Endless Sphere

The lithium chemistry and electrode are important factor imho. Lithium titanate can be charge very quickly and has incredible cycle life. Lithium iron nanophosphate cells from A123 probably have a decently high charge rate. Otherwise... NMC high discharge cells can probably take a pretty decent char...

i think we can both agree that almost nobody -not even mechanics- are spending 500+ on a ammeter unless you are doing specialized stuff. that is well outside the range of what any consumer would spend and also not even many regular elechickens would buy. and most ammeters ( up to prosumer grade) si...

If your really want so see the amperage spike, can be done with an ameter shunt and an oscilloscope. The shunt will read voltage drop a across it' s terminals that will be proportionnal to the current (for example : 50mV for 100A). Then the oscilloscope can graph the current surge in function of tim...

Merry Christmas y'all !

Matador

I don't know what's the amperage load of the starter during cranking, but most car battery load tester have a 100A load resistor at 12V... And for a 600 CCA battery, if the voltage doesn't drop below 10.4V, seems like the battery is in good shape. Mine only dropped to 11.01V so I think I'm good to g...

Update: Battery rescue mission is a success: eGWQqUe0IxU DESCRIPTION OF YOUTUBE VIDEO Car: 2008 Subary Impreza 2.5i 5Dr Battery: Exide Global Extreme 35X (100RH, 58 Ah@0.01C discharge, 42Ah@25A discharge, 585CCA, 700CA, Manufacture date Nov 2016) This test: Dec 25 2019. Battery had slowly discharged...

Starting your car just to maintain your battery seems unwise, expecially if the car doesn't get fully warmed up. Modern cars' computers draw enough current to justify a maintainer charger if you aren't using the car daily. If you can't plug in, attach a 'booster' battery that you can easily bring i...

sure, you can disconnect it, and keep it on the maintainer. But then the car computer resets every time, and it runs shitty for a few miles each drive. Just what you need in really cold weather. Yeah, this will work, till it leaves you stranded someplace, and its below zero. I get it that a new one...

OK, sorry, to add to the detail... When connected to the charger (Turnigy Reaktor) , at either 12v (6s pb), or 10v (5s pb), the charger checks ok and attempts to charge for 10 secs or so. But no amps flow and the charger builds the voltage up to 13.8v before shutting off on. “Full charge”. Also, wh...

Thank you all for all the inputs. Will try to crank my car this week end and give you an update then. Right now battery seems pretty good. Left it rest for 12 hours unplugged and still reading 13.22V (there is hope). Putting it back onto the maintainer charger until this week-end and we'll see how i...

Thanks for the input!
Also tried the Battery resistance function of the Imax B6 charger... Said battery was 20 millioms.

Don't use my subary impreza much these days. On september 1st 2019, did a 1000 miles round trip and by then my ammeter showed close to 0 amps (battery fully charged, no current going in). Since then, I only started my car once every one or two week and went for a 15-20 minute ride so the alternator ...

Probably will handle it fine. But if you want to be sure google de mosfet number and find the component PDF datasheet to find its voltage

I think you can find the answer in that post I started on Calendar Aging of lithium cells: https://endless-sphere.com/forums/viewtopic.php?f=14&t=86777&p=1269133&hilit=calendar+life+matador#p1269133 Look at the graph of LFP chemistry. Calendar aging is dependant on storage state of charge (SOC) and ...

I would open the controller and look at the capacitor ratings.
If they are rated 63 V max, you could try running it at 48V (13S) or even 52V (14S)....
You'd likely gain 30% top speed, but acceleration will remain the same.

If the caps are 50V rated, don't risk it though.

Matador

Don't drop a metal wrench in that trunk with the battery inside... :shock: :warn: :flame: :kff: Your build reminds me my first solderless battery attemps with plexiglass, copper bussbars, brass nuts and bolts and contact springs: https://endless-sphere.com/forums/viewtopic.php?f=31&t=87434&start=25#...

The solution to all this is to buy a bike lock made of materiel much tougher than disk grinders... Very high hardness ratio. Basically buy a lock made of diamond carbon.

Exactly. You got this right. Of course if your against long working time and an angle grinder an multiple battery back for that portable angle grinding, and grinding disks nothing can resist... You could grind into a bank safe if you were so inclined. The goal is to deter theives... A pro thieve who...

Does anyone know the BBSHD crank arm bolt thread pitch and count? It would probably be easy to build temper proof screws yourself using metal rods and a die to make screw threads. PS: i got the idea of epoxying ball bearing in hex screw holes from the advices of Hal Ruzal, a well known dude from Bi...

Maybe epoxy some ball bearings in the allen screw holes so no stealer can remove it

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[/quote] In fact most of informations about cell life which you find on internet are only "old wives' advice" based on rules which actually did not works in significant amount of cases :? Many people forget when evaluating cell EOL, that there are two major conditions. Capacity fade and DCIR rise, w...

A 17A controller probably delivers 8A continuous. A 20A controller probably 10A. Upping to 48V... That's 380W and 480W of power continous... But 800W to 960W burst... I would do it... Your original conttoller on the 250W probably already had burst power of 540W... Should survive no prob. Just dont g...

My guess is this is for a PAS cadence sensor, which you probably don't need on an e-Scooter anyways.

Try Bestech power website