Of course it is a good idea but i really do have 50x 18650 cell , i just wanted to use this idea
Interesting…found a design at the other forum
Looking at the spec sheet, it’s not very accurate though
Maybe I can whip up a quad TP4056 board, take 4 of those USB jobbies, put em all on one board, individual charge controller for 4xLi Ion batteries w/ independent channels (might even put the TP4056 chips close enough together to be able to glue a heatsink across them, would anyone be interested in this idea?
The latest EAGLE files are here.
What would be the point? They can only do like 700mA each IIRC and the existing boards are $1.15/ea fully populated. You just glue however many of those whole boards you want to the heatsink …assuming you really want to go to the trouble of using TP4056 for DIY in the first place. I think the DIY we’re interested in would be a 5A per channel charger. Any DIY charger would need a lot of careful consideration. As I’ve mentioned many times, charging is the main risky bit of owning rechargeable Lithium chemistry batteries.
Anyway this isn’t getting us any closer to gamezawy’s goal, so this is absolutely not the right thread to discuss it in. He’s already getting a bad signal to noise ratio from all the folks who stopped by to tell him either that he won’t get super-fast charges (guilty) or that his idea won’t work, or etc. (EDIT: Hope that doesn’t come across as too rude! I just mean we should talk about it in another thread. gamezawy really is going to have a hard time keeping this discussion on topic without the from-scratch DIY charger discussion happening at the same time!)
agreed (however HKJ did a review and they did pretty well at close to 1A (I think the reason it didn’t hit 1A was it thermally throttling itself)
I digress
Thanks much sir!
Gamezawy needs a plan that doesn’t involve importing big heavy parts. Sounds to me like he needs to re-program the microprocessor that controls the charging circuit.
I don't know anything about what rate the laptop pack circuitry would charge at, but it sure sounds like a great budget way to obtain a multi-cell charger. Just need cradles and a power supply.
EDIT: Some of the packs I have torn down charge 4 parallel sets of cells. One could increase the charge rate by reducing the number of parallel cells.
Good point. One thing that seems to keep coming up [but I have no personal experience with] is that some (many?) of these charge controllers flip out when they are exposed to unexpected conditions.
I think it’s also fair to assume that these laptop battery chargers have only a single charging channel. They probably augment that with a balancer. So you can’t just take a 4s2p or 4s1p battery charger and make a cradle for it and then start dumping random cells into it.
Agreed. You would probably have load each of the series channels with similar cells. Even if it doesn't act weird, it will probably only charge all the cells to the lowest capacity bank.
But if you have no money for a dedicated charger, you could hit a recycle bin for a free laptop pack and build a charger that will get you by.
Well, you could that if someone would figure out how to make the laptop charge controller do something for us. 
• Step one, identify the chips used in your laptop battery circuit.
Example
TPC8111: Transistor
BQ8011DBT: Capacity Gauge. Datasheet is proprietary info.
BQ29310PW: Battery Management
S24C0: EEPROM