DIY Flashlight Power Bank

30 posts / 0 new
Last post
zelee
zelee's picture
Offline
Last seen: 6 days 18 hours ago
Joined: 06/04/2013 - 06:53
Posts: 1968
Location: S.E.A
DIY Flashlight Power Bank

Hi guys
anyone interested with this light

if i use 3.7v 3400 mAh battery i wonder how much current from the battery will i get when try to charge a cellphone since the cellphone need 5 volt to charge.
anyone knows?

dave_
Offline
Last seen: 7 months 4 weeks ago
Joined: 04/19/2013 - 08:45
Posts: 457
Location: Schleswig-Holstein, Germany

Well, the product description says:“Output: 5.3V (1% Error), 800mA “, so I guess 800mA it is.

zelee
zelee's picture
Offline
Last seen: 6 days 18 hours ago
Joined: 06/04/2013 - 06:53
Posts: 1968
Location: S.E.A

darn it.
actually i need the one that can supply at least 1A :~
since my phone is really power hog

StyXSIS
StyXSIS's picture
Offline
Last seen: 6 years 2 months ago
Joined: 07/01/2013 - 01:01
Posts: 209
Location: Manchester UK

zelee wrote:
darn it.
actually i need the one that can supply at least 1A :~
since my phone is really power hog

Not really, all the 1A is for is a completely flat batt charge. The 800mah will work if the batt still has charge, just turn the phone off for half hour to charge, that’s so the phones batt gets more of the input charge. It will charge a phone but it will struggle to fully charge if you leave a phone on to charge.

Simon

bgyen
Offline
Last seen: 1 year 9 months ago
Joined: 03/02/2013 - 10:34
Posts: 633
Location: Canada

Are you interested in more flashlight or more power bank aspects; or more of a compact design?

There’s this thread with some more suggestions.

I kind of like the JinHeng – I don’t own one, but it’s on my wishlist.

Chloe
Chloe's picture
Offline
Last seen: 5 years 2 months ago
Joined: 01/30/2013 - 14:14
Posts: 4595
Location: 联合王国

Interesting to see a kit available. ^^

zelee
zelee's picture
Offline
Last seen: 6 days 18 hours ago
Joined: 06/04/2013 - 06:53
Posts: 1968
Location: S.E.A

@StyXSIS
thanks for the info Smile

@bgyen
i prefer this light
because side switch and tail cap

to bad the price is a little bit high though Silly

StyXSIS
StyXSIS's picture
Offline
Last seen: 6 years 2 months ago
Joined: 07/01/2013 - 01:01
Posts: 209
Location: Manchester UK

I’ve been looking around at quite afew so called “power bank” chargers since i read this thread and replied, and i have to say that this
3* 18650 batteries with 2* USBs to Charge different Mobile Devices with an XM-L2 emiter and Side-Switch
is the one i’ve bought after reading alot, simply because it can charge 1 singular, or 2, or 3 batts or all at once balance charge 3 of them. The left usb port can give out alternating amps to charge an iphone or ipad which need 1A and 2A to charge. And the fact it can do that probably means alot of other things can either be charged or even powered by this FL (Maybe?, I’ll have to test that theory out when i get it).

Simon

StyXSIS
StyXSIS's picture
Offline
Last seen: 6 years 2 months ago
Joined: 07/01/2013 - 01:01
Posts: 209
Location: Manchester UK

LOL, i was posting what i bought as you were replying.

Simon

zelee
zelee's picture
Offline
Last seen: 6 days 18 hours ago
Joined: 06/04/2013 - 06:53
Posts: 1968
Location: S.E.A
:bigsmile:

KD sell cheaper than IOS
USB Flashlight
maybe we should start a group buy Wink

StyXSIS
StyXSIS's picture
Offline
Last seen: 6 years 2 months ago
Joined: 07/01/2013 - 01:01
Posts: 209
Location: Manchester UK

Awwww bugger, that is quite abit cheaper by $15, well nevermind. I’ve bought afew other things from them before anyway and had them fedex’d and they usually get here in less than 2 weeks, so i’m ok with the price.

