Search found 178 matches

by vex_zg
Aug 19 2017 6:43pm
Forum: Items for Sale - New
Topic: Batteries, chargers, motors and components made in China
Replies: 20
Views: 2723

Re: Batteries, chargers, motors and components made in China

I know there are quite a few issues now with shipping lithium cells. Would you be able to find shipping method to Europe, and how much would it cost? For example 150 18650GA cells?
by vex_zg
Aug 18 2017 7:31am
Forum: Battery Technology
Topic: Failed Besttech BMS bleed transistor, how to disable?
Replies: 7
Views: 1137

Re: Failed BMS bleed transistor, how to disable?

so, even though that GLCQ IC failed, it is also needed to remove the transistor below it, see picture: https://preview.ibb.co/foPJCQ/20170817_214553_1.jpg When I had tested the BMS After removing only the 6 pin IC marked GCLQ (and leaving the 3 pin transistor in place), still some drain current was ...
by vex_zg
Aug 17 2017 3:39pm
Forum: Battery Technology
Topic: Failed Besttech BMS bleed transistor, how to disable?
Replies: 7
Views: 1137

Re: Failed BMS bleed transistor, how to disable?

I just would not let it go yes you are right it was one of the voltage detection transistors I assume, some are labeled GCLR and some GCLQ . I can't get any datasheet or replacement part on them, so I just lifted that one away. I'm thinking to add LED diodes for all balance circuits to be able to se...
by vex_zg
Aug 17 2017 1:19pm
Forum: Battery Technology
Topic: Failed Besttech BMS bleed transistor, how to disable?
Replies: 7
Views: 1137

Re: Failed BMS bleed transistor, how to disable?

There are lots of variations in BMS design, but most of the typical ones have a separate voltage detector for the balancing shunts that won't affect the LVC and HVC. Those should still work like before. You should check balance once in a while to make sure those cells stay in line. You can manually...
by vex_zg
Aug 17 2017 4:21am
Forum: Battery Technology
Topic: Failed Besttech BMS bleed transistor, how to disable?
Replies: 7
Views: 1137

Re: Failed BMS bleed transistor, how to disable?

thanks for the info!

Yeah, I think the failure actually occured when I was reconnecting the BMS.

I wonder would the LVC per cell still work if I do this mod or just the overall LVC for entire pack? I have no use for overall LVC since I monitor pack voltage anyway on my LCD.
by vex_zg
Aug 16 2017 7:57am
Forum: Battery Technology
Topic: Failed Besttech BMS bleed transistor, how to disable?
Replies: 7
Views: 1137

Failed Besttech BMS bleed transistor, how to disable?

Hi all, I have this BMS Besttech HCX-D131 http://www.bestechpower.com/592v16spcmbmspcbforli-ionli-polymerbatterypack/PCM-D131.html one of the bleeding transistors has failed and is continuously draining one cell group (first group). Fortunately I was checking voltages and caught this failure in time...
by vex_zg
Aug 11 2017 2:11am
Forum: Battery Technology
Topic: 18650 spot welding -how to- ULTIMATE REPOSITORY
Replies: 790
Views: 195586

Re: 18650 spot welding -how to- ULTIMATE REPOSITORY

riba2233 wrote:Great, thank you! 8)
Last year I ordered from 3 sources on aliexpress claiming 99.9% nickel, all turned out to be legit. That can change at any time if they change supplier or just oblivious as to what they are selling. Sretno.
by vex_zg
Aug 11 2017 1:51am
Forum: Battery Technology
Topic: 18650 spot welding -how to- ULTIMATE REPOSITORY
Replies: 790
Views: 195586

Re: 18650 spot welding -how to- ULTIMATE REPOSITORY

Thank you, but it's currently out of stock. Any recommendations from aliexpress? 1 year ago I bought legit nickel from here https://www.aliexpress.com/item/Thickness-0-2mm-Weight-1kg-Low-resistance-99-96-pure-nickel-for-battery-spot-welding-machine/32336236156.html?spm=a2g0s.9042311.0.0.umEoPb and ...
by vex_zg
Jul 22 2017 2:53am
Forum: Items for Sale - New
Topic: Magura MT-7 E (w/ brake regeneration output)
Replies: 13
Views: 3193

