cwah
100 MW
Hello all,
I've decided to get some Sony Konion US18650V3 cells rated at 2250 mAH and see what they have in the stomach:
You can find them in europe here:
http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=181227591293
First, they weight 44g as advertised:
In term of resistance, my icharger found 58mOhm. Doesn't seem bad, but not as good as lipo.
Single cell at 2A charge (1C):
Cell is a little bit warn, not too much. What's surprised me was that the cell reaches very quickly 4.2V, however it was only 60% full. Yes, only 60% full at 4.2V under load. I think A123 perform much better in this area and are fully charged when they reach 4.2V. So please be careful to let your charger pluged in for at least 30mn more to be sure your pack is charged.
Single cell discharge at 2A (1C):
The cell gives a nice discharge curve. Voltage goes down under 1C load but it's not too much. Cell is little warm and gives 2048mAH capacity.
Single cell discharge at 4A (2C):
The voltage literally collapse. The cell is still able to give 1850mAH until it reaches 3V. The cell gets very warm at the end of the discharge, but it looks able to handle 2C current without too much stress.
I've decided to get some Sony Konion US18650V3 cells rated at 2250 mAH and see what they have in the stomach:

You can find them in europe here:
http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=181227591293
First, they weight 44g as advertised:
In term of resistance, my icharger found 58mOhm. Doesn't seem bad, but not as good as lipo.
Single cell at 2A charge (1C):

Cell is a little bit warn, not too much. What's surprised me was that the cell reaches very quickly 4.2V, however it was only 60% full. Yes, only 60% full at 4.2V under load. I think A123 perform much better in this area and are fully charged when they reach 4.2V. So please be careful to let your charger pluged in for at least 30mn more to be sure your pack is charged.
Single cell discharge at 2A (1C):

The cell gives a nice discharge curve. Voltage goes down under 1C load but it's not too much. Cell is little warm and gives 2048mAH capacity.
Single cell discharge at 4A (2C):

The voltage literally collapse. The cell is still able to give 1850mAH until it reaches 3V. The cell gets very warm at the end of the discharge, but it looks able to handle 2C current without too much stress.