Search found 293 matches

by thunderstorm80
Jan 16, 2018 7:53 am
Forum: Battery Technology
Topic: Lithium Batteries Shipping Rules Discussions
Replies: 272
Views: 36298

Re: Lithium Batteries Shipping Rules Discussions

What about flying with Lithium batteries as a passenger? (when going abroad) I saw the new IATA rules several times, and didn't see any limitation on the number of spare <100Wh batteries you can carry inside the cabin. This means that you can carry as many LiGo batteries as you want, until you reach...
by thunderstorm80
Jan 11, 2018 9:57 am
Forum: Battery Technology
Topic: Building many smaller A123 packs (NO BMS) and add them together
Replies: 12
Views: 166

Re: Building many smaller A123 packs (NO BMS) and add them together

I was thinking of making several A123 ANR 26650 packs. (3,3v nom and 2300mah, each battery) Im considering having 6 packs, each of the battery pack with 6s10p. 1 pack would then give around 19.8 nom volt and 23AH. I want to connect lipo low voltage alarm to the 6 packs, so i can hear the alarm if s...
by thunderstorm80
Jan 10, 2018 5:40 am
Forum: General Discussion
Topic: Dogman Dans E bike burns his house.
Replies: 172
Views: 11932

Re: Dogman Dans E bike burns his house.

Wow! Just saw that thread. I am sorry for you, but I am glad that eventually you are able to resolve the damages with not so much losses of money... This thread gave me another reason to stick to my existing A123's, despite the tempting lightweight (but short life-cycle lived) modern cells. I happen...
by thunderstorm80
Jan 10, 2018 4:56 am
Forum: Battery Technology
Topic: Panasonic NCR18650GA disclosed specs, and 30Q Samsung cells
Replies: 17
Views: 511

Re: Panasonic NCR18650GA disclosed specs, and 30Q Samsung cells

I wanted to find more detailed specs about those cells, but the official ones are very, very shallow. For example, it writes only "standard" charge rate at 0.5C, and I am interested in: 1. The maximum continuously allowed charge rate. 2. The maximum peak charge rate. (Regen peak currents) All(!) 35...
by thunderstorm80
Jan 10, 2018 4:53 am
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 415

Re: A123 20Ah prismatic cells got expanded - What can be done?

Like I said I bounce my bike for 4.5 year old pack put together with plastic totes and duct tape I've dumped my bike 3 times I beat the s*** out of it on the trail. I believe you have contaminants inside the cell and or impurities. Maybe overcharge over discharge. But vibration on a road bike I don...
by thunderstorm80
Jan 08, 2018 10:49 pm
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 415

Re: A123 20Ah prismatic cells got expanded - What can be done?

As far as I know, there should be no problem with vibration as long as the cells are properly constrained. Zero motorcycles use prismatic cells these days (although Li-ion chemistry). This is a high vibration environment also but they hold up fine. Their packs are now fully potted. The cells inside...
by thunderstorm80
Jan 08, 2018 3:02 pm
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 415

Re: A123 20Ah prismatic cells got expanded - What can be done?

I still didn't get an answer for the most important question: The cells got inflated obviously because of the vibrations and the shocks of the road bike frame + their lack of pressure container. I am wondering, if those cells were meant to work at such unsprung environment even if I pack them with r...
by thunderstorm80
Jan 08, 2018 2:59 pm
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 415

Re: A123 20Ah prismatic cells got expanded - What can be done?

Plus where did you get these cells what kind of tabs they have on them to someone add on some tabs and cut them out of a pack. New used and how old are they mine were probably made in 2010 or something I got him 5 years later or whatever that makes I got them second hand a year a go from a friend w...
by thunderstorm80
Jan 07, 2018 5:20 pm
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 415

Re: A123 20Ah prismatic cells got expanded - What can be done?

I have two 12s A123 20ah packs on my bike for 4.5 years and 1,088 cycles. I use at 40 to 90amp now. I get 17ah at that level. Bulk charge to 3.5v and rarely need balance. I had replaced one in the beginning as it puffed and got soft. I built the pack with plastic totes and fiber duct tape. The one ...
by thunderstorm80
Jan 07, 2018 5:11 pm
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 415

Re: A123 20Ah prismatic cells got expanded - What can be done?

A123 20ah as 4s for a car battery sounds good. Like to know how it works out and what size car. 3.5 × 4 = 14 volt high - 2.9 × 4 = 11.4 volt low . A car doesn't have lvc. I mean to use them as an auxiliary 12V battery for emergency - for example to jumpstart a car with a drained lead battery or for...
by thunderstorm80
Jan 04, 2018 5:48 am
Forum: E-Bike Technical
Topic: Using bicycle's frame as heatsink for the Phaserunner
Replies: 34
Views: 1311

Re: Using bicycle's frame as heatsink for the Phaserunner

you guys are really overthinking this. if you run the phaserunner to the point that it needs such a big heatsink, it will eventually fail from its inability to shed the heat to the outer heatsink over time... its a tiny 6fet controller. The PR has a very good rollback mechanism, and as I understood...
by thunderstorm80
Jan 04, 2018 5:44 am
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 415

Re: A123 20Ah prismatic cells got expanded - What can be done?

Sadly, it won't dissolve back. So I just dump those cells, or, use 4 of them as an emergency car starter. I will rebuild the pack with spare good cells I have, and will press it with two aluminium plates. I understand that with proper pressure, even the massive shocks and vibrations of road-bike fr...
by thunderstorm80
Jan 04, 2018 5:19 am
Forum: Battery Technology
Topic: Panasonic NCR18650GA disclosed specs, and 30Q Samsung cells
Replies: 17
Views: 511

Re: Panasonic NCR18650GA disclosed specs, and 30Q Samsung cells

Just looked there are some really goo$ prices from em3 in the sale section. Gonna grab one too! I know em3ev, and they definitely have good prices and nice packs. I wanted to make an order, but it seems they don't ship their product to Israel. (You can't get shipping quote option to Israel) If some...
by thunderstorm80
Jan 04, 2018 12:50 am
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 415

Re: A123 20Ah prismatic cells got expanded - What can be done?