Re: Magura MT-7 E (w/ brake regeneration output)

I was in magura stand on the Taipei International Cycle Show this year and asked if they would be doing a MT-7 E version. And they told me that was not on their plans for the close future. So this is a bit strange. :? Well on the picture in the first post of this thread the MT7E lever does in fact ...
by vex_zg
Jul 20 2017 9:48am
Forum: Items for Sale - New
Topic: Magura MT-7 E (w/ brake regeneration output)
Replies: 13
Views: 3193

Re: Magura MT-7 E (w/ brake regeneration output)

it is very difficult to find the magura mt 7 e. I contacted the manufacturer in Germany. there are actually two versions of the mt 7 e. the difference is the integrated switch. one version is equipped with an opener switch, the other with an closer. available as special order only for 115 euro. ral...
by vex_zg
Jul 20 2017 3:00am
Forum: Items for Sale - New
Topic: Magura MT-7 E (w/ brake regeneration output)
Replies: 13
Views: 3193

Re: Magura MT-7 E (w/ brake regeneration output)

it is very difficult to find the magura mt 7 e. I contacted the manufacturer in Germany. there are actually two versions of the mt 7 e. the difference is the integrated switch. one version is equipped with an opener switch, the other with an closer. available as special order only for 115 euro. ral...
by vex_zg
Jul 19 2017 2:17pm
Forum: Items for Sale - New
Topic: Magura MT-7 E (w/ brake regeneration output)
Replies: 13
Views: 3193

Re: Magura MT-7 E (w/ brake regeneration output)

How slim is the part of the caliper and one pad that go behind the rotor? Trying to figure out if it will fit between a rotor and side cover of a hub motor. Basically asking for the measurement shown here in red. Thanks. http://i67.tinypic.com/xcjexs.jpg FYI I have re-asked this question https://en...
by vex_zg
Jul 19 2017 2:16pm
Forum: EBike Technical
Topic: Magura MT7 caliper dimensions ? (for fitting to hub motor)
Replies: 2
Views: 1210

Magura MT7 caliper dimensions ? (for fitting to hub motor)

Trying to figure out if they would fit with a Mxus 3k, if anybody has them - it would help if you could measure this dimension: http://i67.tinypic.com/xcjexs.jpg (as mentioned already in this post but without answer https://endless-sphere.com/forums/viewtopic.php?f=31&t=79942&p=1179048&h...
by vex_zg
Jul 18 2017 1:59pm
Forum: EBike Technical
Topic: how much power can a regular bicycle frame endour?
Replies: 9
Views: 1263

Re: how much power can a regular bicycle frame endour?

dropout view good here http://i.ebayimg.com/images/g/IQ8AAOSw6ShZUDBJ/s-l1600.jpg Thanks to both. I don't plan to use regen just yet, but I understand it doubles the stress on bolts securing axle and torque arms. With most of bicycle frames running 27.5 and 29 wheels now, there is little space left ...
by vex_zg
Jul 17 2017 4:55pm
Forum: EBike Technical
Topic: how much power can a regular bicycle frame endour?
Replies: 9
Views: 1263

Re: how much power can a regular bicycle frame endour?

Thanks to both. These are the dropouts. http://www.thebikelist.co.uk/images/models/Cube/2013/ams-130-pro/7454200-d09-ams-130-pro-black-grey-blue_mini.jpg http://www.njuskalo.hr/image-w920x690/mtb-bicikli/cube-ams-130-pro-18-2013-slika-81427667.jpg I have some torque arms and I can find a way to secu...
by vex_zg
Jul 17 2017 5:34am
Forum: EBike Technical
Topic: how much power can a regular bicycle frame endour?
Replies: 9
Views: 1263

Re: how much power can a regular bicycle frame endour?

More than you can. More than would be pleasant or safe to ride. If you want a motorcycle, use a motorcycle. I don't want a motorcycle, never had one and I don't feel comfortable going more than some 40-50km/h. But I do like torque, for going uphill offroad. Been riding MTB my whole life on all terr...
by vex_zg
Jul 17 2017 3:32am
Forum: EBike Technical
Topic: how much power can a regular bicycle frame endour?
Replies: 9
Views: 1263

how much power can a regular bicycle frame endour?

So, a regular XC/AM full suspension frame, with a direct drive hub motor in rear wheel. What do you think is the maximum power / torque that the frame can take? With 2 torque arms of course.
by vex_zg
Jul 12 2017 6:37pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 458
Views: 77292

Re: Spot Welding Copper Strips to 18650 Battery Cells

Punching the holes is way quicker and makes very clean holes. drilling thin materials usually results in a mess. I built a small hole punch and it takes about 3-5 sec per hole. As for aligning the holes I used a very low tech trick. I cut the copper template out and trimmed to desired fit. Then I g...
by vex_zg
Jul 12 2017 10:28am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 458
Views: 77292

Re: Spot Welding Copper Strips to 18650 Battery Cells

I'm nearly there vex! In my extremely limited available time, I've scraped together several hours and done this: image.jpeg These are .16mm copper punched with 8mm holes directly over the centre of terminal. I will through weld 8x.2mm ni strips to cover holes. Then I weld the nickel to the battery ...
by vex_zg
Jul 12 2017 5:54am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 458
Views: 77292

Re: Spot Welding Copper Strips to 18650 Battery Cells

...even attempting to weld 0.2 copper to an 18650 is really not wise. I see you have had a lot of failures and quite surprised you have not seriously injured yourself or started a fire. Never attempt to hold a pack together 'mechanically' with the electrical conduits - they should only ever carry e...
by vex_zg
Jul 11 2017 6:04am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 458
Views: 77292

Re: Spot Welding Copper Strips to 18650 Battery Cells

The DN10 with custom timing circuit (thanks to Ridethelighting and his Uncle) and tig welding tips - 0.1 copper is a breeze. Have the electrodes suspended from the ceiling for ease of handling. copper.jpg Not to start any flame war... this looks visually appealing... but... I can spot weld up to 0....
by vex_zg
Jul 07 2017 3:21pm
Forum: Battery Technology
Topic: Lithium Batteries Shipping Rules Discussions
Replies: 291
Views: 90580

Re: Lithium Batteries Shipping Rules Discussions

r3volved wrote:
vex_zg wrote:Why would Brexit impact a Dutch store?
I think he means he hopes it doesn't negatively impact shipping requirements for the UK.
That was my first idea but his location is a bit off, Sydney. But whatever. Nkon is currently probably the only reasonable shop with lithium cells in EU.
by vex_zg
Jul 07 2017 1:46pm
Forum: Battery Technology
Topic: Lithium Batteries Shipping Rules Discussions
Replies: 291
Views: 90580

Re: Lithium Batteries Shipping Rules Discussions

Hillhater wrote:
hemo wrote:Nkon in Holland ship using DPD, here in UK they arrived in 4 days in a regular cardboard box with battery labels on. All above board and proper, shipping was 10-12 euros..
Fingers crossed that Brexit negotiations dont slam that door shut !
Why would Brexit impact a Dutch store?
by vex_zg
Jul 03 2017 4:03am
Forum: Battery Technology
Topic: Resistance Soldering Bus Strips to 18650 Cells
Replies: 116
Views: 16792

Re: Resistance soldering bus-strips onto cells

I've used dimmers with mixed results. In theory, the MOT while heating would resemble a resistive load but the inductance of the windings will create some extra voltage transients. They make dimmers designed for motor speed controls that are more likely to survive. Since the soldering pulse is rela...
by vex_zg
Jul 02 2017 5:43pm
Forum: Battery Technology
Topic: Resistance Soldering Bus Strips to 18650 Cells
Replies: 116
Views: 16792

Re: Resistance soldering bus-strips onto cells

Yes, a previous poster stated they achieved good results with an "American Beauty" unit at $450 that provided 2.7V @ 38A (2-second pulse, timed by eyeball). I can afford $450, but I am hopeful that I can find some way to achieve "acceptable" results for less than $200 (and then ...