Search found 336 matches

by thunderstorm80
May 21 2018 2:42pm
Forum: Battery Technology
Topic: Before paying 2000$ to Osnpower - Can I ask your opinion?
Replies: 15
Views: 696

Re: Before paying 2000$ to Osnpower - Can I ask your opinion?

Well, now I am even more confused.
Are you telling me that on the latest pics I've uploaded, where they show what they have in stock now (with the A1) - are authentic but 7 year old cells?
And why do they have to weld the tabs? What is the other (and better) option for assembling the tabs?
by thunderstorm80
May 21 2018 11:25am
Forum: Battery Technology
Topic: Before paying 2000$ to Osnpower - Can I ask your opinion?
Replies: 15
Views: 696

Re: Before paying 2000$ to Osnpower - Can I ask your opinion?

I got another response from OSN, after requesting a modern picture. This is what I got: A123 20AH.jpg 26650.png The 20Ah seems legit pic, but what about the product? Why does it says A1 on the pouch's body? (seems like partly printed "A123") Does anyone can vouch for those cells? The second picture ...
by thunderstorm80
May 20 2018 10:58am
Forum: Battery Technology
Topic: Before paying 2000$ to Osnpower - Can I ask your opinion?
Replies: 15
Views: 696

Re: Before paying 2000$ to Osnpower - Can I ask your opinion?

Hey. Following your recommendations I have asked for pictures. They said they can't send pictures of the 26650 pack because they build it for me once I make an order. (they have the individual cells). For the 20Ah I got this picture: IMG_1770.jpg It looks legit, but then I noticed that this is a pic...
by thunderstorm80
May 18 2018 8:13am
Forum: Battery Technology
Topic: Before paying 2000$ to Osnpower - Can I ask your opinion?
Replies: 15
Views: 696

Before paying 2000$ to Osnpower - Can I ask your opinion?

Hi, After being very happy with my 26650 A123 cells (lost only 20% in 7 years and still goes under heavy usage) and my A123 20Ah prismatic cell's performance, I am about to buy some more cells for my future builds. My current A123 20Ah cells are C grade cells - with 18Ah capacity and short tabs. I'v...
by thunderstorm80
May 03 2018 6:08am
Forum: E-Bike General Discussion
Topic: Where to get -FULL- Fat-Bike fenders?
Replies: 3
Views: 240

Re: Where to get -FULL- Fat-Bike fenders?

They don't seem to have any holes/hangers for mounting them to the standard eyelets on the frame, or am I wrong?
by thunderstorm80
May 03 2018 2:43am
Forum: E-Bike General Discussion
Topic: Where to get -FULL- Fat-Bike fenders?
Replies: 3
Views: 240

Where to get -FULL- Fat-Bike fenders?

Hi, I am looking for full cover fenders, not short one which are just "boards" or "wings" and doesn't actually prevent water from being splashed towards your legs and into the triangle area of the frame. Something like this: https://classic-cycle.com/all/488/fat-bike-plastic-fender-set-26-x-4.0-4.8-...
by thunderstorm80
Feb 08 2018 4:45am
Forum: E-Bike Technical
Topic: Cooling vest for hot&humid conditions
Replies: 6
Views: 387

Re: Cooling vest for hot&humid conditions

I'm suprised no one has come up with a 12v cooler coat that provides actual refrigerated cooling since there are products such as this on the market, https://www.amazon.com/dp/B01N1WQNYM/ref=sspa_dk_detail_4?psc=1 Thermocouples are only few percent efficient, so you would need to spend ALOT of powe...
by thunderstorm80
Feb 07 2018 4:41pm
Forum: E-Bike Technical
Topic: Cooling vest for hot&humid conditions
Replies: 6
Views: 387

Re: Cooling vest for hot&humid conditions

If you want it to be passive, yet absorb heat for hours, then to "recharge" it in minutes the temperature differential you'll have to have to pull out all that heat energy will need to be quite large (meaning, placing it within something VERY cold, (well below water's freezing point; perhaps not qu...
by thunderstorm80
Feb 07 2018 7:27am
Forum: Motor Technology
Topic: Removable method of securing motor's axle nuts
Replies: 16
Views: 1124

Re: Removable method of securing motor's axle nuts

You might find a few options in this thread 8) https://endless-sphere.com/forums/viewtopic.php?f=2&t=26444 I saw this thread and many more similar ones. I don't have the proper skills/knowledge/good access to laser cutting/metal shaping facilities and to plan such a plate correctly regarding to all...
by thunderstorm80
Feb 07 2018 7:22am
Forum: E-Bike Technical
Topic: torque arm picture thread
Replies: 189
Views: 43295

