Hey everyone-I took a Tank case and installed a voltmeter. It also holds a Peak Eiger and an extra 10440. I’m not sure how much I’ll use it like this but I think it’s neat. I think it would be a great gift idea. Let me know if you have a questions about it. Enjoy!
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That’s a very ingenious idea, I like it! Thanks for posting, and welcome to BLF! :party:
Thanks man!
There’s room in there for a TP4056 charger board too…
Thanks CRX! I’m new to this and actually didn’t know those things existed. I have one on the way!
Yeah they’re really useful mini chargers that you can change the charge current on by swapping out a resistor, which is advised for charging 10440 cells
HKJ Review
Thanks for the info. I read HKJ’s review and it’s a bit over my head. But I see that replacing the resistor with a 4.726 kohm one as it reduces the mah to 210 which I think is safe for a 10440. Do you know where I could get one of these? I looked around on the web but haven’t been able to find a clear/easy way to order one. Should I be searching for one with an SMD code of 512 (from the chart you included in your reply)?
Thanks man
You might want to come down to about 130mA charge current if you’re using Trustfire/Ultrafire 10440’s so a 10k, 103 resistor should do for that. I would recommend Efest 10440 cells instead - about the best available at the moment
This set of resistors should cover your needs
http://www.fasttech.com/products/1002/10000028/1005200
And some other value sets
http://www.fasttech.com/products/0/10000028/1005400-0805-150-36k-smd-resistors-value-pack-280-piece
http://www.fasttech.com/products/0/10000028/1005300-0805-62k-910k-smd-resistors-value-pack-270-piece
Solder paste will make the job a lot easier to do
http://www.fasttech.com/products/0/10003546/1261003-chips-repair-tool-soldering-paste-grease
What a cool little set up. 
You can replace the resistor on pin 2 of the IC (the RProg resistor)
Either strip the SMD resistor off and solder leaded thru hole resistor to the pads (looks really gaudy but works) or replace it with another SMD resistor.
I have replaced some for a fellow member here, I would be willing to solder a resistor to your boards if you like…I say putting a 5K resistor on there would be good enough…it doesn’t have to be exact…I put 2.2K on mine and get ~500mA on my charge boards
Either way, very ingenious carry case mod…gotta love those little 3.6” volt displays
Be advised they will drain down a battery pretty quickly…I had one permanently tied into a single cell portable power unit…it would drain the battery from full charge (approx 4.18vdc) to display turnoff (around 3vdc) in about a week [this is why I soldered in a small 6mm momentary push button, so I could check the voltage w/o having it drain the battery]
mtnelectronics has several charge rates to choose from
Awesome. I’m about to order the 10k set. Thank you so much for that info. I happen to have a set of efests. I haven’t used them for more than a few seconds at a time as I don’t know much about them (I got them by mistake). Are they safe (enough) for lights that can handle the ICRs?? I read that they aren’t recommended in the peak eiger with the xl optic. I have one in stainless steel and it’s my little baby 
http://www.em-mgt.com/LED/Eigerultrax.html.
Also, you mentioned using 130ma. Are trust/ultrafires a risk with more current? The reason I ask is the I am using an Xtar MCO
that charges at 250 and 500mah for those blue batts. I use the 250 setting.
Thanks!
Thanks for all the info. I would like to try to build the charger myself but if I have a question I’ll give you shout. Thank you for the offer! That momentary push button sounds really cool. Let me know where you picked it up!
I’ve found that the blue Trustfires are the better of the cheaper 10440 cells but they only have about 260mAh max capacity and cook quite easily. A higher charge rate is fine but degrades them faster. 250 or 500 is ok.
Good to know. I’ll let you know how the charger works out. Thanks for all of your help!