Keneng Cells (nee REPT) from Michael B Caro are Grade B

TinkerTom

New Member
Joined
May 9, 2021
Messages
3
Short Version: the cells delivered to me by Michael B Caro were Grade B REPT brand. Not Keheng.
EVE LF280K fit nicely as a replacement, and stay in balance just like the REPT cells do.

Longer version:

Two purposes in this post: 1) show where to get replacement cells for the "Keheng Grade A+" from MCB and 2) Mention a very nice write up from Ghostwriter66 about how to determine cell quality.

I haven't found this anywhere else. I discovered something that others who paid MCB for Keheng 280ah cells might want to know. He said: "I get these cells shipped straight from the factory with no supplier/reseller involved at all. They are True A+ cells that are matched and batched in groups of 16 at the factory and come with the factory test report of the actual cells that are shipped to you." September of 2021 (normal 2 months wait), two of my 16 were delivered damaged, and two were lost by UPS. No factory test report (in the missing box?). I top balanced 8 of them, hooked them up 8S, ran a 1100 watt heater for over 7 hours (down to 2.8 volts lowest cell). So the capacity is good. I was happy.

Six months later, still no replacement cells from MBC.

Dealing with MBC, someone elsewhere here said "it's over with, move on". In the process of moving on about a month ago, I saw this from @ghostwritter66:


That should be in the Beginners Resource section. She wrote that 3 weeks before my cells were delivered. I wish I knew enough then to go find it. I hope that resource helps someone else.

I found a lot of scratched off QR codes underneath the black plastic top cover, between the negative post and the outside of the cell. Except for one.
https://www.gobelpower.com/lifepo4_decoder.html using 08LCB26001179A9BF0100803 shows they are REPT brand 280AH cells, made in late 2019. Not what I was expecting.

There are a lot of great minds on this forum. One of them posted this:

Thanks @RayfromTX.

Jenny Wu came up with Eve LF280K cells. I contacted her thru gmail, then Alibaba. I needed 4 cells to replace the two damaged and two lost cells. Her boss was reluctant to sell me a different brand than what I had. Eventually, she came up with sending me just one, for me to test. It showed up in about a week. The two cell brands are physically the same width and depth, but Eve is taller and has wider terminal post spacing. However, the Eve terminal post landings are closer to the cell. The two brands of cell terminals end up the same height. Nice. I had to re-think bus bars because of the different terminal spacing. I/R was the same (0.17 to 0.19 mOhm measured with YR1035+ - yellow box). I discharged to 50%, uncompressed the pack, randomly pulled a cell out of the 8S pack I had, replaced it with the new EVE cell, then re-compressed. I charged that one cell to the same voltage as the other 7 with a 10 amp lab power supply (Thanks Will). Then fully charged using the inverter. I then ran the same 7 hour discharge test - 1100 watt heater. Electrodacus SBMS0 default voltages are between 3.55 and 2.80 per cell. The bms turns off the charger when any cell is at or below 2.80 volts for at least 3 secs. Full is 3.55 volts for more than 6 seconds. That test came out to 7 kwh, the same as before. Typical resting delta is 4-8 mv. Yea. I ordered the other 3 cells I need to make my 2P8S 560 aH 24 volt battery. I used the one cell I pulled out, plus 3 new Eve cells, plus 4 REPT cells I never used before. Turned on the charger to get close to a top balance. One cell was a lot higher voltage than the others. I ended up charging each one individually within the same 8S pack. I could have drained the high one, but I knew how to charge one at a time.

After all that, another 7 hour test with the same heater, the two 8S 24 volt packs were within 32 watt hours of the same (usable to me) 7Kwh capacity. Nice.

I am going to use this method (PCCB) to build the actual 2P8S battery that will go in our RV.


Thanks @Posplayr.

More on the actual build later.
 

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Diysolar123

Photon Sorcerer
Joined
Feb 28, 2021
Messages
675
yea, Michael B Caro scammed a lot of people here for many thousands of dollars.
Not just bad cells shipped either, but taking money and never delivering ANYTHING.

avoid him like the plague.
 

DEEP WOODS WARNERS

Solar Enthusiast
Joined
Dec 14, 2019
Messages
106
Short Version: the cells delivered to me by Michael B Caro were Grade B REPT brand. Not Keheng.
EVE LF280K fit nicely as a replacement, and stay in balance just like the REPT cells do.

Longer version:

Two purposes in this post: 1) show where to get replacement cells for the "Keheng Grade A+" from MCB and 2) Mention a very nice write up from Ghostwriter66 about how to determine cell quality.

I haven't found this anywhere else. I discovered something that others who paid MCB for Keheng 280ah cells might want to know. He said: "I get these cells shipped straight from the factory with no supplier/reseller involved at all. They are True A+ cells that are matched and batched in groups of 16 at the factory and come with the factory test report of the actual cells that are shipped to you." September of 2021 (normal 2 months wait), two of my 16 were delivered damaged, and two were lost by UPS. No factory test report (in the missing box?). I top balanced 8 of them, hooked them up 8S, ran a 1100 watt heater for over 7 hours (down to 2.8 volts lowest cell). So the capacity is good. I was happy.

Six months later, still no replacement cells from MBC.

Dealing with MBC, someone elsewhere here said "it's over with, move on". In the process of moving on about a month ago, I saw this from @ghostwritter66:


That should be in the Beginners Resource section. She wrote that 3 weeks before my cells were delivered. I wish I knew enough then to go find it. I hope that resource helps someone else.

I found a lot of scratched off QR codes underneath the black plastic top cover, between the negative post and the outside of the cell. Except for one.
https://www.gobelpower.com/lifepo4_decoder.html using 08LCB26001179A9BF0100803 shows they are REPT brand 280AH cells, made in late 2019. Not what I was expecting.

There are a lot of great minds on this forum. One of them posted this:

Thanks @RayfromTX.

Jenny Wu came up with Eve LF280K cells. I contacted her thru gmail, then Alibaba. I needed 4 cells to replace the two damaged and two lost cells. Her boss was reluctant to sell me a different brand than what I had. Eventually, she came up with sending me just one, for me to test. It showed up in about a week. The two cell brands are physically the same width and depth, but Eve is taller and has wider terminal post spacing. However, the Eve terminal post landings are closer to the cell. The two brands of cell terminals end up the same height. Nice. I had to re-think bus bars because of the different terminal spacing. I/R was the same (0.17 to 0.19 mOhm measured with YR1035+ - yellow box). I discharged to 50%, uncompressed the pack, randomly pulled a cell out of the 8S pack I had, replaced it with the new EVE cell, then re-compressed. I charged that one cell to the same voltage as the other 7 with a 10 amp lab power supply (Thanks Will). Then fully charged using the inverter. I then ran the same 7 hour discharge test - 1100 watt heater. Electrodacus SBMS0 default voltages are between 3.55 and 2.80 per cell. The bms turns off the charger when any cell is at or below 2.80 volts for at least 3 secs. Full is 3.55 volts for more than 6 seconds. That test came out to 7 kwh, the same as before. Typical resting delta is 4-8 mv. Yea. I ordered the other 3 cells I need to make my 2P8S 560 aH 24 volt battery. I used the one cell I pulled out, plus 3 new Eve cells, plus 4 REPT cells I never used before. Turned on the charger to get close to a top balance. One cell was a lot higher voltage than the others. I ended up charging each one individually within the same 8S pack. I could have drained the high one, but I knew how to charge one at a time.

After all that, another 7 hour test with the same heater, the two 8S 24 volt packs were within 32 watt hours of the same (usable to me) 7Kwh capacity. Nice.

I am going to use this method (PCCB) to build the actual 2P8S battery that will go in our RV.


Thanks @Posplayr.

More on the actual build later.
I as well was sold those same batteries being told the same thing. Keeping them balanced has been a nightmare. I was also sold 2 48v 16s daly bms and found out there knockoffs.
I ran into some suppliers in whatssapp and found hes been buying Q.C. FAILED batteries and selling them.
I'm also told he spent alot of people's money on buying his own brand batteries to sell on his website.
Along with filtering the money into his motor home and advertising business.
This is all hear say. No actual proof. But I'm told there's enough to hang him in federal court should people band together.
 

TinkerTom

New Member
Joined
May 9, 2021
Messages
3
My observations of people like MBC is that they learn how to protect themselves long before before actually taking people's money. Once legal proof is found, they lose in court, suddenly with no assets. Lawyers may get some money, but no one else. Just an observation.

On the other hand, I might be open to joining a class action, no cost to me, lawsuit. There may be a smart lawyer out there who could figure out how to get something back.
 

Ampster

Renewable Energy Hobbyist
Joined
May 3, 2020
Messages
5,901
Location
Kenwood, California
On the other hand, I might be open to joining a class action, no cost to me, lawsuit. There may be a smart lawyer out there who could figure out how to get something back.
How does a class action recover anything more from a defendant who has no assets? I would guess any lawyer would look at the assets of a proposed defendant before taking on a contingent case.
 
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