I've read about making a small puncture with a pin and squeezing the gas out, then seal the hole with epoxy. I can't recommend this, but most accounts are that this works. Having too much gas in the pouch will make it hard to get proper compression on the plates. I heard from Russian speaking frien...
by thunderstorm80
Jan 04, 2018 12:43 am
Forum: Battery Technology
Topic: Panasonic NCR18650GA disclosed specs, and 30Q Samsung cells
Replies: 17
Views: 511

Re: Panasonic NCR18650GA disclosed specs, and 30Q Samsung cells

But you know the answer to your question ? The manufacturer said more 0.4C charge will reduce the cycle life....and you want to charge at 1C. So you can expect reduced cycle life....It wont destroy them, just reduce cycle life. ..But how important to you is a reduction in cycle life, compared to lo...
by thunderstorm80
Jan 04, 2018 12:13 am
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 415

Re: A123 20Ah prismatic cells got expanded - What can be done?

I've read about making a small puncture with a pin and squeezing the gas out, then seal the hole with epoxy. I can't recommend this, but most accounts are that this works. Having too much gas in the pouch will make it hard to get proper compression on the plates. I heard from Russian speaking frien...
by thunderstorm80
Jan 04, 2018 12:08 am
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 415

Re: A123 20Ah prismatic cells got expanded - What can be done?

In that case yeah most likely vibration and fretting. The best you can do is fix it firmly to the inside of the enclosure, and fix the enclosure firmly to the chassis of the vehicle. Last thing you want is a cell moving independently of the chassis, even if there's a layer of foam/rubber there to d...
by thunderstorm80
Jan 03, 2018 2:29 pm
Forum: Battery Technology
Topic: Panasonic NCR18650GA disclosed specs, and 30Q Samsung cells
Replies: 17
Views: 511

Re: Panasonic NCR18650GA disclosed specs, and 30Q Samsung cells

keep in mind that the higher rate you charge cells at, the harder it is on them. I know that, but that doesn't really answer my question... :| Most cells have standard charge rate and fast charge rate recommended by the manufacturer. I understand that for those Panasonic cells, the only guaranteed ...
by thunderstorm80
Jan 03, 2018 12:04 pm
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 415

Re: A123 20Ah prismatic cells got expanded - What can be done?

With pouch cells of any persuasion, their biggest threat is physical trauma. Vibration, fretting, rubbing and puncture are real risks which need to be mitigated against. Unfortunately gaffa tape is not as good as a hard enclosure. The gassing happens when a cell is heated excessively - the electrol...
by thunderstorm80
Jan 03, 2018 12:03 pm
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 415

Re: A123 20Ah prismatic cells got expanded - What can be done?

and there are a number of threads about a123 pouch cells, including termination and packaging, which might help you figure out a way to keep this from happening to any other cells. there are specific pressures that need to be applied to them, evenly across their faces (not the edges), which tape wo...
by thunderstorm80
Jan 03, 2018 11:59 am
Forum: Battery Technology
Topic: Panasonic NCR18650GA disclosed specs, and 30Q Samsung cells
Replies: 17
Views: 511

Panasonic NCR18650GA disclosed specs, and 30Q Samsung cells

Hi, I am considering this battery: http://www.ebikes.ca/shop/electric-bicycle-parts/batteries/b5216-lim-dt.html I wanted to find more detailed specs about those cells, but the official ones are very, very shallow. For example, it writes only "standard" charge rate at 0.5C, and I am interested in: 1....
by thunderstorm80
Jan 02, 2018 9:28 pm
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 415

A123 20Ah prismatic cells got expanded - What can be done?

Hi, I use those cells on all my E-bikes. I wrap all of them into a battery pack using several layers of gopher tape, which proved very well for applying the required pressure upon the cells. (I apply pressure by hand when I wrap them, as they require to be pressurized a bit) Yesterday, I discovered ...
by thunderstorm80
Nov 04, 2017 5:30 am
Forum: Battery Technology
Topic: A123 prismatic cells - THE solution?
Replies: 65
Views: 4802

Re: A123 prismatic cells - THE solution?

To my knowledge, not a single vehicle OEM in the world is using A123 products today for an EV traction battery (I think a couple Chinese cars use them for start-stop ICE batteries today). A123 was unquestionably an industry leader when the M1 cell first emerged 11-12 years ago. While holding that t...
by thunderstorm80
Nov 03, 2017 4:53 pm
Forum: Battery Technology
Topic: A123 prismatic cells - THE solution?
Replies: 65
Views: 4802

Re: A123 prismatic cells - THE solution?

Some years ago the A123 M1A/M1B cells had been hyped for RC model usage because of theire robustness and the possibility for charging / discharging them at extreme high levels. I personally have used them too, but replaced them later by LiPos because of the much higher energy and power density. If ...
by thunderstorm80
Oct 25, 2017 9:40 am
Forum: Items for Sale - New
Topic: Compact Field Oriented Controller, ASI + Grin, limited run
Replies: 1029
Views: 131931

Re: Compact Field Oriented Controller, ASI + Grin, limited r

My motor seems to keep going at low amp after applying the throttle. Once it spins up and i release the throttle i still see around 60W going in. I am controlling it with a CA and it shows throttle out voltage as 1.0. The minimum throttle i have on the controller is 1.10. I dont understand why my m...