Search found 339 matches

by BVH
May 30 2020 9:49am
Forum: Items Wanted
Topic: Prodecotech 51.2V/12 Ah LiFeP04 battery - Looking to buy a good or bad one
Replies: 13
Views: 1753

Re: Prodecotech 51.2V/12 Ah LiFeP04 battery - Looking to buy a good or bad one

As the title says, If someone has a good or bad 51.2V, 16S/12 Ah LiFeP04 Prodecotech pack they would sell, I'd be interested in it. They've gone out of business as I understand it. My two are functioning fine but I'd like to prepare to rebuild them as they are 6 years old and I don't want to open on...
by BVH
May 29 2020 10:39am
Forum: Items Wanted
Topic: 10s Hobby charger that works
Replies: 5
Views: 215

Re: 10s Hobby charger that works

And the iCharger 4010
by BVH
May 27 2020 1:47pm
Forum: E-Bike Technical
Topic: Bike Throttle Replacement Search
Replies: 7
Views: 245

Re: Bike Throttle Replacement Search

Timing is everything! I just sent off a bunch of free stuff to member John61ct and I'm pretty sure my old, fully functional Prodecotech thumb throttle with 3-light battery status leds was in the box as I can't find it here and it's not in the trash. You might PM him to see if he has it and will send...
by BVH
May 19 2020 6:11pm
Forum: Battery Technology
Topic: What should I set min discharge voltage for NCR1860GA 14S battery?
Replies: 10
Views: 182

Re: What should I set min discharge voltage for NCR1860GA 14S battery?

42 Volts LVC is 3.0 Volts per cell under load. Should be safe as pack will rebound to maybe 3.2 or 3.3 Volts Per Cell at rest depending on how much of a load you are placing on the cells at the time of LVC. But if it were me, I'd use 44 Volts to be kinder to the cells as long as you're getting the r...
by BVH
May 19 2020 1:23pm
Forum: Items for Sale - Used
Topic: *CLAIMED No Longer Available* New LiFeP04 16S Chargers (2), Barely Used Lyen Controller & Shimano 13-34T Freewheel
Replies: 2
Views: 139

*CLAIMED No Longer Available* New LiFeP04 16S Chargers (2), Barely Used Lyen Controller & Shimano 13-34T Freewheel

Claimed! No longer available. Cleaning out my bike cupboard and I can't bear to toss them in the trash so this entire Lot is almost Free - just pay Large Flat Rate Box USPS shipping cost to any of the 50 States. I don't want to split it up so please don't ask for separate items. If you don't want e...
by BVH
May 14 2020 6:32pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1145
Views: 158103

Re: kWeld - "Next level" DIY battery spot welder

Here's a mock up of how I balance charge the 2P pack. Not shown, but obvious are the balance board input cables and balance cable which are connected to my FMA Dual PowerLab 8 . https://hosting.photobucket.com/images/y79/BVH/KWeld_batt_charge_setup.jpg?width=1920&height=1080&fit=bounds It may look a...
by BVH
May 14 2020 9:41am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1145
Views: 158103

Re: kWeld - "Next level" DIY battery spot welder

I use the 120 Amp rated Anderson connectors and feed both Negs and Pos into one connector for each pair. Matching connector is on KWeld.

Image
by BVH
May 10 2020 1:09pm
Forum: Battery Technology
Topic: Parallel yes or no
Replies: 5
Views: 198

Re: Parallel yes or no

I added a second, identical battery to my Prodecotech Oasis for longer range with the added benefit of reduced Voltage drop at a given current flow. They are separately key-switched, BMS'd and I charge them separately. After charge, i allow them to reach a differential of about .2 to .3 Volts before...
by BVH
Apr 28 2020 1:50pm
Forum: Battery Technology
Topic: Queen Battery QB26650-2300 LiFePO4 cell's test + comparison with A123 Systems ANR26650M1B
Replies: 9
Views: 664

Re: Queen Battery QB26650-2300 LiFePO4 cell's test + comparison with A123 Systems ANR26650M1B

OP, let me know if I should delete this and start a thread. Would members be interested in buying small quantities of the 3600 mAh cells if I bring in the min order quantity which will be many more than I need? No markup, just the per cell cost inclu shipping I will have paid plus actual shipping to...
by BVH
Apr 28 2020 11:10am
Forum: Battery Technology
Topic: Queen Battery QB26650-2300 LiFePO4 cell's test + comparison with A123 Systems ANR26650M1B
Replies: 9
Views: 664

