Search found 317 matches
- May 06 2019 11:50pm
- Forum: Battery Technology
- Topic: Rebuilding a Segway I2 Battery
- Replies: 5
- Views: 457
Re: Rebuilding a Segway I2 Battery
I'm pretty sure they are 18650 LiFePo4's.
- May 06 2019 11:16pm
- Forum: Battery Technology
- Topic: Actual Test of Pure Nickel Heat?
- Replies: 24
- Views: 1739
Re: Actual Test of Pure Nickel Heat?
Thats super useful thanks alot btw, for how long did you "stay" on each current for the test? I did the test a couple years ago. It was either 5 or 10 minutes. Certainly long enough to heat soak the material. Keep in mind that real world results will vary a little. This testing was done w...
- May 06 2019 4:21am
- Forum: Battery Technology
- Topic: Actual Test of Pure Nickel Heat?
- Replies: 24
- Views: 1739
- May 06 2019 4:18am
- Forum: Battery Technology
- Topic: Actual Test of Pure Nickel Heat?
- Replies: 24
- Views: 1739
Re: Actual Test of Pure Nickel Heat?
Yes, I've done testing:


- May 06 2019 4:15am
- Forum: Battery Technology
- Topic: Anyone dealt with Tech Direct Inc. LG Chem Modules
- Replies: 25
- Views: 4280
Re: Anyone dealt with Tech Direct Inc. LG Chem Modules
Is this the same company that was selling Leaf modules that only had ~50% of original capacity? In general the industry deems anything in the 70-80% of original capacity range to be end of life (EOL). So you shouldn't buy anything like that. What capacity were the cells originally and what is their ...
- Mar 27 2019 4:47am
- Forum: Battery Technology
- Topic: Which glue to join cells ?
- Replies: 31
- Views: 1457
Re: Which glue to join cells ?
When I have to glue cells together I use Quick Grip. It works great, highly recommended! Been using it for years. Part number 873388
- Mar 12 2019 1:19am
- Forum: Battery Technology
- Topic: The proper (fastest) way solder 18650 cells
- Replies: 4
- Views: 643
Re: The proper (fastest) way solder 18650 cells
The best way to soldier 18650's is not to solder them at all. Spot weld.
- Dec 29 2018 1:12am
- Forum: Battery Technology
- Topic: Power tool batteries...interchangeability ?
- Replies: 29
- Views: 2352
Re: Power tool batteries...interchangeability ?
Black and Decker 36v/40v and Die Hard 40v packs are the same thing. At least the versions that look the same are the same.
Ryobi and craftsman 4v packs (the 1x18650 ones) are the same.
Ryobi and craftsman 4v packs (the 1x18650 ones) are the same.
- Jul 22 2018 4:27pm
- Forum: Battery Technology
- Topic: bought 3 batteres. Shows 3,58V on every 4p. Scam?
- Replies: 8
- Views: 693
Re: bought 3 batteres. Shows 3,58V on every 4p. Scam?
~3.6v is very typical for new cells. They made SOC for shipping even more strict in the past couple of years I think its <30% SOC now.
- Jul 07 2018 2:27am
- Forum: Battery Technology
- Topic: Chinese VTC6 Clones are confusing the crap out of me please help.
- Replies: 5
- Views: 651
Re: Chinese VTC6 Clones are confusing the crap out of me please help.
VTC6 clones? Why are you buying clones?
- Jun 13 2018 10:35pm
- Forum: Large EV General Discussion
- Topic: A simple but practical and cheap EV range extender?
- Replies: 21
- Views: 4802
Re: A simple but practical and cheap EV range extender?
Completely incorrect just as I originally guessed. Just took a clamp meter and tested the car under various load conditions. It draws 25A upon startup (when some pump is running, presumably some hydraulic pump for breaks/power steering). Then settles down to around 20A with headlights on. This is c...
- May 18 2018 4:49am
- Forum: Large EV General Discussion
- Topic: A simple but practical and cheap EV range extender?
- Replies: 21
- Views: 4802
Re: A simple but practical and cheap EV range extender?
Sorry, you are not making sense, and I believe you are incorrect. DC/DC converter literally dumps power to the 12V + and - terminals of the battery. These same 12v battery + and - connections have cables to the cars chassis which then powers accessories. Right. So if you measure power to/from the b...
- May 11 2018 3:48am
- Forum: Large EV General Discussion
- Topic: A simple but practical and cheap EV range extender?
- Replies: 21
- Views: 4802
Re: A simple but practical and cheap EV range extender?
That doesn't make sense to me, unless there is a bypass that allows power to flow from the DC/DC directly to the accessories and not through the battery. The battery is not an energy source, and no power flows "through" it. In a hybrid it only provides power to start the car (and power fo...
- May 09 2018 10:24pm
- Forum: Large EV General Discussion
- Topic: A simple but practical and cheap EV range extender?
- Replies: 21
- Views: 4802
Re: A simple but practical and cheap EV range extender?
I might try connecting my DC clamp meter to the 12V battery cable so I can see what kind of power that puppy is supplying with the AC and heat on etc. You have to put the clamp on the output of the DC/DC not the battery. Why? The fans, lights, radio are all drawing power through the battery which i...
- May 09 2018 10:20pm
- Forum: Battery Technology
- Topic: Tool battery for extra range
- Replies: 22
- Views: 3518
Re: Tool battery for extra range
Regarding low voltage protection, that would only work on batteries where the power flows through mofets. What I'm seeing in many newer batteries is they don't send the power through mosfets (this increases resistance and voltage loss) but instead rely on the tool to sense when the battery is low an...
- May 09 2018 10:12pm
- Forum: Large EV General Discussion
- Topic: Finally, Your Next Car Could Be A 3D-Printed Electric Car
- Replies: 1
- Views: 1246
Re: Finally, Your Next Car Could Be A 3D-Printed Electric Car
70Kmph max speed. Couldn't take it on the highway. If it was highway legal and was $7500 it would be a free car for those in the US, because there is a $7500 federal rebate on Electric cars lol
- May 09 2018 9:56pm
- Forum: Large EV General Discussion
- Topic: A simple but practical and cheap EV range extender?
- Replies: 21
- Views: 4802
Re: A simple but practical and cheap EV range extender?
The 12V is used to power 12V items. Not major power loads. So it powers fans and electronics. The biggest load is probably headlights. For example on the A/C the compressor motor runs on the mail traction battery at 400V or whatever, but the controls and air-moving fans will power on 12V. The best ...
- May 09 2018 9:53pm
- Forum: Large EV General Discussion
- Topic: A simple but practical and cheap EV range extender?
- Replies: 21
- Views: 4802
Re: A simple but practical and cheap EV range extender?
I might try connecting my DC clamp meter to the 12V battery cable so I can see what kind of power that puppy is supplying with the AC and heat on etc. You have to put the clamp on the output of the DC/DC not the battery. Why? The fans, lights, radio are all drawing power through the battery which i...
- May 09 2018 2:35am
- Forum: Large EV General Discussion
- Topic: A simple but practical and cheap EV range extender?
- Replies: 21
- Views: 4802
Re: A simple but practical and cheap EV range extender?
5Kw could be ~500x 18650's which would be sub 25KG just for the cells or around 55lbs. I might try connecting my DC clamp meter to the 12V battery cable so I can see what kind of power that puppy is supplying with the AC and heat on etc. I believe the real killer of the battery is the liquid chilled...
- May 08 2018 5:47pm
- Forum: Large EV General Discussion
- Topic: A simple but practical and cheap EV range extender?
- Replies: 21
- Views: 4802
A simple but practical and cheap EV range extender?
So all production EV's I'm aware of use a 12V flooded lead acid battery which is charged by a DC to DC converter off the main Li-ion pack. This 12v battery powers lights, fans, accessories, and other car electronics. Some articles I read suggested that it may even be powering the heating and cooling...
- May 08 2018 5:34pm
- Forum: Battery Technology
- Topic: 17Ah GA pack shuts down after 2.5Ah
- Replies: 3
- Views: 396
Re: 17Ah GA pack shuts down after 2.5Ah
Need more information. What is the BMS cutoff voltage? What temperature? What is your average current consumption?
- May 08 2018 5:33pm
- Forum: Battery Technology
- Topic: New battery pack build.....25R, 30Q or VTC6?
- Replies: 24
- Views: 8497
Re: New battery pack build.....25R, 30Q or VTC6?
I'd say make sure the cell continuous amp rating is at least double your actual continuous amp draw, or your pack will have a very short cycle life of maybe only 100-150 cycles if pushed to their limit. Also consider the Sanyo NSX. I prefer it over the 25R, its a bit more expensive, but has lower re...
- Apr 30 2018 5:05am
- Forum: Battery Technology
- Topic: Highest capacity 18650 cells
- Replies: 68
- Views: 10617
Re: Highest capacity 18650 cells
LG M36 is the highest capacity readily available 18650 on the market. 3600mAh, 10A rated.
Sanyo GA, Samsung 35W, LG MJ1 are all 3500mAh and are close.
Sanyo GA, Samsung 35W, LG MJ1 are all 3500mAh and are close.
- Mar 14 2018 5:33am
- Forum: Battery Technology
- Topic: battery life @ supercharging dependent of heat - Discussion
- Replies: 2
- Views: 417
Re: battery life @ supercharging dependent of heat - Discussion
Any battery will prefer to spend its life at 25'C. Charging at 2C is no different to discharging at 2C - the heat is mainly coming from I^2R losses in the current collectors. The degradation is quicker at high states of charge too - more reactive species present. I agree, the heat dissipated will b...
- Jan 10 2018 5:44pm
- Forum: Battery Technology
- Topic: Given 80 90 100 % what is the sweet spot?
- Replies: 13
- Views: 1486
Re: Given 80 90 100 % what is the sweet spot?
I agree, it depends on your needs. The military often charges their long life Li-ion batteries to 3.92v per cell, which is around a 70% SOC providing much longer cycle life, and basically eliminating the CV stage of charging. NASA in some applications in space has used 20-30% DOD and achieved 10's o...