Recent content by Robot_Exterminator

Maybe. Could also be that the cells haven't been far enough out of balance. It is a relatively new pack. (Also I don't see any indication that the BMS is powered off only two of the packs cells)

This theory makes sense and could be true, but I don't think my set up is behaving that way. I haven't fully "baby-sat" a charge cycle, I've had it running in the background, so I know the fan only runs when it's charging and it takes a few hours. Once the charger goes into standby mode, it...

No, I don't have the patients or motivation to do a full discharge at a constant rate, plus I don't have a way to measure the Ahr through-put

As the T-shirt says, I void warranties. Looks like the BMS in my particular Luna pack is the same one being sold here: https://m.aliexpress.com/item-desc/1206415913.html (assuming no modifications implemented by the pack maker) As mentioned, balance turn-on voltage is close to 4.2V. Seems with...

Agreed with all, in principle. However this charger is definitely not sophisticated enough to hold a Constant voltage charge. Once it gets to the hardware-controlled set point, it switches off. As a side note I think people are over obsessed with charging 18650s to 100%. Unless you really...

Hmm... I've been thinking about this and it doesn't quite make sense. Here's what I've come up with: The short answer is, it can't be that risky, if Luna sells an "80%" charger for their packs: http://lunacycle.com/batteries/chargers/luna-charger-52v-advanced-300w-ebike-charger/ The longer...

Huh. It had never occurred to me that the BMS trigger voltage would be that high, but thanks, that is good information. Even though there is a lot of tolerance built into the voltage divider circuit in the charger, the performance seems pretty stable and repeatable. I think I will install a...

This is how I modified a cheap charger to better suite my needs. Disclaimer: I DO not recommend doing this yourself. Also I won't dive too deep into the technical background, because Wikipedia. I ordered a BBSHD kit last month with a Luna 52V battery, and for $30 added the lowest cost, 3Amp...

Kenda Kiiniption Mountain Bike Tire, available in 26" x 2.3" about $25 per tire, light weight, high pressure, awesome for Urban riding. https://www.amazon.com/gp/product/B0026LJX4U/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1

My new pack runs up to about 54V but I'd like someday to see how the motor runs around 60. Looking at the motor and seeing how over-sized it is, even for the mower, I'm thinking Craftsman found a supplier that already had a part on the shelf. (The brushes on mine looked brand new, but the...

Third and final chapter: Now that the Razor scooter had a battery worth 4x the rest of the bike, I figured why stop the insanity? I had a bunch of LEDs laying around and an old 48V to 12V converter. For the headlight I added a heatsink, some lenses and a little water-proofing epoxy. I had...

After a winter of neglect, one of the four original 7AHr lead acid batteries had lost a cell and little scooter was only good for a couple trips up and down the street. I started thinking about building my own lithium pack, but didn't want to put too much money into a $100 project. It happened...

Time to start documenting a few EV projects sitting in my garage. I'll start with this one: The goal was to build an easy, cheap, electric pit bike (mission accomplished). Last year I picked up a non-running Razor Pocket Mod scooter of CL for about $20 (Or was it free? Who can remember)...

Slightly related- I'm in the middle of my own install, and I'm finding the M6 fasteners for the triangle bracket will not thread into the motor housing. I assume I will need to re-tap the motor housing. The fasteners included in the kit seem to be 6mm x 1mm... but does anyone know what size...