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Old 05-27-2015, 02:03 AM #1
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Default Nitecore UM20 - Help me please

I purchased 2 18650 Panasonic 2900mAh batteries and a Nitecore UM20 charger. I put the batteries in the charger (yes, with the correct polarity) and plugged the USB into my 5v 2100mAh wall adapter. The left side shows 58% battery and flashes about 3-4 times, the right started off at 59% (continually flashes) and has risen to 70% over the last little while(I dunno about an hour I guess). It would appear the left is not charging. I swapped the batteries left to right and again the right side charges and not the left. Is this normal operation? It only charges one at a time. If so this really sucks balls.

I found my answer after extensive searching. Yes... it charges one at a time... lame

Oh and my safety glasses came in the mail today.


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Old 05-27-2015, 05:32 AM #2
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Default Re: Nitecore UM20 - Help me please

Sounds like it's not get enough power. Try one of those "super chargers" with a 2 amp output and plug that in the UM20

Last edited by doubleone44; 05-27-2015 at 05:33 AM.
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Old 05-27-2015, 02:43 PM #3
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Default Re: Nitecore UM20 - Help me please

Quote:
Originally Posted by doubleone44 View Post
Sounds like it's not get enough power. Try one of those "super chargers" with a 2 amp output and plug that in the UM20
5v 2100mAh charger...

In actuality this charger I was using is a 2xusb port charger. Info on it says it is 2100mAh. NOPE it's 2x 1050mAh...
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Laser Safety
Eye Safety First:Uvex S1933X Skyper Safety Eyewear, Black Frame, SCT-Orange UV Extreme Anti-Fog Lens
"5mw"* 405nm Gearbest Pointer - Highly Unlikely to be 5mw
5mw 445nm Custom Pointer in a former Cordless Drill "Gun Style" Host - proof of concept before going into Nerf Gun
5mw ~515nm Bladed LightSaber Osram pl515 with "Growing Blade" Video attached (Host by Ehgemus)
5mw 532nm Pointer Broken? After months of no use it works now... can't explain.
5mw 685nm from 10fenny in Pen Host - Link - Broke Driver taking it apart
Graveyard
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Two Laserlands 5mw 445nm Pens

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Last edited by Trendkilla254; 05-27-2015 at 04:33 PM.
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Old 05-28-2015, 12:17 AM #4
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Default Re: Nitecore UM20 - Help me please

If you have an ipad/android tablet charger lying around plug it into that - that *should* supply enough current to charge the batteries simultaneously. If you don't have one but know a friend with an ipad, ask if you can try their charger with your um20.

I believe iphone etc chargers won't supply enough juice to overcome the one after the other problem - most only supply up to 1A

If the tablet charger trick doesnt work, then that should prove your findings - that the um20 is a lame design that only charges one battery at a time.
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Old 05-28-2015, 12:22 AM #5
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Default Re: Nitecore UM20 - Help me please

Quote:
Originally Posted by vk2fro View Post
If you have an ipad/android tablet charger lying around plug it into that - that *should* supply enough current to charge the batteries simultaneously. If you don't have one but know a friend with an ipad, ask if you can try their charger with your um20.

If the tablet charger trick doesnt work, then that should prove your findings - that the um20 is a lame design that only charges one battery at a time.
I am honestly not sure what is going on. I did exactly as you suggested earlier today. It was charging both batteries. When the first got full (I didn't finish charging them last night as I was going to bed and fire hazard) I inserted another one that was at 59%. Checked it about 20 minutes later and it was back to single charging. Took it home, changed nothing and it's charging both. Now they are alot closer only 4% off each other. I'm beginning to wonder if it isn't balancing them.
__________________
New to Lasers? Click Here! THIS is the thread that answers all your "Where can I..." "Is this..." "How do I..."
Laser Safety
Eye Safety First:Uvex S1933X Skyper Safety Eyewear, Black Frame, SCT-Orange UV Extreme Anti-Fog Lens
"5mw"* 405nm Gearbest Pointer - Highly Unlikely to be 5mw
5mw 445nm Custom Pointer in a former Cordless Drill "Gun Style" Host - proof of concept before going into Nerf Gun
5mw ~515nm Bladed LightSaber Osram pl515 with "Growing Blade" Video attached (Host by Ehgemus)
5mw 532nm Pointer Broken? After months of no use it works now... can't explain.
5mw 685nm from 10fenny in Pen Host - Link - Broke Driver taking it apart
Graveyard
0mw 450nm Osram PL-450 RIP 11/25/2015
Two Laserlands 5mw 445nm Pens

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Old 05-28-2015, 12:25 AM #6
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Default Re: Nitecore UM20 - Help me please

Was the lower capacity battery charging first?
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All solid state PJ: 1W B(462)400mw G(520)200mw R(638) 400mw DT40W (collecting bits)
Pointers: 1.0 watt "Z-Lase" - 520 nm diode by DTR attached to segelei zmax V5 Vaporizer
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Siemens 3 mw 632nm helium neon
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