Simon

zelee
zelee's picture
Offline
Last seen: 6 days 18 hours ago
Joined: 06/04/2013 - 06:53
Posts: 1968
Location: S.E.A

@StyXSIS

can’t wait for your impression about this light Smile
depend on that maybe i’ll take one too

DayLighter
DayLighter's picture
Offline
Last seen: 4 years 5 months ago
Joined: 11/29/2012 - 01:22
Posts: 2829
Location: New York City

wow.. the different is XML2 and XML U2 is $15 ?!? Silly

The only way to do a great work is to love what you do.

devman
Offline
Last seen: 4 months 2 weeks ago
Joined: 04/27/2011 - 06:24
Posts: 825
Location: Hong Kong / Vancouver, Canada

zelee wrote:
:bigsmile:

KD sell cheaper than IOS
USB Flashlight
maybe we should start a group buy Wink

Nice. Comments on the page say that it’s back ordered though, so I guess I’m going to be waiting a while.

photon1k
photon1k's picture
Offline
Last seen: 4 years 6 months ago
Joined: 02/11/2011 - 23:29
Posts: 901
Location: Lotus Land, Canada

zelee wrote:
Hi guys
anyone interested with this light

if i use 3.7v 3400 mAh battery i wonder how much current from the battery will i get when try to charge a cellphone since the cellphone need 5 volt to charge.
anyone knows?
I think there must be better ways to charge your phone, and certainly better flashlights for $14. Seriously, if you want an emergency power source for your phone it’s easier to carry a USB cable and 1 watt PS than the light you linked. If the power goes out for any non-trivial length of time a single 18650 is not going to help your phone significantly given the horrible efficiency of one battery charging another. OTOH if you’re just looking for a cute little kit to put together, than have at it! :bigsmile:
fartybum
Offline
Last seen: 6 years 11 months ago
Joined: 08/17/2012 - 19:29
Posts: 348
Location: UK

zelee wrote:
if i use 3.7v 3400 mAh battery i wonder how much current from the battery will i get when try to charge a cellphone since the cellphone need 5 volt to charge.
anyone knows?

By current I think you mean Voltage.

From your link – Output: 5.3V (1% Error), 800mA

zelee
zelee's picture
Offline
Last seen: 6 days 18 hours ago
Joined: 06/04/2013 - 06:53
Posts: 1968
Location: S.E.A

@photon1k
i have 4 ×18650 PS and that is too big for me to carry around Flat Stare

@fartybum
yeah sorry i just want to make sure about is that really 800mA or not,because i need at least 1A Smile

photon1k
photon1k's picture
Offline
Last seen: 4 years 6 months ago
Joined: 02/11/2011 - 23:29
Posts: 901
Location: Lotus Land, Canada

zelee wrote:
@photon1k
i have 4 ×18650 PS and that is too big for me to carry around Flat Stare
Yeah, I wouldn’t want to carry that either. That’s why I suggested a USB cable and a 1W wall wart, unless you spend a lot of time off the grid. But even then you could power the charger from your car.
zelee
zelee's picture
Offline
Last seen: 6 days 18 hours ago
Joined: 06/04/2013 - 06:53
Posts: 1968
Location: S.E.A

working night shift sometimes i don’t have much time to charge my phone so i need a small but enough current power bank to charge my phone 2 or 3 times ,android phone really power hog even at minimum setting Silly

margamanos
Offline
Last seen: 1 week 5 hours ago
Joined: 09/03/2012 - 17:40
Posts: 128
Location: MACEDONIA, Greece
DayLighter wrote:
wow.. the different is XML2 and XML U2 is $15 ?!? Silly

i cant find a way to choose different led on kaidomain. On the other site its clearly that you have options:

  • Cool White – XM-L2 U2 1C
  • Neutral White – XM-L2 T4 5B1 (80CRI Min.)
  • Neutral White – XM-L2 T6 3A ( +$1.99 )

is it available at kaidomain on 40$ with neutral white?

zelee
zelee's picture
Offline
Last seen: 6 days 18 hours ago
Joined: 06/04/2013 - 06:53
Posts: 1968
Location: S.E.A
margamanos wrote:
DayLighter wrote:
wow.. the different is XML2 and XML U2 is $15 ?!? Silly

i cant find a way to choose different led on kaidomain. On the other site its clearly that you have options:

  • Cool White – XM-L2 U2 1C
  • Neutral White – XM-L2 T4 5B1 (80CRI Min.)
  • Neutral White – XM-L2 T6 3A ( +$1.99 )

is it available at kaidomain on 40$ with neutral white?


maybe if you order at least 100 pcs they will consider adding NW tint :bigsmile:
margamanos
Offline
Last seen: 1 week 5 hours ago
Joined: 09/03/2012 - 17:40
Posts: 128
Location: MACEDONIA, Greece
zelee wrote:
maybe if you order at least 100 pcs they will consider adding NW tint :bigsmile:

