)

So I would recommend this charge to anyone, its awesome.

Works fine, a little slow charging

Works fine, a little slow charging

works well with my samsung batteries and works well while charging a battery and another charging on USB port.

Works great, like the adjustable charging prongs.

My husband has an old Samsung with a busted charging port

small, fast charge, can charge my old phone battery

Charge is a bit slow, but works.

I ordered this and a new S5 battery so I could have a fresh charge by the time I get home in the afternoon

After charging my battery my phone would only start up and then crash

Bought this for my drawing tablet battery since the usb port had broken and no longer charged, the charger works fine and does what it says.

Very reliable and fast charging on our Samsung Galaxy 3 Phones and spare batteries

(we can't survive without our phones these days!).I got this charger as a next day delivery, with free S and H, as a prime member, because my total order was over $35.I'll digress here for a moment:I really love my Amazon prime membership

Works as it says it should