Re: Queen Battery QB26650-2300 LiFePO4 cell's test + comparison with A123 Systems ANR26650M1B

I'd be interested in some of the 3600 mAh cells. Would like to see some test results.
by BVH
Apr 28 2020 10:31am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1145
Views: 158103

Re: kWeld - "Next level" DIY battery spot welder

To reduce the heating up of the battery, parallel a second, identical battery when welding. You can also aim a small fan at the pack when working. It won't help cable heating though. When a Lipo is at 3.7 Volts per cell - resting, not under load, it is down to about 18-20% capacity remaining. Best n...
by BVH
Apr 23 2020 10:51am
Forum: Battery Technology
Topic: Luna Charger dead after 10 uses.
Replies: 25
Views: 631

Re: Luna Charger dead after 10 uses.

Hi Mac. Long time, no see over at CPF. I still have my Green body'd, Quad Cyan that I got from you years ago and it's still the best looking light I have.
by BVH
Apr 23 2020 10:44am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1145
Views: 158103

Re: kWeld - "Next level" DIY battery spot welder

It might trigger overcurrent if you run them in Parallel while calibrating the unit as my 2 Panthers in Parallel did. So calibrate with one, weld with 2. That's what I do with zero problems. This was suggested to me by the builder of the KWeld some time ago.
by BVH
Apr 23 2020 10:05am
Forum: Battery Technology
Topic: Battery welding issues
Replies: 5
Views: 322

Re: Battery welding issues

I had a Sunko and was very disappointed in it's performance. After looking at the JP and KWeld here on ES, I went with the KWeld and am extremely happy with it. After the first use of the KWeld, I decided that the Sunko's are junk.
by BVH
Apr 23 2020 9:59am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1145
Views: 158103

Re: kWeld - "Next level" DIY battery spot welder

The 90C on the label is a complete lie. The absolute best Lipos available are the Graphenes and some of those will do a sustained 40-45C. After that, inter-cell and connector solder joints begin to melt. You will be lucky to get about 25 to 30C out of it. Buy a second one and run in Parallel and you...
by BVH
Apr 20 2020 11:38am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1145
Views: 158103

Re: kWeld - "Next level" DIY battery spot welder

Yes, I've used one and it works fine. I'm just trying to be "nice" to the batteries by sharing the load.
by BVH
Apr 20 2020 10:17am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1145
Views: 158103

Re: kWeld - "Next level" DIY battery spot welder

I use two of the exact above Panthers in parallel when welding but calibrate using only one as two causes an over-current issue when calibrating.
by BVH
Apr 12 2020 10:27am
Forum: E-Bike Technical
Topic: What am i doing wrong? Help please
Replies: 19
Views: 465

Re: What am i doing wrong? Help please

Comparing identical Amp hour battery packs of different nominal Voltages is an oranges to apples capacity comparison. Watt hours is the great equalizer.
by BVH
Apr 11 2020 11:38pm
Forum: E-Bike Technical
Topic: What am i doing wrong? Help please
Replies: 19
Views: 465

Re: What am i doing wrong? Help please

Do you have a gps device - a cycling computer or other device that will give you a speed reading? I use "Speedometer" on my Android phone.
by BVH
Apr 09 2020 12:54pm
Forum: E-Bike Technical
Topic: What am i doing wrong? Help please
Replies: 19
Views: 465

Re: What am i doing wrong? Help please

You've only got 185 Watt hours of capacity and you can use only about 80% of that safely so you're down to 148 Watt Hours usable capacity. If you're steadily feeding 500 Watts into your motor, you would use up that 148 Watt hours in about 18 minutes. Do you know how many Watts you're feeding the mot...
by BVH
Apr 06 2020 3:45pm
Forum: E-Bike Technical
Topic: What am i doing wrong? Help please
Replies: 19
Views: 465

Re: What am i doing wrong? Help please

If your cutoff is occurring at 3.6 per cell under load and then ending up at 3.8 per cell resting, trying lowering the cutoff by .1 Volt per cell and you will get a bit more run time and hopefully end up with a resting volts per cell of 3.7. YOu could probably go even lower to a cut off of 3.4 and e...