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Search: Posts Made By: DrkAngel
Showing results 1 to 32 of 32
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Forum: Electric Bikes
10-12-16, 08:02 AM
Replies: 72
Views: 29,973
Posted By DrkAngel

More ... Battery Builds ... (Recycled Laptop LiPo)

Built 3 battery "packs" recently, from recycled Lipo cells. ... http://www.bikeforums.net/attachment.php?attachmentid=285519&d=1353887275&thumb=1&stc=1 ...

1. 3s20p = 11.1V (12.6V charged)...
Forum: Electric Bikes
09-20-15, 02:19 PM
Replies: 72
Views: 29,973
Posted By DrkAngel

Lightbulb Comparative IR as Capacity Estimate

Using Comparative IR as Capacity Estimate

With the large quantity of cells that I am testing, it seems proven out that ...

With cells of same manufacture, (age, batch etc.), and same starting...
Forum: Electric Bikes
09-20-15, 08:49 AM
Replies: 72
Views: 29,973
Posted By DrkAngel

Lightbulb 1000 Laptop Cell Recycle Job

Half way into the process of evaluating a large batch of LiPo cells ... the deal for my chosen motorcycle, for electric conversion ... fell through.
So, might have some tested and rated cells...
Forum: Electric Bikes
06-14-15, 06:30 PM
Replies: 72
Views: 29,973
Posted By DrkAngel

I'd have to recommend high output RC Lipo only,...

I'd have to recommend high output RC Lipo only, for any copter.
Laptop LiPo - Li-ion are designed for larger capacity, which sacrifices maximum amp output.
Check out Hobbyking.com for LiPo and...
Forum: Electric Bikes
05-17-15, 09:41 AM
Replies: 72
Views: 29,973
Posted By DrkAngel

Cool To BMS or To Not BMS?

With properly tested, matched and monitored cells ...
A BMS becomes more an expensive security blanket than a necessity.

Test cells

1. Eliminate self discharging cells!
Charge cells to rated...
Forum: Electric Bikes
03-21-15, 07:24 PM
Replies: 72
Views: 29,973
Posted By DrkAngel

"New" cells does not guarantee them being of good...

"New" cells does not guarantee them being of good condition!

Especially with budget priced cells, quality control-consistent quality is often lacking.
Test thoroughly and if possible, demand...
Forum: Electric Bikes
03-16-15, 07:41 AM
Replies: 72
Views: 29,973
Posted By DrkAngel

Lightbulb Laptop Cells vs RC Lipo

Laptop cells are designed to be the safest possible.
RC Lipo are designed as the most volatile - capable of the most dramatic discharge-danger!

If built with optimal quality control and treated...
Forum: Electric Bikes
12-01-14, 08:54 AM
Replies: 72
Views: 29,973
Posted By DrkAngel

Cool Got 108 excellently capacity matched cells ready...

Got 108 excellently capacity matched cells ready for my 33.3V 31.2Ah, (1kWh), eZip pack build.
33.3V x 31.2Ah = 1038.96Wh (1kWh+)
Compared to the OEM
24V x 10Ah 240Wh/2(SLA) = 120Wh
So 800% the...
Forum: Electric Bikes
11-21-14, 09:49 PM
Replies: 72
Views: 29,973
Posted By DrkAngel

Cool Testing up my latest 12 x 3s4p batteries in bulk....

Testing up my latest 12 x 3s4p batteries in bulk.
(2 batches of 6 x 3s4p)

http://endless-sphere.com/forums/download/file.php?mode=view&id=151316
1. Removed from packs
2. Used imax B8 to...
Forum: Electric Bikes
10-23-14, 04:24 AM
Replies: 72
Views: 29,973
Posted By DrkAngel

Lightbulb Bulk Cell Testing

All battery types self-discharge!
Test is to determine rate and depth of self-discharge ... to eliminate dangerous cells by diagnosing abnormal self discharge.
I recommend self bleed down test only...
Forum: Electric Bikes
10-03-14, 08:09 AM
Replies: 72
Views: 29,973
Posted By DrkAngel

Lightbulb Previously, I have documented a wide variety of...