After serious consideration ..i will pass Silly

I bought a couple of power banks in the past and both of them broke down.
If your selfphone has a micro usb input you can travel and have this (1…. 2….) as a charger. You will only need to charge the torch by night and use the wire to charge your phone during day from the flashlight. it is a good option actually

photon1k
photon1k's picture
Offline
Last seen: 4 years 6 months ago
Joined: 02/11/2011 - 23:29
Posts: 901
Location: Lotus Land, Canada

zelee wrote:
working night shift sometimes i don’t have much time to charge my phone so i need a small but enough current power bank to charge my phone 2 or 3 times ,android phone really power hog even at minimum setting Silly

My android phone was the same way when I first got it. There are several apps on the play store to monitor and control battery use. I don’t recall which ones helped me – I had to experiment, but I did manage to reduce battery consumption by about 40%. I think it varys a bit between phones because of different versions of android and apps that you’re running.
Werner
Werner's picture
Offline
Last seen: 2 years 3 weeks ago
Joined: 10/19/2012 - 15:00
Posts: 3679
Location: Germany

Thanks for posting this, I have been looking for a modeable charger/flashlight for days…
Sadly the star makes almost no contact to the tube, I will order one and check what can be improved.

zelee
zelee's picture
Offline
Last seen: 6 days 18 hours ago
Joined: 06/04/2013 - 06:53
Posts: 1968
Location: S.E.A

thanks werner
as you said the star isn’t making contact to the tube,maybe you can add a brass in there?

Werner
Werner's picture
Offline
Last seen: 2 years 3 weeks ago
Joined: 10/19/2012 - 15:00
Posts: 3679
Location: Germany

We will see how much room there is.
Another important point is the driver and his current and if it is improvable.
I guess it will take 3 weeks until it arrives.

I am not sure what you mean with the 1A thing?
My phone has a wall charger which is stated 1A but it charges only 0.8A max and like said above with rising battery% the current decreases…
But my phone don’t charge with full current on all setups, it only enables high current charging if the datalines are shorted which can be made easily on this DIY kit.

Important is the battery capacity:
2500mAh*0.8 efficiency/1.6Ahphonecapacity=1.25. So I will be able to recharge about 125% of my phone…

TheGloriousTachikoma
Offline
Last seen: 5 years 8 months ago
Joined: 08/22/2013 - 09:23
Posts: 946
Location: Ann Arbor, MI

Anyone kinda concerned that the directions direct the buyer to solder wires to the battery ?

Werner
Werner's picture
Offline
Last seen: 2 years 3 weeks ago
Joined: 10/19/2012 - 15:00
Posts: 3679
Location: Germany

I see no problem in soldering wires to a battery…
Scaru reported once with a similiar one cell power bank from fasttech that the circuit shorted the battery and this caused heating the connection wire(he ripped it into pieces to prevent further problems), but KD gives even a hint to use better insulating material.

What I am wondering is if the battery comes with the kit, and if one is included if it is a Samsung like on the pictures, one picture shows a battery with a spot welded piece of metal on them…these questions will be all answered in some weeks…

And I am wondering what we see on this picture?

Werner
Werner's picture
Offline
Last seen: 2 years 3 weeks ago
Joined: 10/19/2012 - 15:00
Posts: 3679
Location: Germany

Today my kit came, look at the “battery” must be one of the new iron cells…?

Werner
Werner's picture
Offline
Last seen: 2 years 3 weeks ago
Joined: 10/19/2012 - 15:00
Posts: 3679
Location: Germany

Charges my phone with 0.45-0.8A depending on battery voltage, discharge protection at 2.5V. After the device goes in protection it can only be activated with plugging in a charging cable. Datalines have a 1.9kohm resistance. Maximum current from battery was 1.4A.
One short press enables the USB output(indicates by blue LED), long press enables the led light.
Led current less than 350mA so no heatsink necessary.
Cables are 22AWG.
All in all quite nice.

……………….
I have to test the 18650 charging circuit and make a picture to show the dimensions next to some other one 18650 lights.

Space for driver is available so I think I have to figure out how to mod it.
.
.
.
Edit:
I got an answer from KD, there is no battery in the kit and they have no clue how the bearings came in the envelope…
I modded it with a xml2, used the original driver with a modification of the resistor to get around 1.5A through the led. Easy mod very nice host.
http://budgetlightforum.com/node/25687#comment-486135