And 7 is still hungry, i guess?

Yes

And I blew up my charger capacitor after this comment bruh

you said that in a weird way, didnt you?

yes, you are correct. the complete reason is because a 7S battery pack has a maximum voltage of 29.4V and I want to adjust the voltage (with the secondary potentiometer on the boost converter) between 27.5V and 30V. with a 7S battery pack I could not have done that.

hi. the soldering gun is not home made. it's a powerful Romanian made soldering gun from the '80s and '90s. it's not made anymore.

that's why I got the cells with nickel strips already attached. they can be soldered much easier and faster and the cells will not heat up.

That's safe btw

I added the parts list in the video description. these are the cells: s.click.aliexpress.com/e/_Aq8Rnl

yes it's good.

hi. I like the T-shirt too, but I don't know what it says. maybe someone from Greece can tell us.

no

Good point - I was going to say that he didn't have an 8S plastic base and covers. Thinking about it, a 8S with a current driver would be a better idea.

not exactly, but you are close.

no, sorry :)

the capacity is measured in Ah, if you connect the cells in series, the current and capacity remains the same, only the voltage is added. so your 5S battery pack with maximum 21V has a capacity of 2200mAh (2.2Ah). the energy of the battery pack is = capacity*nominal voltage = 2.2Ah*3.6V*5cells= 39.6Wh.

@@Sorin_DIY thanks Bro

I'm working on it

no

hi. you can watch my part 3 video about the UPS built, I test a few ideas to switch faster on battery power.

@@Sorin_DIY ok. I will check that...thank you.🔥

@@Sorin_DIY i just watched part-3 video, so i should make relay to Klick faster and use high capacity capacitors to smooth the output when switching.

yes

@@Sorin_DIY ok ! thanks bro

it will be ready in a few days

yes

yes, you are correct.

correct

no. you can find the answer in the part 2 video.

@@Sorin_DIY Oh, yes. It's a Step-UP-only converter. Makes sense. 😃

you can find on emag some of the components I use in my videos, but not all of them. so I can't use components only from emag.

ok

that's not good. you need a 1K pot.

no, sorry :)

the 10k potentiometer will set the voltage between 12-35V, so you need to be very careful and adjust the potentiometer only about 2mm to dim the LED. if you add a 1k potentiometer you will have more control to safely dim the LED.

@@Sorin_DIY So if you put a resistor of 10k In the middle leg of power 2, does it solve?

yes, but it will be difficult to adjust the voltage for the LED.

@@Sorin_DIY I only have a 10k potentiometer and I have two resistors how do I install?

I have one of those battery-powered welders. Quite adequate for occasional use, and fits in a tool bag. I use it at work to change out cells in Chromebooks.

it will take one or 2 more weeks to finish the video.

@@Sorin_DIY ok

no

@@Sorin_DIY 😢

am i wrong?

no. there is another reason :)

it will be available soon.

i.imgur.com/n7872fV.jpg

@@Sorin_DIY Brother i dont have 1k Pot, i have 10k pot what to do?

we have a total of 5 cats divided at 2 households.

no

no

I think it will last little bit more than 30 mins. I think it is betwwen 35-50mins

​@@moya9450 With a little research, 35-45 minutes would be its run time.

hi. according to the seller this type of li-ion cell has a nominal voltage of 3.6V, this gives the battery pack an energy of 64.8Wh (3Ah*3.6V*6). in the video I mentioned by mistake that it has 75.6Wh... ups :). but in reality I think that the cells have a nominal voltage of 3.7V, not 3.6V. so the energy should be as you said 66.6Wh. I say this because the flashlight lasts 52 minutes at the highest intensity. it may sound ridiculous, but I timed it twice. the LED doesn't use 100W, that's the maximum rated power, but it's recommended to power it with less, especially because the LED is not perfect, as you see in the beginning of the video, the LED chips don't light evenly at low voltage. that's why I power it with maximum 3A (29.3v*2.99A=87.6W). I tested it 10 minutes on the bench and the current remains stable. but this still doesn't explain the autonomy. 66.6Wh/87.6W=0.76h =45min. and this is assuming that the converter works with an efficiency of 100%, which obviously does not. so I'm guessing that the current used by the LED fluctuates and may decrease over time. or another explanation may be that the capacity of the li-ion cells increased slightly after several cycles. I got maximum 3000mAh from these cells. but I see in the reviews that some other buyers got more, even 3137mAh. otherwise I can't explain at the moment the 52min autonomy. it's a bit difficult to dismantle the flashlight and test the power consumptions inside, but I will probably do this in the future. and at the lowest light intensity it lasts for 6:10 hours.

@@Sorin_DIY that mean a little less time, about a minute less.

no

no