steveo
100 kW
During the last few weeks I've been doing individual cell testing for all my Dewalt cells individually. I had charged up & balanced each pack, then i let the chemistry settle for a few days.
I've been using the sr960 Mega power Charger/discharger/balancer for my testing (I have this charger modified like doctorbass did for 4 wire sensing to get more accurate results)
Majority of my cells are in the 2200mah+ rating with the exception of a few cells & packs ranging 2100mah - 2199.
All cells that i have tested have fallen for the internal resistance mark, about half dozen at 11mohs, and the rest ranging from 13-12mohms
Here are some photos of my progress
Cells about 60% all tested
This is how i bent the tabs to latter sodder when assembly of the packs!
Lower Voltage Cells (Anything below 2v was placed aside)
Here is an example of a cell discharged beyond 2volts, but THE READINGS ARE GOOD BASED ON TESTING!
another example, this one has lot some capacity.
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I had a few questions to clarify, as per there are many experts out there that have already done this 8)
Low discharged cells
What should i do with the cells discharged pass 2v but still give excellent readings? can i still use them? what is the down side if i do use? Has there life been impacted alot, how many cycles could they have possibly lost say they where that way for about 1 months time ? ( i usually get cell packs every month )
Battery pack configuration to go with
I am looking the build either 5p 30s battery pack setup; or .. I've been thinking about going 23ah with 10p, 30s and using the dewalt black balancing side covers to hold them together 23ah each 2.3ah pack, it will be difficult but defiantly possible to mount
Connections after all testing completed
I will be using 10awg for my connections & 45amp Anderson connectors
Now I'm Still Looking for suggestions for my battery pack building *********HELP*********
My objective here is to try to keep the balancing side covers to hold the cells together if Possible!!!
-i could solder the tabs to the 10awg directly, I would have to cut all the side covers for this.
-I could use copper brad equivalent to 10AWG
link >>> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=230239533920
-I could use like a metal, steel rod, something i could solder to and could handle discharge of min 45-60amps.
Any Feedback from everyone would be awsome.
thanks
Steve
`
I've been using the sr960 Mega power Charger/discharger/balancer for my testing (I have this charger modified like doctorbass did for 4 wire sensing to get more accurate results)
Majority of my cells are in the 2200mah+ rating with the exception of a few cells & packs ranging 2100mah - 2199.
All cells that i have tested have fallen for the internal resistance mark, about half dozen at 11mohs, and the rest ranging from 13-12mohms
Here are some photos of my progress
Cells about 60% all tested
This is how i bent the tabs to latter sodder when assembly of the packs!
Lower Voltage Cells (Anything below 2v was placed aside)
Here is an example of a cell discharged beyond 2volts, but THE READINGS ARE GOOD BASED ON TESTING!
another example, this one has lot some capacity.
=============================================================================================================================
=============================================================================================================================
I had a few questions to clarify, as per there are many experts out there that have already done this 8)
Low discharged cells
What should i do with the cells discharged pass 2v but still give excellent readings? can i still use them? what is the down side if i do use? Has there life been impacted alot, how many cycles could they have possibly lost say they where that way for about 1 months time ? ( i usually get cell packs every month )
Battery pack configuration to go with
I am looking the build either 5p 30s battery pack setup; or .. I've been thinking about going 23ah with 10p, 30s and using the dewalt black balancing side covers to hold them together 23ah each 2.3ah pack, it will be difficult but defiantly possible to mount
Connections after all testing completed
I will be using 10awg for my connections & 45amp Anderson connectors
Now I'm Still Looking for suggestions for my battery pack building *********HELP*********
My objective here is to try to keep the balancing side covers to hold the cells together if Possible!!!
-i could solder the tabs to the 10awg directly, I would have to cut all the side covers for this.
-I could use copper brad equivalent to 10AWG
link >>> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=230239533920
-I could use like a metal, steel rod, something i could solder to and could handle discharge of min 45-60amps.
Any Feedback from everyone would be awsome.
thanks
Steve
`