markz
100 TW
What interests me the most is the first module.
New Battery in DMM and solid contact with leads.
These two modules Z and Y were paralleled, that is why they are so similar.
MODULE Z - Can save four 18650's maybe six.
I measure entire 5S2P group and I get 5.40V and moves down slowly, never stable.
I measure 2 parallel groups at a time and it becomes interesting.
First two on negative side (call them A + B) 7.92V which is good!
Now row B + C is 0.98V not good
C + D same voltage 0.98V
D + E same 0.98V
Individual Pairs 1S2P
E = 2.75V Hopefully GOOD
D = 4.0V BAD
C = 2.96V BAD
B = 4.0V GOOD
A = 3.9V GOOD
The measurement of 1S2P look normal but out of balance but within cell range, but the 0.98V 2S2P I get from measuring is not good. I am wondering why I get those measurements. I kept measuring full pack voltage, and was getting lower then expected voltage after measuring individual voltages of each 1S. So you see my dilemma. I knew something was up so I broke the pack down even further and came across these two 5S2P modules that were bringing the entire pack down. I find it odd that the voltage reading starts at a given voltage, then slowly and always move lower and lower. Obvious sign of weakness for those pairs.
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MODULE Y - Can save four 18650's maybe six.
Individual Pairs - parallel groups (2P)
E = 3.9 negative side of module GOOD
D = 4.0 GOOD
C = 0.9 never stable
B = 4.0 Maybe GOOD
A = 1V never stable
Entire module 2.5V never stable
A and B - Nothing stable
BC - Nothing stable
CD - Nothing stable
DE - 7.90V GOOD
New Battery in DMM and solid contact with leads.
These two modules Z and Y were paralleled, that is why they are so similar.
MODULE Z - Can save four 18650's maybe six.
I measure entire 5S2P group and I get 5.40V and moves down slowly, never stable.
I measure 2 parallel groups at a time and it becomes interesting.
First two on negative side (call them A + B) 7.92V which is good!
Now row B + C is 0.98V not good
C + D same voltage 0.98V
D + E same 0.98V
Individual Pairs 1S2P
E = 2.75V Hopefully GOOD
D = 4.0V BAD
C = 2.96V BAD
B = 4.0V GOOD
A = 3.9V GOOD
The measurement of 1S2P look normal but out of balance but within cell range, but the 0.98V 2S2P I get from measuring is not good. I am wondering why I get those measurements. I kept measuring full pack voltage, and was getting lower then expected voltage after measuring individual voltages of each 1S. So you see my dilemma. I knew something was up so I broke the pack down even further and came across these two 5S2P modules that were bringing the entire pack down. I find it odd that the voltage reading starts at a given voltage, then slowly and always move lower and lower. Obvious sign of weakness for those pairs.
-------------------------------------------------
MODULE Y - Can save four 18650's maybe six.
Individual Pairs - parallel groups (2P)
E = 3.9 negative side of module GOOD
D = 4.0 GOOD
C = 0.9 never stable
B = 4.0 Maybe GOOD
A = 1V never stable
Entire module 2.5V never stable
A and B - Nothing stable
BC - Nothing stable
CD - Nothing stable
DE - 7.90V GOOD