Crimp Daddy
Member
- Joined
- Feb 21, 2018
- Messages
- 973
Build guide with test results:
I appears testing IR with the typical 4 bay chargers isnt repeatable, and the community seems to report inconsistent testing using an Opus, Lii-500 and the others
My testing consists of using a single iCharger (hobby charger) for consistency along with a battery holder that was made out of quality silicone leads 12 AWG in size and good cell holder. A good low resistance path of the cells.
The other ends were fitted with Anderson disconnects to increase functionality as a general charging and testing accessory.
I carefully cut away the insulation to expose some wire for each one of the cell holders tabs. I decided to keep it towards the center of the leads in order to give me more position and flexibility for other uses as well.
All connections were soldered and then wrapped in Kapton tape.
After completion I went onto testing some cells...
I moved the cell in and out of the cell holder rotating position on each test. I had 3 different cells that were tested randomly and here are the results.
Samsung 25R Cell 1
65
65
64
64
65
68
4 MAX DELTA
Samsung 25R Cell 2
64
67
63
65
63
63
4 MAX DELTA
Panasonic MH12210
89
86
86
83
86
6 MAXDELTA
Two Samsung 25R
38
38
37
Big Pack
23
25
25
All in all, I think it came out pretty good. I get very consistent results testing IR, and as the cells come off the charger/capacitytester (Opus/Lii-500), its very easy to test each cell on the same equipment and get repeatable results for internal resistance.
It also allows me to connect it to other accessories I have like the 20 cell parallel cradle to use for testing and charging / discharging.
For my smaller power pack projects, I am able to match the capacity and internal resistance from series strings better to better my chances to keep things in balance.
I appears testing IR with the typical 4 bay chargers isnt repeatable, and the community seems to report inconsistent testing using an Opus, Lii-500 and the others
My testing consists of using a single iCharger (hobby charger) for consistency along with a battery holder that was made out of quality silicone leads 12 AWG in size and good cell holder. A good low resistance path of the cells.
The other ends were fitted with Anderson disconnects to increase functionality as a general charging and testing accessory.
I carefully cut away the insulation to expose some wire for each one of the cell holders tabs. I decided to keep it towards the center of the leads in order to give me more position and flexibility for other uses as well.
All connections were soldered and then wrapped in Kapton tape.
After completion I went onto testing some cells...
I moved the cell in and out of the cell holder rotating position on each test. I had 3 different cells that were tested randomly and here are the results.
Samsung 25R Cell 1
65
65
64
64
65
68
4 MAX DELTA
Samsung 25R Cell 2
64
67
63
65
63
63
4 MAX DELTA
Panasonic MH12210
89
86
86
83
86
6 MAXDELTA
Two Samsung 25R
38
38
37
Big Pack
23
25
25
All in all, I think it came out pretty good. I get very consistent results testing IR, and as the cells come off the charger/capacitytester (Opus/Lii-500), its very easy to test each cell on the same equipment and get repeatable results for internal resistance.
It also allows me to connect it to other accessories I have like the 20 cell parallel cradle to use for testing and charging / discharging.
For my smaller power pack projects, I am able to match the capacity and internal resistance from series strings better to better my chances to keep things in balance.