The Brain Dump

P5 is the customizing parameter for the battery gauge.  It is described as a limiter to reduce excessive fluctuations in the meter during throttle use but it is also used to determine when the display should show the relative depletion of the battery. I personally want 1 bar (value of U in formula below) to tell me that the battery is close to dead because some semblance of actual battery voltage would be nice to know when I'm 15 miles from home. The KT LCDs are supposed to detect battery voltage and determine the base voltage of the pack but at certain voltages, it's possible that it can get confused and think it's seeing a fully charged 36v pack when it's really a nearly depleted 48V or 52V pack. Leaving P5 at 0 just leaves the meter reading at the mercy of the display logic and will probably be OK over time if it can figure out and remember  the pack's voltage. There is a formula that can be used to configure P5 and it incorporates the low voltage configuration i

  Used Battery description My first eBike battery pack used brand new cells that I purchased for $2.75 each (EVE 25P). They were marked as 2500 mAh batteries and tested at 2200mAh. I thought it was a pretty good deal until I came across bulk modem batteries that are being sold for about 75 cents per cell (Samsung 26F) and the cells I have measured so far are showing capacity ratings between 2200 and 2500mAh.  They appear to be a far better deal than my brand new batteries.  I purchased 40 packs to get 80 cells and so far only 2 were not useable and 3 with capacity below 2000mAh.  I liked the value so much that I bought an additional 20 packs before they sold out. Used Modem batteries delivered I figure the additional cells will allow me to build longer range batteries or higher voltage batteries. The 2 upcoming retrofits that I will be working on will be for my son who needs a higher voltage bike to get him up the steep hills where he lives but not necessarily longer riding distances a

I picked up a battery meter to test some batteries I purchased as well as some that I'm planning to repurpose. My initial reason for purchasing was to determine if the capacity of the batteries that I'm purchasing and shipping on a slow boat from China (3 months!!!) to know if the capacity of the batteries match the labeled capacity. This is important in order to understand what the battery pack will be rated in terms of amp hours. Update: Looks like that battery shipment disappeared and I will have to dispute the charges on that purchase. My 2nd shipping problem from AliExpress will more than likely make me avoid using them forever. The issue I have is not the frequency of failures (already high at 25%) but the length of time I need to wait before the shipment failure is confirmed (up to 3 months) My type c battery meter with 3d printed cover The other thing my attention deficit addled mind decided would be a great idea is to reclaim old laptop batteries to make flashlight upg

I purchased a decent inexpensive "Nashbar Flat Bar Road Bike" ~$230 from Bike Nashbar back in April 2017 and rode it twice over the next 2 or 3 years. Life got in the way, I became even more sedentary.  With just a few months to go before I retire, I decided it was time to get back on the bike and spend my days being active walking and biking. Thinking that an eBike could help me up the hills, I figured I could probably get some more seat time for more exercise.  I found this reasonably priced kit on Walmart.com to convert my regular hybrid bike to an ebike for as little money as possible.  A new project with new stuff to learn will be a good time.   After looking at tons of options on Amazon and Walmart and trying to figure out if I should purchase a 48v or 36v motor, I decided to go small for my first project because lower voltage would mean fewer batteries, lighter weight and lower overall cost. I didn't want a front wheel drive bike though it might be slightly easier