Testing questionable LiPo Battery Charger Schematics I found on the internet!
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Date: 2021-07-11
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Comments and reviews: 10
Some
Video Idea. I was wondering if you could use a DW01 protection chip for charging more simply. Could you just smack a 5v USB voltage across it and let the DW01 decide what to do? If the battery has any protection circuit wouldnt it behave as a charging circuit unless you bang 50v across it. I would think that 5v would be a good place to start. I am going to try this tomorrow and see what the readings are. I figure at most I would need a current limiting resistor but if I use one of the crap 500mA useless USB powersupplies that would limit current to 500mA. It should drop as battery voltage approaches nearer to 5v. The overcharge protection should kick out at 4. 2v. I would miss out on the top portion of the charging but that ok.
As a side. I plan to use the DW01 with a solar panel as a charging method. I bought a bunch of modules you showed including a delivery PD/QC3. 0 module and a charging module that uses qc3 as well. It was still cheaper than a powerbank module.
You may have already made the video on this but it would be neat to make a mini mppt circuit to maximum small solar panels. and maybe a charge discharge controller for a couple of lithium cells too on the same board.
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Video Idea. I was wondering if you could use a DW01 protection chip for charging more simply. Could you just smack a 5v USB voltage across it and let the DW01 decide what to do? If the battery has any protection circuit wouldnt it behave as a charging circuit unless you bang 50v across it. I would think that 5v would be a good place to start. I am going to try this tomorrow and see what the readings are. I figure at most I would need a current limiting resistor but if I use one of the crap 500mA useless USB powersupplies that would limit current to 500mA. It should drop as battery voltage approaches nearer to 5v. The overcharge protection should kick out at 4. 2v. I would miss out on the top portion of the charging but that ok.
As a side. I plan to use the DW01 with a solar panel as a charging method. I bought a bunch of modules you showed including a delivery PD/QC3. 0 module and a charging module that uses qc3 as well. It was still cheaper than a powerbank module.
You may have already made the video on this but it would be neat to make a mini mppt circuit to maximum small solar panels. and maybe a charge discharge controller for a couple of lithium cells too on the same board.
reply
Gaurav
Hey! If you're reading this, I really wanted to ask you to make a 2021 version of the DIY variable lab bench power supply. I've seen a lot of other people ask for it too! The LTC3780 based buck boost converter didn't work well for me at all, maybe because i got it from a bad manufacturer. I wasn't able to find the exact one you used, here in India. Would love to see a tutorial based on a different, maybe more powerful buck boost converter. I enjoy watching your videos and learning from them a lot. Keep up the good work!
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Hey! If you're reading this, I really wanted to ask you to make a 2021 version of the DIY variable lab bench power supply. I've seen a lot of other people ask for it too! The LTC3780 based buck boost converter didn't work well for me at all, maybe because i got it from a bad manufacturer. I wasn't able to find the exact one you used, here in India. Would love to see a tutorial based on a different, maybe more powerful buck boost converter. I enjoy watching your videos and learning from them a lot. Keep up the good work!
reply
Some
The first video I watched on Lithium batteries showed how to recovery tool batteries that your charger is saying are no good. Linking batteries sometimes cell direct to cell. If it gets warm you know its working. Lol. Yeah. Some of them prove it by showing the voltage. and then they disconnect the other battery and the voltage dives like a stone. The internet is really garbage. You actually need to be smarter than the information you are looking up since everything is about getting shares and likes.
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The first video I watched on Lithium batteries showed how to recovery tool batteries that your charger is saying are no good. Linking batteries sometimes cell direct to cell. If it gets warm you know its working. Lol. Yeah. Some of them prove it by showing the voltage. and then they disconnect the other battery and the voltage dives like a stone. The internet is really garbage. You actually need to be smarter than the information you are looking up since everything is about getting shares and likes.
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PicoNano
If you want the most life out of your Li-ion cells, according to US Army, charge them at C/10 to 3. 9V instead of 4. 2V!