Re: torque arm picture thread

I like that method. If you go back far enough in this thread, I likely posted my version of it, from the death race bike. here it is again. Pinch dropout, on Race bike..jpg Its a really positive method, however you engineer a clamping dropout. Perfect for high power, and strong regen. Feed it enoug...
by thunderstorm80
Feb 07 2018 7:10am
Forum: E-Bike Technical
Topic: Cooling vest for hot&humid conditions
Replies: 6
Views: 387

Cooling vest for hot&humid conditions

Hi, After reading some threads here where different vests were briefly mentioned, I thought it would be effective to start a dedicated thread for it. The problem with reading about different vests on different websites is that they are based on subjective opinions and the full technical specs are di...
by thunderstorm80
Feb 07 2018 6:20am
Forum: Motor Technology
Topic: Removable method of securing motor's axle nuts
Replies: 16
Views: 1124

Re: Removable method of securing motor's axle nuts

Nordlock washers on the nuts torque arms. (if you already have torque arms then they aren't good enough and you need better ones) I use Grin's torque arms. One on each side. One is preloaded in the forward torque direction and one in the reverse. And still - I note that the motor's axle is slowly "...
by thunderstorm80
Feb 07 2018 2:49am
Forum: Motor Technology
Topic: Removable method of securing motor's axle nuts
Replies: 16
Views: 1124

Removable method of securing motor's axle nuts

Hi, The lock-nuts on my H3525 come loose all the time because of the very powerful torque it can provide + changing between forward torque®en + the road vibrations due to the high tire pressure. I have tried applying a special glue for holding metal-to-metal but it also eventually came loose. I k...
by thunderstorm80
Feb 06 2018 5:12am
Forum: E-Bike Technical
Topic: Using bicycle's frame as heatsink for the Phaserunner
Replies: 45
Views: 3663

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

Now that I can finally log the stats from the Cycle Analyst and Phaserunner , I see that even with my kludged on big heatsink, the Phaserunner is still peaking at around 70 degrees Celsius when going up long, big hills. Is it worth trying to get the phaserunner to operate at lower temps or is this ...
by thunderstorm80
Feb 06 2018 5:11am
Forum: E-Bike Technical
Topic: Using bicycle's frame as heatsink for the Phaserunner
Replies: 45
Views: 3663

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

Now that I can finally log the stats from the Cycle Analyst and Phaserunner , I see that even with my kludged on big heatsink, the Phaserunner is still peaking at around 70 degrees Celsius when going up long, big hills. Is it worth trying to get the phaserunner to operate at lower temps or is this ...
by thunderstorm80
Jan 30 2018 12:32pm
Forum: Battery Technology
Topic: Why Li-Ion cells have huge difference between their charge/discharge rates?
Replies: 2
Views: 335

Re: Why Li-Ion cells have huge difference between their charge/discharge rates?

First, before going on with the subject of the topic, you realize that if you are afraid of limping home due to approaching the lvc, you just need to slow down... I remind you that wind resistance energy loss works with the square of speed. With modern CA firmware, you can see your instant Wh/Km rat...
by thunderstorm80
Jan 29 2018 12:13pm
Forum: Battery Technology
Topic: Why Li-Ion cells have huge difference between their charge/discharge rates?
Replies: 2
Views: 335

Why Li-Ion cells have huge difference between their charge/discharge rates?

Hi, Can anyone explain why the huge differences? For example, MG1 cells can be charged at ~0.5C but discharged at ~3C with no problem. Further more, many LiPo's (or as I call them - gunpowder :mrgreen: ) can be discharged at a whopping rate of 90C but only charged at 0.5C~1C or so. Chemistry is not ...
by thunderstorm80
Jan 20 2018 10:50pm
Forum: Battery Technology
Topic: Given 80 90 100 % what is the sweet spot?
Replies: 13
Views: 984

Re: Given 80 90 100 % what is the sweet spot?

You'll notice I am not advising riding off less than 100% charge. I don't see any benefit to discharging the battery deeper on any cycle. Its time at 100% charge that matters, more than anything. Ride off right away and you have nearly no time full. You are back to 90% in a mile or so. I strongly d...
by thunderstorm80
Jan 16 2018 7:53am
Forum: Battery Technology
Topic: Lithium Batteries Shipping Rules Discussions
Replies: 278
Views: 47528

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 9:57am
Forum: Battery Technology
Topic: Building many smaller A123 packs (NO BMS) and add them together
Replies: 12
Views: 729

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 5:40am
Forum: General Discussion
Topic: Dogman Dans E bike burns his house.
Replies: 172
Views: 18733

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 4:56am
Forum: Battery Technology
Topic: Panasonic NCR18650GA disclosed specs, and 30Q Samsung cells
Replies: 17
Views: 1693

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 4:53am
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 1275

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 10:49pm
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 1275

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 3:02pm
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 1275

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...