Previously, I have documented a wide variety of mods for the MeanWell S-150-24. (http://endless-sphere.com/w/index.php/Standard:_S-XXX-YY)

Spotted a cheap Volt amp meter that inspired me to one...
Forum: Electric Bikes
07-23-14, 06:06 AM
Replies: 72
Views: 29,973
Posted By DrkAngel

Cool 25.9V 25.92Ah eZip LiPo Build + Rebuild

Sadly my "repair" with added support etc. failed miserably!
2 banks showing additional damage, after a few cycles.
So, rather than another "repair" I pulled the 6 major banks and replaced with new...
Forum: Electric Bikes
07-22-14, 07:41 AM
Replies: 72
Views: 29,973
Posted By DrkAngel

Cool 22.2V 6s LiPo Bulk Charger (24.84V 6A)

Built 24.84V 6A MeanWell charger (S-150-24 (http://endless-sphere.com/forums/viewtopic.php?f=2&t=42793)) ... for 22.2V LiPo pack.
Yes I labeled it.
Don't want to plug into wrong pack!
18ga...
Forum: Electric Bikes
07-22-14, 05:58 AM
Replies: 72
Views: 29,973
Posted By DrkAngel

Lightbulb 22.2V 30.24Ah Battery Build

22.2V 30.24Ah NOS Laptop Lipo ... ""100701" = 2010 July 01 dated cells.
I know, I know ... I said 22.2V was too wimpy!

But, I tried my latest 25.9V 25.92Ah battery build on my latest ...
2013...
Forum: Electric Bikes
01-27-14, 09:43 AM
Replies: 72
Views: 29,973
Posted By DrkAngel

Gitten-er-done! After draining my 33.3V 26Ah...

Gitten-er-done!

After draining my 33.3V 26Ah (9s10p) to 33.2V, ~3.7V per bank, I marked resultant voltages and added complementary 2s to each bank as deemed advisable.
Lowest bank got the best...
Forum: Electric Bikes
01-25-14, 08:16 AM
Replies: 72
Views: 29,973
Posted By DrkAngel

Lightbulb 33.3V 31.2Ah eZip RMB Pack Build

Well, I keep claiming that I have squeezed the maximum number of 18650s into the oem eZip pack.
7s12p .. 8s12p ...
Finally ... this might be true.

Next build was going to be a "hybrid" 18650 &...
Forum: Electric Bikes
01-05-14, 01:38 PM
Replies: 72
Views: 29,973
Posted By DrkAngel

Lightbulb Interesting, I have noticed ... In many...

Interesting, I have noticed ...

In many years and with many many builds, 18650 laptop cells seem extremely ... reliable-consistent.
In series + parallel they never seem to fail ... they just fade...
Forum: Electric Bikes
01-01-14, 09:29 AM
Replies: 72
Views: 29,973
Posted By DrkAngel

"New, Tested RC Lipo cells" ... ? New,...

"New, Tested RC Lipo cells" ... ?
New, (manufacturer) Tested RC Lipo cells are a major source for damages, fires, "explosions" etc.!

You must mean tested by you ... the 1% Elite?

Seems like...
Forum: Electric Bikes
12-24-13, 05:22 PM
Replies: 72
Views: 29,973
Posted By DrkAngel

Just curious ... I'm interested in your...

Just curious ...
I'm interested in your (Ypedal's) safety rating of various battery types:

Personally, I would rate:
1. RC Lipo as most hazardous (Numerous fires, "explosions" etc.)
2. SLA -...
Forum: Electric Bikes
12-11-13, 12:00 PM
Replies: 72
Views: 29,973
Posted By DrkAngel

There were defective batches of cells produced...

There were defective batches of cells produced for Dell, back in the 20th century, and limited problems with some Sony ~2006.

More recently, major manufactures seem to stringently safety test...
Forum: Electric Bikes
12-11-13, 09:43 AM
Replies: 72
Views: 29,973
Posted By DrkAngel

Lightbulb 18650 cells dangerous! ... ?

A couple ES members warned about dangerous 18650 cells!
One, went so far as demonstrating how dangerous they are!
Enjoy ...

"18650 cells dangerous! ... ?