On an 18650, my tests showed 400mA of loss from the 2500mA cell (load tested 200mAh.
According to US-Army, they get 3x as much life out of theirs!
Maybe because they don't use them much and 3. 9V is closer to the recommended storage voltage for Li-ion of 3. 7V?
They claim a lot of other things.
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If you want the most life out of your Li-ion cells, according to US Army, charge them at C/10 to 3. 9V instead of 4. 2V!
On an 18650, my tests showed 400mA of loss from the 2500mA cell (load tested 200mAh.
According to US-Army, they get 3x as much life out of theirs!
Maybe because they don't use them much and 3. 9V is closer to the recommended storage voltage for Li-ion of 3. 7V?
They claim a lot of other things.
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elminz
Better chargers have a low current precharge if the battery is very low. All proper chargers have something like 1/10th current cut off (e. g. 30mA in this case. Given how advanced and cheap even a basic chargers are these day, I think building your own with discrete stuff is only really useful as a learning exercise. For everything else, IC's can manage it much better.
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Better chargers have a low current precharge if the battery is very low. All proper chargers have something like 1/10th current cut off (e. g. 30mA in this case. Given how advanced and cheap even a basic chargers are these day, I think building your own with discrete stuff is only really useful as a learning exercise. For everything else, IC's can manage it much better.
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HL65536
Nice coincidence: The last few days I designed a 2xLiIon/LiPo charger with balancer (that can later be upgraded in software to charge any other low voltage batteries. Using a ATmega328P freed from Arduino prison that controls current with a DAC that feeds a PNP and an autoranging shunt array for measuring low and high currents.
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Nice coincidence: The last few days I designed a 2xLiIon/LiPo charger with balancer (that can later be upgraded in software to charge any other low voltage batteries. Using a ATmega328P freed from Arduino prison that controls current with a DAC that feeds a PNP and an autoranging shunt array for measuring low and high currents.
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Loukas
The first circuit has a 1. 2 ohm resistor because it assumes that a fully discharged li-ion or li-po battery should be at no less than 3V, so you then have a 1. 2V voltage drop on the resistor, thus 1A.
The 1. 8 ohm for 1. 5 A doesn't make any sense though. It's obviously a typo, as with 0. 8 ohms, ohm's law is in agreement.
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The first circuit has a 1. 2 ohm resistor because it assumes that a fully discharged li-ion or li-po battery should be at no less than 3V, so you then have a 1. 2V voltage drop on the resistor, thus 1A.
The 1. 8 ohm for 1. 5 A doesn't make any sense though. It's obviously a typo, as with 0. 8 ohms, ohm's law is in agreement.
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Inside
Sir can you tell me why irfz44n in mist maker is getting hot and after second it is getting poped up. I have asked this question in your other videos too but you are not responding it might be possible due to many comments in your video, so if u can see it plz help me into it. It will be a great help for me.
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Sir can you tell me why irfz44n in mist maker is getting hot and after second it is getting poped up. I have asked this question in your other videos too but you are not responding it might be possible due to many comments in your video, so if u can see it plz help me into it. It will be a great help for me.
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Jos
Most dangerous video for me it's definitely the Inverter. That one takes the cake by far.
There are some circuits and experiments that hobbyist should not do, like inverters and anything that uses high voltage.
Leave that to us, the EE.
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Most dangerous video for me it's definitely the Inverter. That one takes the cake by far.
There are some circuits and experiments that hobbyist should not do, like inverters and anything that uses high voltage.
Leave that to us, the EE.
reply
Rodrigo
Those multi batteries chargers are expensive but it is worth, easily adjustable charging current, multi cell lithium battery charging feature, not to mention the presets for various types of batteries.
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Those multi batteries chargers are expensive but it is worth, easily adjustable charging current, multi cell lithium battery charging feature, not to mention the presets for various types of batteries.
reply
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