I am really not understanding this.
I guess I am just dumb. I am lost and probably will never understand this.
I always thought if you put two batteries in parallel that it would double the amp hours. If two 10 Ah SLAs are in parallel then it would be 20 Ah.
The same thing with those 5.0 Ah turnegy packs Dan sent. I was told to parallel them up so I could get two 10 Ah packs.
HOWEVER It appears SUNDER is right according to my Skycharger. I see very little difference so far discharging two cells in parallel than when I discharged one.
Two cells in parallel ? I will need to check the connections as that number should be about double that. I pressed the caps down tight on the cells. I just don't get it and probably never will get it.
I did notice one thing though. It could be my multimeter but the USED packs I got from DAN when balance charged to 4.2 volts went down to about 3.17 to 3.18 volts per cell about 10 minutes after the charger read FULL and I unhooked them.
These were charged the EXACT same way and were only 4.06V after unhooked from the charger. I am going to charge the LiPo packs with the Mega Charger out on the porch now and see what the multi-meter reads. That will let me know if these LG cells are holding a charge or not.
The only other thing is since the LG cells are brand new and not broke in that capacity can raise after a few recharging cycles. Then I will have a more accurate test for capacity. Also I never tested the two cells in parallel. They could have been different voltage.
I am testing all the cells now with the multimeter. The display is close to 3.5 volts and 2,000 mAh. It should be at 3,500 mAh.
Out of 18 cells all were 3.69 to 3.70V except one which is 3.40V. That is the one I did the test on last night obviouslly.
Looking back at yesterdays test from 5.54V to 3.39V capacity increased by about 70 %
Time went from 163 min. to 240 min. The next hour should tell us an interesting story. I can already tell capacity is increasing much faster than voltage is decreasing.
It makes me wonder if I was wrong or do the SONA packs really cutt off at 3.5V. Perhaphs not all 18650 cells are the same but these LG cells seem to have > 70% capacity from 3.5V to 3.0V. Is it possible the SONA packs would also have 70% greater capacity WITHOUT a BMS ? If that is the case should I run the LG batteries down to 3.3 or 3.2V or not?
I am not sure but think those LiPo alarms were pre set to 3.3 or 3.2V. I will find out. Mabye I did not waste my money on them after all.
The characteristics of LiPo are much different. They seem to have 70% of their capacity between 4.1V and 3.7V where 18650 cells are 3.5V to 3.0V. The big question is how long will 18650 cells last if run down to 3V. LiPo sure won't last that long. I proved that beyond a doubt.
I am going to listen to SUNDER this time and let it go as long as it can. Unfortunatlly the timer is set to 240 min. I am close to 3.4V and around 2,800 mAh. It should be at least 3,700 mAh with two cells in parallel. I am discharging at 1 amp as two cells should be double the capacity as one and discharged 1 at 500 mAh.
I build e bikes. There not always pretty or practical but sometimes they work, at least for awhile. Immortality is not a dream but the future of our evolution. We were given the tools to forge our own destiny. We were created in gods image and shall evolve to live forever.