After about 9 weeks (bought them during the worst part of the year), I finally received the 20 Lishen 272 Ah cells earlier this week.
Very well packaged, two per box. I bought 20 just in case there was a bad cell, and I hope to build the 4 extra into a 12V pack if all are fine which is what I am expecting. Shipped 2 per box I believe to be under the maximum weight for FedEx delivery once offloaded from the container ship.
I wanted to test the capacity of these new "Grade A" cells. They certainly do look new, no dents or dings, clean terminals. I am using my trusted iCharger 208B which has been extremely reliable over the years, I do like it a lot. Feeding it with a 28V/25 Amp CCTV Power supply for charging.
I made up some beefy charge leads and charged Cell 1 to 3.6 Volts. My charger measures internal resistance of 29 mOhms vs the label of 0.12, but will check that soon with a known accurate meter and a resistor to confirm.
Charged it to full capacity at 3.6 V at a leisurely 10 Amps. It is amazing how this cell just sucks the juice like a black hole.
After 26 hours and 43 minutes the battery was fully charged, added 232 Ah to the battery. This stopped some time overnight and the cell voltage settled to 3.4 V.
Capacity Test. I discharged the cell at 15 Amps, but I think there is another setting I missed and it self limited to 20 Watts or 6 Amps at the cell voltage.
Confirmed the Amp discharge rate with my Fluke, right on the money.
It is a big cell, took 45 hours to discharge at only a 6A rate, but total capacity is 280 Ah, a bit more than the rating of 272 Ah, nice!
So after some math, I can calculate the SOC from the factory. I am going to recharge cell #1 here to 48 Ah so it is in the same state as the other batteries. I will parallel them till the cells normalize, then use the iCharger to balance charge the cells as two separate 8S packs to top charge them. I made up an 8S balance connector for the charger, it is going to take a while even at the max 20A - but they should be very closely matched for capacity.
So far the cells are impressive. I will document the build of the battery and the installation here as I progress. This will be used as a critical circuit home UPS, using a Growatt 6kw, split phase low frequency inverter. I plan on adding solar panels when I can.
Very well packaged, two per box. I bought 20 just in case there was a bad cell, and I hope to build the 4 extra into a 12V pack if all are fine which is what I am expecting. Shipped 2 per box I believe to be under the maximum weight for FedEx delivery once offloaded from the container ship.
I wanted to test the capacity of these new "Grade A" cells. They certainly do look new, no dents or dings, clean terminals. I am using my trusted iCharger 208B which has been extremely reliable over the years, I do like it a lot. Feeding it with a 28V/25 Amp CCTV Power supply for charging.
I made up some beefy charge leads and charged Cell 1 to 3.6 Volts. My charger measures internal resistance of 29 mOhms vs the label of 0.12, but will check that soon with a known accurate meter and a resistor to confirm.
Charged it to full capacity at 3.6 V at a leisurely 10 Amps. It is amazing how this cell just sucks the juice like a black hole.
After 26 hours and 43 minutes the battery was fully charged, added 232 Ah to the battery. This stopped some time overnight and the cell voltage settled to 3.4 V.
Capacity Test. I discharged the cell at 15 Amps, but I think there is another setting I missed and it self limited to 20 Watts or 6 Amps at the cell voltage.
Confirmed the Amp discharge rate with my Fluke, right on the money.
It is a big cell, took 45 hours to discharge at only a 6A rate, but total capacity is 280 Ah, a bit more than the rating of 272 Ah, nice!
So after some math, I can calculate the SOC from the factory. I am going to recharge cell #1 here to 48 Ah so it is in the same state as the other batteries. I will parallel them till the cells normalize, then use the iCharger to balance charge the cells as two separate 8S packs to top charge them. I made up an 8S balance connector for the charger, it is going to take a while even at the max 20A - but they should be very closely matched for capacity.
So far the cells are impressive. I will document the build of the battery and the installation here as I progress. This will be used as a critical circuit home UPS, using a Growatt 6kw, split phase low frequency inverter. I plan on adding solar panels when I can.
Attachments
Last edited: