Topband Navitas Prismatic at BH

[snoobler]

Seriously. They're dainty. I have some 27Ah LMO/NMC cells I'm using, and they are notably larger volume-wise, yet notably lighter.

These things have 6mm terminals on them.

My only complaint was the packaging. They perfectly filled a double wall box. Zero packing or cushioning - a disaster waiting to happen, but I got lucky.

 

[sshibly]

I have to agree, the lime color and size,
2x on packaging, one of my cell came in candy crushed.

snoobler, I did not think of testing capacity as shipped, thanks for doing that

 

[snoobler]

I find it reassuring to confirm they're around 50% SoC.

 

[sshibly]

I find it reassuring to confirm they're around 50% SoC.

Agree,
I took one cell and connected it to my bench PS and it feed 3 amps at 3.62v for 1.5 hours and dropped to very low current. So average the current I estimated 10% additional charge.

 

[snoobler]

I used hobby chargers and individually charged at 20A to 3.65 with a 2A tail current, so I bet you're closer than 10%.

EDIT: Hmmm... 4.5Ah max. I think I read your post wrong. Probably too much voltage drop between cells and PS.

 

[DiyMegs]

Just got one fifth of my order today. First thing is first; TERRIBLE shipping conditions! Looking back at the ad now, definitely not the "custom boxes" from the pictures. Out of the 33 cells that they crammed into one single-walled cardboard box... One cell is dented beyond my feelings of safety for service... ?

 

[Horsefly]

Got my box of 8 today. As others have said, the BH folks didn't go above and beyond with the packing.




Right out of the box I checked the voltages on each cell. 4 were at 3.293V, 2 were at 3.294V, and 2 were at 3.295V.

I wired them up in series and am currently charging the pack to 28V. I've been checking on them, and they are all staying within about 20mV during the charge.

Hey @snoobler you might find this entertaining. I was working on my makeshift flattened pipe busbars when my wife came into the garage. She asked me what I was doing and I said I had received some Lithium Iron batteries. She came over to my bench and looked at them. She smiled and said "So cute!".

 

[Horsefly]

Just got one fifth of my order today. First thing is first; TERRIBLE shipping conditions! Looking back at the ad now, definitely not the "custom boxes" from the pictures. Out of the 33 cells that they crammed into one single-walled cardboard box... One cell is dented beyond my feelings of safety for service... ?

I forgot to mention to you @DiyMegs - None of my cells had any apparent damage. I guess I'm lucky. Good luck with the rest of your cells!

 

[DiyMegs]

I forgot to mention to you @DiyMegs - None of my cells had any apparent damage. I guess I'm lucky. Good luck with the rest of your cells!

Sadly @Horsefly I have received the rest of my cells today and the total damage comes in at 19 damaged cells & 2 lost in transit ?...


Soo now I ask the community members here; what should I do? I truly appreciate what BH does for us. But I'm talking about major damage here and unusable cells. Granted I could have ordered additional cells to cover potential damage, but then again they should have been packaged better.?

 

[Horsefly]

Sadly @Horsefly I have received the rest of my cells today and the total damage comes in at 19 damaged cells & 2 lost in transit ?...


Soo now I ask the community members here; what should I do? I truly appreciate what BH does for us. But I'm talking about major damage here and unusable cells. Granted I could have ordered additional cells to cover potential damage, but then again they should have been packaged better.?

Wow @DiyMegs that really sucks!

If you have 19 that look like those pictured, I would for sure get BH to replace them. These were not sold as used cells, but a new surplus cells. They should still look new when you receive them.

 

[cjusnavy]

Wow, that looks horrible @DiyMegs. I would ask for them to reimburse you for each damaged one along with a portion of the shipping. They were clearly not packaged and handled well at all.

@Horsefly, the problem is BH is out of them. This was a one time listing and I don't think they have any to replace them with.

 

[DiyMegs]

It's just crazy to me that they would ship anything in this manner.?.? My daly bms's from alibaba came in pristine order. I realize cost savings on shipping, but the ad showed "custom foam filled boxes" and then at the bottom says repackaged... they lost 2 cells from this packaging job...

Honestly I'd appreciate a refund @cjusnavy but what do I do with my overall project? I'm hopeful that BH will make this right @Horsefly. Either they'll have additional cells for sale & thus replacements for what was damaged or reimbursement of some kind.?


They really are cute cells! ??????

 

[cjusnavy]

The "custom foam filled boxes" went quick. I should have purchased those the moment I saw them instead of ordering the cells individually. Nervous to see what mine are like when they arrive in a few days.

 

[DiyMegs]

The "custom foam filled boxes" went quick. I should have purchased those the moment I saw them instead of ordering the cells individually. Nervous to see what mine are like when they arrive in a few days.

I truly wish you the best of luck!!!

 

[Horsefly]

...but what do I do with my overall project?

If you were counting on something the size and price that BH was selling them for, you may have a hard time finding a substitute.

 

[Horsefly]

Now that I'm trying to mess with these in various configurations.... I thought I had downloaded something about the specs, but now I can't find them. I know there was some rate information. I'm trying to figure out what they can handle at a continuous discharge, and for a short term discharge. Anyone care to share?

EDIT: Never mind, I found it on the original link.

 

[DiyMegs]

Now that I'm trying to mess with these in various configurations.... I thought I had downloaded something about the specs, but now I can't find them. I know there was some rate information. I'm trying to figure out what they can handle at a continuous discharge, and for a short term discharge. Anyone care to share?

I believe I shared the manufacturer webpage and spec sheet here somewhere.? But 3C max discharge was also noted on BH photos.

Edit: just double checked it's available pulse rate is 5C for 10 seconds. ?

 

[cjusnavy]

 

[sshibly]

yeap, 1 outta 12 packed in a small box was CRUUUUUUUUUUUUUSH, BH took care of it, or will when they get more.

Reach out to them, I have had couple of issues with my orders and both times they took care of it, went above and beyond. Till now they get 4 Gobis from moi.

 

[DiyMegs]

yeap, 1 outta 12 packed in a small box was CRUUUUUUUUUUUUUSH, BH took care of it, or will when they get more.

Reach out to them, I have had couple of issues with my orders and both times they took care of it, went above and beyond. Till now they get 4 Gobis from moi.

That's both good and bad. I'm glad BH is doing the right thing and replacing your crushed cell! I've been trying to call them this morning and keep getting the busy signal ?