I have to compliment Liveforphysics...
Forum: Electric Bikes
12-09-13, 08:34 AM
Replies: 72
Views: 29,973
Posted By DrkAngel

Lightbulb More Homemade Recycled Builds

25.9V 22.8Ah New RC LiPo - proposed build - 7s4p - 2011
http://endless-sphere.com/forums/download/file.php?id=60959

37V 17.1Ah New RC LiPo - proposed build - 10s3p - 2011...
Forum: Electric Bikes
11-01-13, 08:47 PM
Replies: 72
Views: 29,973
Posted By DrkAngel

Lightbulb Optimal Voltage

With all Lithium battery packs, there is a recommended charge voltage.
With Li-ion and Lipo, this is typically 4.2V per cell.

This voltage is the manufacturers "maximum capacity" rating....
Forum: Electric Bikes
01-13-13, 06:00 PM
Replies: 72
Views: 29,973
Posted By DrkAngel

Lightbulb Bulk Charging?

Bulk charging refers to the method of charging by the process of applying a single connection-voltage to an entire pack.

My builds do use balance connectors, so all the parallel cells are...
Forum: Electric Bikes
01-08-13, 10:46 PM
Replies: 72
Views: 29,973
Posted By DrkAngel

Lightbulb Dangerous?

Low voltage is monitored via low voltage alarm with constant voltage displayed for each bank.
Preliminary charges - discharges are monitored, then each bank rearranged for equal capacity.
Then,...
Forum: Electric Bikes
01-08-13, 07:58 AM
Replies: 72
Views: 29,973
Posted By DrkAngel

Lightbulb No BMS ! ... ???

LiCo - Lithium Cobalt Batteries - I've previously used a "BMS", for charging, to take advantage of balance function. After much experience, I observed a reliable return to original cells charged...
Forum: Electric Bikes
01-01-13, 12:24 PM
Replies: 72
Views: 29,973
Posted By DrkAngel

Lightbulb 22.2v! ... ?

22.2V (25.2V full charge) might sound pretty wimpy compared to to oem 24V SLA (26V+ full charge).
But considering the voltage sag from the SLA under use, the minimal sag from the 40Ah Li-ion, and...
Forum: Electric Bikes
12-31-12, 05:18 AM
Replies: 72
Views: 29,973
Posted By DrkAngel

Lightbulb Homemade Batterry Packs - Rebuild

I decided to rebuild all my 2008 era "homemade" 18650 packs.
Most have been sitting a couple years.
I noticed a bad "balance" on my 37V 20.8Ah build.
So I have decided to rebuild my 3 - 37V 20.8Ah...
Forum: Electric Bikes
12-29-12, 01:21 AM
Replies: 72
Views: 29,973
Posted By DrkAngel

Lightbulb 44 Magnum

Many of the recycled cells, that I find available, come in convenient "packs" of 3, 11.1V (12.6V charged).
Previously I broken up this "natural" package to produce 10s - 37V (3 - 3 packs plus 1...
Forum: Electric Bikes
12-25-12, 06:04 PM
Replies: 72
Views: 29,973
Posted By DrkAngel

25.9V 31.2Ah weighs about 9lb and fits inside the...

25.9V 31.2Ah weighs about 9lb and fits inside the oem eZip pack.
Best of all cost was about $30 for all the cells.
Lucked out on last batch of cells double connected in foldable 6 packs. Minimal...
Forum: Electric Bikes
12-11-12, 08:35 PM
Replies: 72
Views: 29,973
Posted By DrkAngel

Lightbulb Heat 'er Up!

SLA is a major heat producer - 40-50% wasted as heat!
Nimh not quite as bad ... but still can get hot.
Li-ion and lipo, at modest rates, near 100% efficient. No noticeable heat production!

...
Forum: Electric Bikes
12-11-12, 07:46 AM
Replies: 72
Views: 29,973
Posted By DrkAngel

Lightbulb Homemade Battery Packs! ... etc.

I started with cheap eZip eBikes.
Being sadly disappointed with oem battery performance-capacity-endurance I decided to "play" ...

Too many pictures to fit in one post, so supplied links.

36V...
Showing results 1 to 32 of 32


 
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