FIY this company sold me defective used 280 A-hr batteries.
Some may be new, but 1/2 are definitely used.
FEOGRN off Amazon is the culprit.
Several were swollen upon arrival, but these big LFPs do that sometimes.
I top balanced the set of 16 for a week.
When I placed them in a system several would drop voltage and the BMS would turn off.
I determined it is primarily 2 batteries that drop below 2.6V while the others are at 3.2V.
These 2 perform at less than 1/2 their rated watt - hours
The company expects me to buy a professional charger/ tester to prove the batteries are bad with pictures.
They have no interest in replacing the defective batteries.
I am an electrical engineer and know how to test a battery.
If they want to doubt my test, then they can put it on their tester.
Avoid this company. They sell crap and I am out over $3000.
Some may be new, but 1/2 are definitely used.
FEOGRN off Amazon is the culprit.
Several were swollen upon arrival, but these big LFPs do that sometimes.
I top balanced the set of 16 for a week.
When I placed them in a system several would drop voltage and the BMS would turn off.
I determined it is primarily 2 batteries that drop below 2.6V while the others are at 3.2V.
These 2 perform at less than 1/2 their rated watt - hours
The company expects me to buy a professional charger/ tester to prove the batteries are bad with pictures.
They have no interest in replacing the defective batteries.
I am an electrical engineer and know how to test a battery.
If they want to doubt my test, then they can put it on their tester.
Avoid this company. They sell crap and I am out over $3000.
