TopBand batteries are back at BH

[Joe BoyKey]

NEW 24 Pack 3.2v 25ah Lifepo4 Topband Prismatic

Here are 24 new 3.2v 25ah prismatic lifepo4 cells. These are Topband cells. These cells came out of overstock, never cycled EV modules and every cell is fully tested to meet the most strict standards. Every cell tested between 24-26ah on a higher 1c discharge rate so they are testing perfect and...

batteryhookup.com

Not sure why they are in packs of 24, I only needed 36, but now have 48 ordered, Joe.

 

[Supervstech]

Whatcha going to do about bussbars and nuts?

 

[Joe BoyKey]

Home depot and homemade copper bars - https://www.homedepot.com/p/Everbilt-M6-1-0-Zinc-Metric-Flange-Nut-2-per-Bag-803908/204281762

 

[Joe BoyKey]

Just looking online for 100 m6 1.0 nuts and there are so many types, what's the best nut to use with Topband batteries? those pictured are Serrated Flange Zinc from HD and what to get better price online, thanks Joe.

 

[Vito.a]

Maybe too late, but I get quality nuts and bolts from Allen's Fasteners. Great selection and fast shipping.
https://www.allensfasteners.com/default.asp

Thanks for posting the link to the battery cells.

 

[labeeman]

I got my nuts on Ebay $0.138 each.

 

[Joe BoyKey]

Yes, received mine in 1 day with prime, good price for 304 stainless, Joe.

 

[Joe BoyKey]

@Supervstech All ready to go, except waiting another 2 weeks on Overkill to ship Bms, would You go ahead and build 48v 100ah 4p16s battery now? or wait til bms arrives, worried cells will get out of balance sitting in series waiting, suggestions anyone, thanks Joe.


Since I have 16 green Navitas/Topband and 36 Blue Topband's, Am going to place green as the 1st Battery of each series, will make it easier to see where to hookup balance leads.

 

[labeeman]

I would wait until BMS arrives or until it has shipped. I also have 6 16s4p of those to build one is complete and is being tested. I still have to make the buss bars for 4 of them.

 

[Joe BoyKey]

I would wait until BMS arrives or until it has shipped. I also have 6 16s4p of those to build one is complete and is being tested. I still have to make the buss bars for 4 of them.

What are you using for buss bars, I took 3/8" copper tubing and flattened it a 12 ton press to 1/2" bars, then drilled and cut?

 

[labeeman]

I used 1/2" by 1/8 thick flat bar aluminum as I will be only pulling 30 amps at most of each pack. I do not set up my pack that way I like the 48V terminals as far away from each other as I can get them, get a tool in between that setup and it will ruin your day.

 

[Supervstech]

While it won’t make much difference, the balance leads should be connected to the positive terminal...
I like to center them on paralleled positive cell terminal bars.

 

[Joe BoyKey]

While it won’t make much difference, the balance leads should be connected to the positive terminal...
I like to center them on paralleled positive cell terminal bars.

Am planning on soldering leads to copper bus bar, will post pics if Overkill ever ships Bms, thanks

 

[roadrunner]

Home depot and homemade copper bars - https://www.homedepot.com/p/Everbilt-M6-1-0-Zinc-Metric-Flange-Nut-2-per-Bag-803908/204281762
View attachment 49726

I see the space between the middle bus bars, so is this 12 volt or 24, and its closed at one end right

 

[Joe BoyKey]

48v 100ah - 4 buss bars connect cell 8 to 9 - 4p16s split configuration. They have black tape around them, hard to see.

 

[roadrunner]

thanks, but wrong picture, the one i quoted was your post from #3, the ones in the black plastic crate, looks like 8S or 8P to start.

 

[Joe BoyKey]

thanks, but wrong picture, the one i quoted was your post from #3, the ones in the black plastic crate, looks like 8S or 8P to start.

4p4s 12v 100ah

 

[roadrunner]

thanks, i see the 4S but only see 2P, ill look closer, astill waiting for my batteries to get here, i basiclly want a 24 volt 50AH like your setup with 16 batteries, or done with 8 but i think that is impossible, still learning this S and P stuff