Lipo are a bit old hat for ebikes but that said I have some that I still use 18560 or 21700 offer better choice now, with Lipo one has a 3.5v - 4.1v window for best results, below 3.5v they will suffer a lot quicker then li-on.
Beginners guide to batteries
- Thread starter paintboy
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well if you put 1285 in and only got 700 back out of it that's your problem there either cheap cells or have been heavily used with 1000s of discharge cycles.
try find a pound shop that sells power banks as got some good 2000-2500mah cells out of some of them.
try find a pound shop that sells power banks as got some good 2000-2500mah cells out of some of them.
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UltraFire TR-26650 3.7V 6000mAh Rechargeable Li-ion Battery(1-Unit)
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you get what you pay for
That doesn't mean anything at all without context.The testing pocedure should be:
1. Charge each one to 4.2v
2. Discharge each one at 1 amp to 3.1v. Make sure that the mAh reading and timer start from zero for the test.
3. The number of hours to discharge will give you the capacity in Ah, so 90 mins is 1.5Ah. The mAh in the bottom right will also give you the capacity in mAh, so you can check one against the other.
If you don't get 5 times the capacity of a single cell when you put 5 cells in parallel, you're probably doing something wrong unless the cells are completely shagged.
That's interesting information about the time to discharge. So it took nighon 2 hrs to discharge so not sure what you mean by that's the capacity. Should be 2 ah ? And why does it show 700 odd mah?
Getting puzzled now
you said the cells are 1500mah but the discharge test shows it only has 700mah in it.
old or well used cells will have higher resistance over time and get hot when charging and thats where your loosing the charge capacity in heat imo.
if you had new cells and done a discharge test it should be pretty close to the stated capacity.
old or well used cells will have higher resistance over time and get hot when charging and thats where your loosing the charge capacity in heat imo.
if you had new cells and done a discharge test it should be pretty close to the stated capacity.
I guess so. They don't get hot at all charging or discharging, bit that's besides the point. Getting only 700 out of one means there's no point discharging it a few times to get an average. It's never going to get near 1500 is it.
it is less than half of there stated capacity so not really going to go up buy much there just crap cells.
what did you want this pack for anyway ?
what did you want this pack for anyway ?
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Just to experiment with until I buy some decent cells and not balls it upit is less than half of there stated capacity so not really going to go up buy much there just crap cells.
what did you want this pack for anyway ?
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As vfr has said charge to full 4.2v (don't worry about any capacity during charging), discharge it at about 1a to 3.1v or if u
you wish 2.8v. The resulting mah is it's approx capacity, you will never get the cells full capacity as this is engineered by producers to buy bragging right vs a rival. Typically producers will discharge right down to 2.5v to max out the capacity rating.
The 15Q will be about 99.9%, not be far off these M series which were also high current power tool cells.
Test of Samsung INR18650-15M 1500mAh (Cyan) (lygte-info.dk)
you wish 2.8v. The resulting mah is it's approx capacity, you will never get the cells full capacity as this is engineered by producers to buy bragging right vs a rival. Typically producers will discharge right down to 2.5v to max out the capacity rating.
The 15Q will be about 99.9%, not be far off these M series which were also high current power tool cells.
Test of Samsung INR18650-15M 1500mAh (Cyan) (lygte-info.dk)
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I see. I ve noticed the charger is finished discharging at 119 minutes 59 seconds every time. That can't be right