Search found 153 matches

by TrotterBob
Jan 09 2022 6:43am
Forum: Battery Technology
Topic: mixed Pb + Lifepo
Replies: 10
Views: 236

Re: mixed Pb + Lifepo

It's that higher level of understanding that I am seeking by posting here. The LiFePO4 pack is Headway cells 40152S. They charge up to about 55V. I want to add about 13V using a 15Ah SLA. I have a (nominal) 60V charger. As previously stated, bad idea. The why is that SLA battery has more internal r...
by TrotterBob
Jan 08 2022 11:24am
Forum: Battery Technology
Topic: "Copper/nickel sandwich" buses for series connections
Replies: 162
Views: 13310

Re: "Copper/nickel sandwich" buses for series connections

The only thing worse than speaker wire on a battery build is copper clad aluminum speaker wire on a battery build. Thats beyond cringy, thats a fire hazard.
by TrotterBob
Jan 04 2022 9:58pm
Forum: Battery Technology
Topic: cheap active cell balancers
Replies: 53
Views: 1294

Re: cheap active cell balancers

The downside is that there's still an imbalance of 0.100v (100mV) after balancing. How long did you leave the balancer plugged in? The Heltec website says work continues until the voltage difference is .03v or less. Which can take a while since the current drops as the voltage delta between cells d...
by TrotterBob
Jan 03 2022 7:08pm
Forum: Battery Technology
Topic: cheap active cell balancers
Replies: 53
Views: 1294

Re: cheap active cell balancers

The reason being any transfer of energy is from a p-group with a higher SoC to a p-group with a lower SoC. JMO, "Cheap" Active balancer boards ... balance by resistance discharging like a cheap BMS only differene is they function throughout the charge (or discharge) not just at the top of...
by TrotterBob
Dec 25 2021 7:53am
Forum: Battery Technology
Topic: cheap active cell balancers
Replies: 53
Views: 1294

Re: cheap active cell balancers

Am I looking for the basic same layout for the same circuitry design? Not sure what you're asking here. The 5A balancers look different. How is your pack assembled? With solder or spot welds or hardware? And the thing to keep in mind that longer wires will add a bit of extra resistance vs the short...
by TrotterBob
Dec 25 2021 7:49am
Forum: Battery Technology
Topic: cheap active cell balancers
Replies: 53
Views: 1294

Re: cheap active cell balancers

john61ct wrote:
Dec 25 2021 1:37am

If you need to utilise more capacity

(really? why? poor planning?)
If all you're going to do is make condescending remarks we have nothing to discuss.
by TrotterBob
Dec 24 2021 2:01pm
Forum: Battery Technology
Topic: cheap active cell balancers
Replies: 53
Views: 1294

Re: cheap active cell balancers

From the gist of your post why would someone in their right mind buy Li-fe instead of Li-on or Li-po. Yet many do ... so their must be a good reason ... Right ? They are rated for 2,000 to 4,000 cycles and are much safer vs li-ion or Lipo. If they do become overcharged or suffer an internal short t...
by TrotterBob
Dec 24 2021 11:12am
Forum: Battery Technology
Topic: cheap active cell balancers
Replies: 53
Views: 1294

Re: cheap active cell balancers

The question I have, and I'm just throwing this out there so nothing personal, is how much real world experience have any of you had with LiFePO4 batteries? They are a whole different animal when it comes to care and feeding and they are not like Li-ion or Lipo packs even when new. The fun starts wh...
by TrotterBob
Dec 23 2021 2:15pm
Forum: Battery Technology
Topic: Balance charge 13s potted pack?
Replies: 15
Views: 296

Re: Balance charge 13s potted pack?

These are the housings: https://www.ebay.com/itm/232392291015 And found a pigtail (with wires) from Aliexpress: https://www.aliexpress.com/item/32483151149.html If you start with just a housing its not too difficult to pry up the little plastic retainer clips and slide out each individual wire. Just...
by TrotterBob
Dec 23 2021 10:21am
Forum: Battery Technology
Topic: Balance charge 13s potted pack?
Replies: 15
Views: 296

Re: Balance charge 13s potted pack?

13S charging? Well theres expensive: https://www.buddyrc.com/products/isdt-x16-dual-channel-2200w-20a-16s-uav-ac-dc-battery-charger And then theres a cheaper way if you're careful: https://heltec-bms.com/project/5a-capacitive-active-equalization-active-balancer/ Those 5A active balancers are also av...
by TrotterBob
Dec 23 2021 6:36am
Forum: Battery Technology
Topic: cheap active cell balancers
Replies: 53
Views: 1294

Re: cheap active cell balancers

LOL YT is not a great way to gather accurate information. Clearly you didnt bother watching the video or even trying to understand the mans methodology. And attack the source arguments are not arguments at all. Just childish hand waving. In fact balancing is 100% unnecessary for battery health. Thi...
by TrotterBob
Dec 23 2021 4:58am
Forum: Battery Technology
Topic: cheap active cell balancers
Replies: 53
Views: 1294

Re: cheap active cell balancers

I need 36v 10 series lithium ion do you have any links to those cheap active cell balancers? My battery is lower by 0.30V on the far end of the charge/discharge cables its never topped up always 80-85% Feebay usually has them. As do the usual suspects, Aliexpress, Banggood, etc. https://www.ebay.co...
by TrotterBob
Dec 23 2021 4:01am
Forum: Battery Technology
Topic: cheap active cell balancers
Replies: 53
Views: 1294

