DIY Senior
New Member
- Joined
- Aug 25, 2022
- Messages
- 23
I finally decided to try my hand at building some batteries. While they were on that sslooow boat I ordered a ZKE EBC-A40L to test the cells when they arrived. They finally got to my doorstep and the ones I have tested so far are remarkably identical. This is the measurements so far:
HOWEVER…I have questions about the curves. This is typical of the first few:
Then I have had 3 that look like this:
I am confused because it appears that it only drew 40A for about 2 hours 15 minutes and then dwindled to zero amps yet it claims to have pulled 332.6Ah. The data is also contradictory in that it shows it pulling 40A for the whole time.
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View attachment 230569
Can someone Please clarify this for me, my brain hurts from spinning in circles!
Do I have some bad cells?
Am I doing something wrong?
Any assistance will be GREATLY APPRECIATED!
Thanks
Cell Number | Date Of Manufacture | Gobel Sticker Values | My Initial Measurements | A40L Capacity Measurements |
1 | 02-22-2024 | 3.2v Ir ≤ 0.25 mΩ | 3.263v 0.22 mΩ | 3.53v to 2.5v = 333.5Ah |
2 | 02-20-2024 | 3.2v Ir ≤ 0.25 mΩ | 3.263v 0.22 mΩ | 3.47v to 2.5v = 331.2Ah |
3 | 02-25-2024 | 3.2v Ir ≤ 0.25 mΩ | 3.263v 0.22 mΩ | 3.52v to 2.5v = 333.4Ah |
4 | 02-24-2024 | 3.2v Ir ≤ 0.25 mΩ | 3.262v 0.22 mΩ | 3.51v to 2.5v = 333.3Ah |
5 | 02-24-2024 | 3.2v Ir ≤ 0.25 mΩ | 3.262v 0.21 mΩ | 3.50v to 2.5v = 331.8Ah |
6 | 02-24-2024 | 3.2v Ir ≤ 0.25 mΩ | 3.262v 0.22 mΩ | 3.51v to 2.5v = 333.4Ah |
7 | 02-21-2024 | 3.2v Ir ≤ 0.25 mΩ | 3.262v 0.21 mΩ | 3.51v to 2.5v = 333.1Ah |
8 | 02-20-2024 | 3.2v Ir ≤ 0.25 mΩ | 3.262v 0.21 mΩ | 3.50v to 2.5v = 333.0Ah |
9 | 02-24-2024 | 3.2v Ir ≤ 0.25 mΩ | 3.261v 0.21 mΩ | 3.50v to 2.5v = 332.9Ah |
10 | 02-24-2024 | 3.2v Ir ≤ 0.25 mΩ | 3.262v 0.22 mΩ | 3.51v to 2.5v = 333.0Ah |
11 | 02-24-2024 | 3.2v Ir ≤ 0.25 mΩ | 3.262v 0.22 mΩ | 3.49v to 2.5v = 332.6Ah |
HOWEVER…I have questions about the curves. This is typical of the first few:
Then I have had 3 that look like this:
I am confused because it appears that it only drew 40A for about 2 hours 15 minutes and then dwindled to zero amps yet it claims to have pulled 332.6Ah. The data is also contradictory in that it shows it pulling 40A for the whole time.
\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\\/\
View attachment 230569
Can someone Please clarify this for me, my brain hurts from spinning in circles!
Do I have some bad cells?
Am I doing something wrong?
Any assistance will be GREATLY APPRECIATED!
Thanks
Last edited: