Recent content by ASK1

That's a good point. I should do the math on this. I haven't purchased any of these systems yet, but a fair number of users have reported that they can feel their wheels wobbling/shimmying from the imbalance. Also this has the effect of limiting the pack size because larger pack sizes will...

So I haven't done the math on that yet. Some of the more popular wheel lights on the market use 2-3 AA batteries. I'm not sure if they are running in series or in parallel. In series that's 3.0-4.5 V, capacity of 2.5 Ah (7.5-11.3 Wh). In parallel that's 1.5 V, capacity of 5-7.5 Ah (also...

Are there any batteries on the market that would be able to wrap 360 degrees around a cylinder? Or for that matter, any fairly thin batteries that could comply to a curved surface without being damaged? Can any sufficiently thin LiPo cell do this, or do they have to be specifically designed for...

So I wired it up as pictured - I am able to pull power to drive the load (my ebike motor) no problem, but when I try to charge the pack, my charger is not working. I tried removing the load from the parallel (so it is just the charger hooked up to the battery+BMS), and still the same result, no...

Hi guys, just wanted to double-check before I wire this up - does this look correct? Does the load really go in parallel with the charger? Meaning that all of this can be left connected while the battery charges, and there is no need to disconnect the load? Thanks.

I've been monitoring the pack voltage and it has stayed constant since I built it... I'm probably going to proceed with wiring it up to my bike tonight. Edit: Successful first ebike build (for now) and ride! :) Now I need to figure out how to wire the charger tomorrow (maybe after I figure...

Sorry that was a pretty vague/dumb question of mine. I checked the wiring diagram for the BMS, and I now understand how it is wired, but I think I have a problem - my 13S BMS has only 13 balance wires whereas its wiring drawing indicates 14. And any BMS should have N+1 balance wires (where N is...

Cool. Went ahead and did that. I'm going to go ahead and make all the series connections next. Do I need to be careful about how I connect my BMS? I'm going to do that after everything is connected in series.

Hi guys, I've assembled my parallel groups of 18650s and am about to connect them in series (with redundant series connections). Do you think any kind of padding material between cells is needed, or is it okay to have them in a tight staggered configuration? I intend to go easy on these cells...

This is how I'm going to lay the pack out, if I proceed with soldering. Both series tabs and parallel rails will be tinned copper braid.

Hey DrkAngel, After attempting this, I realized I have questions about the process: Are both the solder bead on the cell and the solder bead on the braid facing up? Meaning that they do not touch? And you are pressing the solder iron onto the solder pre-applied to the braid, which then in turn...

I would use solder in a heartbeat if I didn't think the heat would damage the cells. That would be a much better build. But how do I do it without frying my cells?

Those pictures were taken by me - that's how I did it. It's just cut up 35 mm bike tube for the bands, and duct tape to hold the bands in place. Also, what sort of magnets? Neodynium? Cool solution but may be quite pricey (or unpredictable? I'd be worried about them causing havoc)

Hey DrkAngel - I like your idea, I think I do just need some kind of bridging material like you described. The batteries have a protrusion the positive end, and that end seems fine, but the negative is slightly concave with the green outer wrapping and that is the side I'm concerned about - so I...

Hey guys. I posted about my proposed build back in May, and got very sidetracked and never started on it. Well, I've finally started. I put together my first parallel group and... well, I'm questioning my whole design altogether. I'm not sure if there is enough compressive force from the rubber...