Re: cheap active cell balancers

It is equally valid to do your balancing at **any** SoC / voltage point, so long as your cutoffs are based on cell/group level sensing. But that's OK, i do not want to pointlessly argue further. Nor do I. But the youtubers who've tried it say balancing LiFePO4 tends to be inaccurate in the flat par...
by TrotterBob
Dec 22 2021 4:22pm
Forum: Battery Technology
Topic: cheap active cell balancers
Replies: 53
Views: 1294

Re: cheap active cell balancers

What happens if one fails? Why take the risk if you dont have to?

https://www.youtube.com/watch?v=F1ANSl8Kp20
by TrotterBob
Dec 22 2021 3:08pm
Forum: Battery Technology
Topic: cheap active cell balancers
Replies: 53
Views: 1294

Re: cheap active cell balancers

I have one of those 1.5 amp cell balancers. And thats the maximum amount of current you'll get between cells provided there is enough voltage difference between them. The current drops as the voltages get closer. I wouldnt recommend that model for any pack larger than 4,000mah. Also do not snooze or...
by TrotterBob
Dec 14 2021 2:32am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1511
Views: 232229

Re: kWeld - "Next level" DIY battery spot welder

From what I've seen on youtube those K2 26650 3800mah Lifepo4 Cells need more joules to weld vs your standard issue 18650s. Havent tried it myself. Just a heads up.
by TrotterBob
Dec 09 2021 1:16am
Forum: General Discussion
Topic: Ivermectin/Covid info
Replies: 239
Views: 5419

Re: Ivermectin/Covid info

Hummm, what is the date on that link anyway? Its right there at the top of the article. And its very telling that the subject has been swept under the rug. If you can find a more recent discussion, feel free to post it. Seems the news has moved on to more interesting stuff. https://uk.news.yahoo.co...
by TrotterBob
Dec 08 2021 10:04pm
Forum: General Discussion
Topic: Ivermectin/Covid info
Replies: 239
Views: 5419

Re: Ivermectin/Covid info

Yeah, 94% ≠ 99.997% So it was in fact a lie. One more rude or nasty comment from you and you'll enjoy a permanent spot on my ignore list. Do the math again but pay attention to the part where I said under 50 and fewer than 2 comorbidities. We're done. Get the last word in if you want, I dont care. ...
by TrotterBob
Dec 08 2021 5:50pm
Forum: General Discussion
Topic: Ivermectin/Covid info
Replies: 239
Views: 5419

Re: Ivermectin/Covid info

So, to run your numbers, what you're saying is out of almost 800,000 dead in this country from this plague, there are less than 10,000 dead who had zero or one comorbidities. That has the strong aroma of BS and you're going to need to put up or shut up. If you have no trustworthy citations to suppo...
by TrotterBob
Dec 07 2021 3:32pm
Forum: General Discussion
Topic: Ivermectin/Covid info
Replies: 239
Views: 5419

Re: Ivermectin/Covid info

Funny how so many famous people who speak out against the covid cult end up dead. Just a coincidence, right? ?? No. If you have electricians who speak out against standard safety precautions (i.e. they are staunchly against testing a circuit before working on it, or using lockouts) you would expect...
by TrotterBob
Dec 06 2021 10:46pm
Forum: General Discussion
Topic: Ivermectin/Covid info
Replies: 239
Views: 5419

Re: Ivermectin/Covid info

Interesting news for residents of South Carolina. https://web.musc.edu/about/news-center/2021/09/17/trial-of-outpatient-drugs-for-covid19-opens-to-all-south-carolinians And just what in the NJ deli is going on here is anyones guess. If you can shed some light on this I would be interested to hear ab...
by TrotterBob
Dec 06 2021 4:23pm
Forum: Battery Technology
Topic: Problem with protection board
Replies: 7
Views: 226

Re: Problem with protection board

Solder technique needs work. Too much exposed wire. Is that copper clad aluminum wire? If you didnt already know, that stuff is horrible at making friends with solder.
by TrotterBob
Dec 05 2021 3:32pm
Forum: General Discussion
Topic: Ivermectin/Covid info
Replies: 239
Views: 5419

Re: Ivermectin/Covid info

Lots of mixed signals out there. Maybe we can get this thread back on topic. https://pubmed.ncbi.nlm.nih.gov/33278625/ I wonder how the Ivermectin studies at Duke and Vanderbilt Universities are going. https://www.nwitimes.com/business/local/franciscan-taking-part-in-study-of-whether-medications-lik...
by TrotterBob
Dec 04 2021 9:57pm
Forum: General Discussion
Topic: Ivermectin/Covid info
Replies: 239
Views: 5419

Re: Ivermectin/Covid info

Funny how so many famous people who speak out against the covid cult end up dead. Just a coincidence, right?

Also this thread is hopelessly off topic.
by TrotterBob
Dec 02 2021 5:01pm
Forum: General Discussion
Topic: Ivermectin/Covid info
Replies: 239
Views: 5419

Re: Ivermectin/Covid info

BalorNG wrote:
Dec 02 2021 12:52pm

And Volkswagen was founded by the Nazis. Makes their cars EVIL, right? :)
*sigh*
Yet another strawman and a ridiculous comment. If you have anything of value to add you're welcome to do so. Lets keep the conversation intellectual and genuine for a change.