eBikes?

[st3v3]

Just to be clear - electrics aren't remotely my thing.
Outside of twisting 2 wires together or crimping a spade connector up i'm useless.

There's definitely no way i'm understanding the scale and differences on the outputs, wattages, voltages and how they all combine or not - i'm not an entire thicko but I have a numbers form of dyslexia, my brain just can't calculate arithmetic.

This aside I rely on eBikes for work, and a chat last week got me all confused; talking about range and recharge times.
My takeaway was that was we're mostly limited today on plug-in-the-wall charger capacity, something about 2aH? or 2 something anyways, which makes an 8aH battery pack take 4 hours to recharge.

I need a workshop explanation (or at least something more refined than a week long pointless google investigation) as to why we're limited to such a trickle charge situation when the whole world is having a dramatic shift in both energy supply and EV usage?

Comparative e.g?; my Samsung Galaxy phone can fast charge, but my bike battery can't?
...could someone dumb it down for me?..
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Roger wrote: Women don't get damp for clingy puppies. Get some better happy pills, hit the gym & buy a medallion the size of a dinner plate. Job done

[jaffa90]

A 4 hour recharge sounds ok and safe so why not buy a spare battery?

[jeffyjeff]

Batteries are electrochemical devices; they operate on the principle that a chemical reaction between dissimilar elements in the battery causes a migration of electrons to one of the battery terminals (and a corresponding deficiency of electrons at the opposite terminal). With rechargable batteries, that process is reversible. Force electrons backwards through the battery (with a higher, "charging" voltage), and the chemical reaction reverses. The battery is fully charged when the dissimilar elements in the battery are fully transformed to their original state. The cycle of discharge and charge occurs many times over the life of the battery. Unfortunately, the chemical reaction releases heat. The manufacturer has determined that 2 Amp/Hours is the fastest charging rate that the battery can support. Charge the battery too fast, or discharge the battery too quickly, and it will overheat.

Many instances in the news in recent years of battery caused fires. Hoverboards and the Boeing 787 Dreamliner come immediately to mind.
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History shows again and again how nature points out the folly of men - BOC

[weasley]

Yep. Batteries charge and discharge at their best within a window of temperature. I’d they are too warm they can overheat at the extreme but even a mildly high temperature will mean inefficient charging and a reduction of long term battery life. To help with very fast charging future cars will have batteries with direct cooling circuits through them as well as cooled charging cables.
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Yamaha XJ600 | Yamaha YZF600R Thundercat | KTM 990 SMT | BMW F900XR TE

[Easy-X]

Limiting factors:

* Manufacturers specify a maximum charging current for their batteries.
* Low current "trickle chargers" are much cheaper than high current "smart chargers."
* Fast charging lithium ion batteries reduces their capacity over time, i.e. they wear out quicker.
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Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[st3v3]

[st3v3]

[jeffyjeff]

[Robby]

The limitation is the bikes and their chargers. Likely because they are using cheap components.

If they were using expensive components, you could charge them up in under an hour. There's enough power available at the plug to charge an electric motorcycle with a much larger battery in 4 hours.

eBikes still seem to fall into the "shit and expensive" category.

[Easy-X]

To give you an idea the typical 18650s I use in eBike batteries are rated at ~3Ah capacity per cell, trickle charge of 1.5A and fast charge of 4A. So that equates to (at best) 2 hours for a slow charge and 45 mins for a fast charge.
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Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter