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  1. D

    Detecting counterfeit 4110 mosfets

    Hi, Where can I purchase original 4110's? Are all the ones sold on eBay from China fake?
  2. D

    The Consequence Of Not Using BMS With LiPo Batteries

    The problem with this monitor is that it only monitors the entire pack's voltage, so 1 cell can discharge below 3v and it won't set the alarm because the voltage of the good cells compensate The monitor that I suggested monitors each cell's voltage separately, so the moment one of the cells...
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    The Consequence Of Not Using BMS With LiPo Batteries

    Yep, I use 2 of them myself. No problems like the reviewers wrote. Very cheap and very accurate. BTW, where did you get the 10000mah packs?
  4. D

    The Consequence Of Not Using BMS With LiPo Batteries

    Just use two of these while discharging. They will monitor your cell voltage, and start beeping if one of the cells goes bellow 3.0v http://www.hobbyking.com/hobbycity/store/uh_viewItem.asp?idProduct=8927&Product_Name=BM-6_Cell_Voltage_Monitor_2-6S_Lipo_%28New_Version%29
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    Zippy Flightmax / Turnigy lipo testing

    My 2 cents. Since you can't agree on a preferable battery configuration, wouldn't it be best to ask HK to sell loose 5Ah cells (preferably with copper tabs for easy soldering) and the small circuit board they use for connecting cells in series/parallel? Then each user can assemble his own pack...
  6. D

    LiPo battery care and basic information

    Hi Spanky, You don't have to set the charger voltages. Just input the number of cells in the pack (5S) and the charger will take care of the voltage. You can also set the charging current. It is not recommended to charge over 1C, 5A in your case. You just connect the pack's main wires and the...
  7. D

    Connectors

    Hi Luke, I was thinking of using a servo connector http://www.hobbyking.com/hobbycity/store/uh_viewItem.asp?idProduct=5493 where I need 3 pin connectors and the JST connector http://www.hobbyking.com/hobbycity/store/uh_viewItem.asp?idProduct=5496 for 2 pin. What do you think? is the servo...
  8. D

    Connectors

    Thanks LiveForPhysics, but those connectors are intended for soldering to a PCB, not cable to cable. I dont like the fact that I need to use shrink tubing on each pin and that the body is so tiny that when detaching the connectors you might pull off the wires by mistake. A good connector body...
  9. D

    Connectors

    Where can I buy these? Do you crimp the pins, or solder? Can the pins be easily inserted/removed from the housing?
  10. D

    Connectors

    Hi, A short poll. What type of connectors do you use for connecting wires that do not carry high currents/voltages (i.e control signals)? I currently use the standard connectors that come on the controllers (http://tncscooters.com/product.php?sku=101162), but I am not very happy with this type...
  11. D

    LiPo battery care and basic information

    Nope, no problem at all. I built a 8s4p pack using 4s1p 4000mAh packs I ordered from eBay. Just hooked up all 4 balancing taps together.
  12. D

    Looking 4 a DC-DC converter

    But will the one from Allelectronics work down to 24v?
  13. D

    Looking 4 a DC-DC converter

    Cant find the 24v Vicors on eBay. According to the tests I saw on a different thread, using a AC-DC switching power supply as a DC-DC is much less efficient 79% compared to > 90%. It's amazing how cheap you can get an AC-DC 12v5A P.S on eBay for. I cannot understand how parts+labor+shipping can...
  14. D

    seen this....?

    Hi Matt, Check out this thread on the HobbyKing forum: http://www.hobbycity.com/hobbycity/forum/forum_posts.asp?TID=289 by liveforphysics (from our forum as well?) He says that the new generation of Turnigy ESCs are pretty good, and do not loose sync with the motors at any time. These...
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    Looking 4 a DC-DC converter

    And one for $12: http://cgi.ebay.com/AC-Adapter-Power-Supply-for-LCD-monitor-TV-Cord-12V-5A_W0QQitemZ260377413127QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3c9fb40607&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A15|39%3A1|240%3A1307|301%3A1|293%3A1|294%3A50
  16. D

    Looking 4 a DC-DC converter

    Thanks. The question is how is their efficiency at these low input voltages? Here's one for $10+$12 S/H: http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=6256&Product_Name=12V_5A_Power_Supply The DC-DCs on eBay are listed for $20 inc. shipping, and those have efficiency of >...
  17. D

    Looking 4 a DC-DC converter

    Input voltage 34-24v output 12v 3A. I saw a few converters on eBay, but the input voltage range is not suitable. They are either 48v or 24v input. My battery's top voltage is 33.6v, and I think this is too high for the 24v converters, and the pack low voltage cuttoff (24v) is too low for the 48v...
  18. D

    HXT 63-74 200kv Brushless Outrunner on an E-bike

    Just to give you a heads up ... These ESCs are meant to be installed in RC aircraft. The propeller wash is used to cool down the controller. If you dont mount a fan on your ESC it will eventually fry. The shaft on the motor is not designed for the stress the chain is putting on it. You will...
  19. D

    LiPo batteries, balancers and BMSs

    Hi TV, My advice to you is go with the LiPo. This battery is amazing. I recently converted my scooter from Lead Acid to LiPo, and am amazed by the improvement. LiPos have a nearly straight discharge curve whereas SLAs voltage drops as the battery is discharged. This results in speed and torque...
  20. D

    Need help designing a Vectrix Inrush Current Limiter

    Do you want something permanent in the circuit, or do you want something you can take out once you make the connection?
  21. D

    Care of A123 packs for dummies

    I wouldn't go with the A123 cells if you are a newb. They are too expensive to experiment with. I don't like the ping packs either. It's not that the price is bad, it's just that the discharge rate is way too low, and they look like they were made by a first grader. I'd buy a Headway pack that...
  22. D

    Interesting Ev battery monitoring display

    But then again judging by his ampere meter, he can only go up to 1000 Amps ... no way he'll ever get near 1.21GWatt. Now if he had A123s ...
  23. D

    Interesting Ev battery monitoring display

    I wonder what happens when he hits 88 Mph ... :idea: ... it's back to the good ol' 1955.
  24. D

    Best damn 6S lithium monitor on the planet for $15

    I still don't understand how you get these for $15 inc. shipping. I contacted the guy that makes these module directly and he quoted me $15 + S/H. I told him that the EV community would like to have monitors for bigger packs (12S and up) so he told me that if he sees that there is a demand he...
  25. D

    LiPo battery care and basic information

    After seeing pictures of LiPo fires on the web, I intend on buying one of those sacks on Ebay for $12, and then sewing it to perfectly fit my pack. But I read on the RC forums that the guys there either charge their packs in a clay pot, or in a metal ammunition box.
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