12.6V battery pack, 3xcell phones battery pack. HELP!

[Sirius9]

Just to confirm, there is a protection PCB in those phone cells.

[luminarium_iaculator]

Thanks guys...

This is good to know for all of us because we can make our own battery packs out of quality smartphone cells.

[WarHawk-AVG]

Cell phone batteries = protected

Flat pack Li Ion w/o the board = non protected

Way too much liability to not have battery protection on cell phones

dani_cj great post!

[breinrules]

<p>Another tip, if the connectors have 4 leads, it surely</p><p>is protected. Not sure about that 3 leads though, must be for grnd.</p><p>Most if not all phone batteries have 4 leads. The other 2 leads must</p><p>be for internal clock?&nbsp;</p>

[luminarium_iaculator]

@breinrules

Another tip, if the connectors have 4 leads, it surely is protected. Not sure about that 3 leads though, must be for grnd. Most if not all phone batteries have 4 leads. The other 2 leads must be for internal clock?

Another nice tip.. Will try to build out my own soon. Just need to buy input/output connectors for 12V charger.

[bibihang]

Hmm… I have a 55W HID spotlight that running off a build in 12V SLA battery. Does anyone think that I can hook up battery pack like this in series and replace the bulky SLA battery? I know running lithium batteries in series is a less recommended way to go with but since they have protection circuits I guess it should be okay?

[pinkpanda3310 (Pinky)]

But can they handle 4-5 amp draw? If the cells can handle it, I don’t think the pcb can.

[dchomak]

@bibihang

Hmm… I have a 55W HID spotlight that running off a build in 12V SLA battery. Does anyone think that I can hook up battery pack like this in series and replace the bulky SLA battery? I know running lithium batteries in series is a less recommended way to go with but since they have protection circuits I guess it should be okay?

IMHO, the best solution for big lights are the drill battery packs. They already have a BMS on board and they can quick charged. They are built out of IMR’s and can really supply high current levels. Here is a big light I built using an 18V pack.

42 Emitter Flashlight mod. UPDATE, Now running on 18V and FINISHED

Done the easy way. I’m starting with one of these, most everyone knows about them. [image] Back probably 10 years ago they were about the brightest light one could get in the mainstream retail channels. I remember my local Sams Club had them on clearance one day and I bought a bunch because the price was very low, something like $10 or so. I remember their regular price was about $30. What I didn’t know at the time is that the 12V rechargable battery that ran them, which was included, was of …

Here is another that I will try to run on a 12v pack, although it may not quite work out.

Started my XHP-70 flashlight - EDIT: complete redo

The redo is finished except for the driver. I have had these ideas for some time now and I finally got a started on building my first XHP-70 light. From reading about the other mods and builds here, it seems to me that the most difficult part of building one of these is coming up with a way to power the LED. The XHP-70 can be configured to run on 6V or 12V, I am choosing 12V 6V. Ideally I suppose, running a 6V configuration with a 2S configuration and a driver is ideal. 2S hosts are common and …

[bibihang]

Thanks for the advice guys. The drill battery packs do look like a good solution.

[luminarium_iaculator]

@pinkpanda3310

But can they handle 4-5 amp draw? If the cells can handle it, I don’t think the pcb can.

This is interesting question... If we put 3 phone cells in parallel(6000 mah in small package) could this be used for 4-5A 7135/7138 nanjg driver?

[bibihang]

@dchomak

IMHO, the best solution for big lights are the drill battery packs.

Can you help me to see if the below battery packs can be used in my 55W HID spotlight?

1. 19.2V, 3Ah, Nimh battery pack
2. 12V, 2Ah, Lithium batteries
3. 12V, 9.8Ah, Lithium battery pack. (but 1A to 2A of discharge current only ?)

Thank you very much.

[dchomak]

All of those that you linked to are clones of the originals. I would expect them to perform very poorly. IMHO not worth considering.

I am sorry, I am just noticing that you are in Malaysia. Here in the U.S., I have access to the recycle bins and can find loads of tool packs, some of them in like new condition.

[bibihang]

@dchomak

I am sorry, I am just noticing that you are in Malaysia. Here in the U.S., I have access to the recycle bins and can find loads of tool packs, some of them in like new condition.

Yes, it is not really easy to have access to these electronic parts in my country, especially in where I live. This is why I need to search them online and probably from some China sources…

[pinkpanda3310 (Pinky)]

@luminarium iaculator

This is interesting question… If we put 3 phone cells in parallel(6000 mah in small package) could this be used for 4-5A 7135/7138 nanjg driver?

Sounds a lot more plausible than drawing 4-5amp in series.

[luminarium_iaculator]

Yes. 3 batteries in series (2000 mah) would work very short period of time in high power flashlight. No sense in doing that.

Parallel should be different story. 6000 mah should be good for longer runtimes... Phone cells comes in small package.

So for amc 7135 drivers we would need 2 x female dc adapter and one male dc adapter. 1x Female out should be on flashlight which would be used for battery pack male dc adapter, and other on battery pack which would be used for charging of batteries.

There are lot of fast chargers on the market for that mission (1-2A).

I have also been thinking about this types of host below... My goal is to make hunting flashlight with picatinny rail attachment driven with smallest possible battery pack. So in this type of host I could shorten main flashlight tube, solder picatinny rail clamp, fit shorter battery pack inside, and of course change head with quality aspheric flashlight(lets say newest uniquefires). And final product should be 500kcd light in short package with acceptable runtime because we no longer depend on quality of single 18650 battery because we could have even better 3x3000 mah phone batteries in parallel inside for total of 9000 mah.

[bibihang]

What would possibly be the problem if we use this one?

[ImA4Wheelr]

That might be a bit high voltage for you 55w HID ballast. I have a couple typical cheap 55 watters. They run fine on 3S 18650's and even better on 4S. Haven't dared go beyond that though.

[pinkpanda3310 (Pinky)]

That rc pack is a 6s pack with no low voltage protection. It you have space for it you can get low voltage alarms that plug into the balance tap ( or main leads ).Radio Control Planes, Drones, Cars, FPV, Quadcopters and more - Hobbyking_123085_Batteries_Accessories-Battery_Voltage_Indicators.html

[bibihang]

I think the ballast has input voltage rated at 12-24V, need to check again. This is why I think 22.2V should be fine?

ImA4Wheelr, do you use protected battery carrier like below for your 55W spotlights?

pinkpanda3310, thanks for the link. Is the low voltage alarm connected in series with the batterypack?

Thanks for the input guys.

[pinkpanda3310 (Pinky)]

Fully charged 6s is 25.2v of course voltage sag may save the ballast from popping.