Recent content by coffeemaker

It's been on the back of my mind for a while, but I've been quite busy lately. If I have any updates, I'll be sure to post them here.

Thanks for sharing. Did you try restoring the battery contacts? ie does the BMS permanently trigger over-discharge protection and brick the battery pack?

I have the Electrak 2.0 Armadillo 700x51 on the rear because if its very good puncture resistance. Very tight clearances and had to true the wheel to prevent it from rubbing against the seat stay and chain stays.

Thanks. This project is affected by the chip shortage as well, so it's quite tricky to get parts (TPS92692/TPS92691). Will post updates here, stay tuned.

This charger will plug directly into the Creo, since it's the same among the Creo, Vado SL, Levo SL models. It'll be slightly bigger than the red plug of the Specialized charger. The power input to this charger module will be a USB-C PD enabled charging brick, such as a MacBook USB-C adapter.

Sorry, I've been busy for some time. I've been in touch with geeksville, who has graciously volunteered to work on the firmware side of this project. Will provide updates, and hope to see it finalize in the next few months. No plans for Kickstarter due to lack of demand. This seems to be a niche...

That'd be amazing, thanks for the offer. To give you a better idea of the HW, here's what I'm planning on doing: The MCU is an ESP8266 for info display and control over WiFi. Haven't decided if we'd like the ESP to act as an WiFi AP or have the ESP connect to an existing AP. Monitor pack...

You're correct that li-ion batteries need to be treated with respect. Operating or storing them out of spec (under or over voltage, overcurrent, over or under temperature) can cause serious issues. The USB-C adapter will have safety features that takes this into account.

I don't have a range extender or a Y-cable so I'm not sure. May be an oversight or a technical limitation, although I can't think of any off the top of my head. In your experience, what's the charging order? Main battery then the range extender, or simultaneously? Do they charge simultaneously...

Slightly slower at 100W compared to the original charger's 163.8W. USB PD 3.1 allows up to 240W, but no chargers support it yet so I'm planning to stick to 100W max. If 240W USB-C adapters come out in a few years, I may update the design. For the charge control logic, I believe the charger...

I'm working on the PCB design. While it's sent off to a fab, I'll be working on the code for the MCU.

Thanks. I may need some more interest to get a range extender and test it. Here's a 90W USB-C PD charger and cable that you can use: https://www.amazon.com/Charger-Charging-Adapter-MacBook-Laptops/dp/B09PBK115P $30 or $24 with the promo coupon.

The Abus lock can be finnicky. I like to wiggle the key while turning clockwise all the way. Then tap the left side of the battery into the frame to release the battery.

Correct. The only affected part would be the hydraulic brakes. Should return to normal after several pumps in the normal orientation. That only applies to lead-acid batteries (car batteries) that have free flowing electrolyte. Li-ion cells do have a liquid electrolyte, but is not free flowing...

Hi folks, I'm working on an USB-C adapter that would allow the SL battery to be charged with a USB-C adapter, such as the one used for modern MacBooks. The original Specialized charger is $200 and is bulky. When I ride my bike to work or friend's house, there's a good chance there's already a...