GTL 18650 Battery Charger Test

old4570

Flashlight Enthusiast
Joined
Feb 15, 2009
Messages
3,001
Location
Melbourne - Australia






Ok lets get the negatives out of the way first ..
The negative battery tab that slides down to hold the battery on the right side BROKE ! , I played with it all for about one hour , and it busted .

Also those tabs are really binding badly when you try to slip in a battery , very poorly designed .

Left channel terminates at 4.10v , re-inserting the battery and it then terminates at 4.11v , re-insert on more time and it terminates at 4.13v and thats it .. The right channel [ yes the one with the now broken - tab ] terminates at a very nice 4.16v and does not re-start .

With a battery @ 3.98v I measured a charge current of 200mA , and with the battery at 4.05v I measured a charge current of 120mA . Updated3.54v = measured 310mA charge current.

On termination there is a trickle charge of 0.17mA , which is very very small .
Charge voltage appears to be 0.02v over the battery voltage .
Open circuit = 5.03v

As can be seen in the picture , I did a little motor tool work , and jerry rigged what was left of the broken tab so I could hook up a battery cradle .
For $8USD shipped , :fail: [ Products should not break - with the broken tab the charger could become dangerous ]

It could be a useful charger , could being the operative word ..
The sliding tabs need work so that they dont bind , and do they need to break ? 4.13v on the left channel and 4.16v on the right , I could live with that , I need to deplete a cell to find out what charge current the charger starts with , so will update ASAP .

Physically the charger can handle even the XTar 17000 , so at the very least its not battery challenged .
 
Last edited:
That's a shame that the negative terminal broke so quickly. Perhaps your vendor will replace it for you if you tell them about it?
 
That's a shame that the negative terminal broke so quickly. Perhaps your vendor will replace it for you if you tell them about it?

For 8USD , Im not worried about it , its worth the money just to test the charger , Ive spent more money on faulty drivers and blown LED's and I dont mind spending $8 on a public service announcement .
 

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