My friend has a coworker whose ebike has stopped working.
The main problem she said is when she used to plug it in the charger light would stay red but now it is green
and doesn't appear to charge. It no longer starts. The poor girl has no other transportation so we are trying to
help. How would you go about diagnosing this?

This is when I plug in my other charger and it usually works. Chargers do fail.

Lacking a spare, put a voltmeter on the charge output. For a 48V battery, it will be 54.6V, For a 36V battery, it will be 42.0V.

Then put the meter on the battery output. Again, a 36V battery is normally between 30-42V. A 48V battery is 40-54.6V. If you read less, it's a battery issue.

Usually on these bikes, the battery got old and wore out, They sell spares for Jetsons. Might be better to loan her a regular bike if you have a spare. Jetsons only have a short range. If it;s less than 6 miles, she could ride a regular bike.

Above nailed it. A voltmeter is less that $20 at Amazon (or many other places.

Probably, the battery is dead, not the charger, but if one has a spare charger, it’s something to try before spending money.

Jetsons are the cheapest of the cheap, and certainly use the cheapest cells that are safe. Once a cell fails, it takes out the whole cluster, the battery’s protection system detects it and throws the signal that the battery’s no good.

Fixing the battery isn’t generally doable, as the cells are welded in place; one needs special tools.

Time for your friend to invest in a new battery or a good muggle bike.

I checked the charger and it gave me 42v. Where would I find the battery output?
Ordered a new charger just in case. Good suggestion going to go check if I even have a bike in the garage she can use.

Thanks working on checking the battery now

Hooked a new charger up lit red then went right to green.
Is this a sign the battery is dead?
Any idea how much one costs and how hard it is to replace?
Thanks for your help.

This eliminates the charger.

So either the battery is bad or the controller on the bike is bad.

You can check the battery with a voltmeter, if you have one and know how to use it. Turn it to DC volts (the symbol for DC is a solid bar over a dotted bar) and check each combination of battery terminals. Do any of them read somewhere around 40 V? If not, the battery's toast and that points to the bike's controller being faulty.

Tha'nks for all the help. How do i get to the battery terminals?
Everything seems to run into the bike frame from the battery.
Do i need to remove the battery cover?
It is so hard to find schematics for the wiring seems jetson won't release it.
Did right to repair ever get passed?

Look at the Jetson forum (Randy Rides) in electricbikereview; an individual replaced the components on his bike (including the battery). It appears as though he just removed the side cover to access the battery,then "spliced" in another one because in this case he wanted a top speed of 30 mph.

is it electricbike or is it electricbikereview. even searched randy rides and couldn't find.
or is this on the jetson site?

"electric bike review", then go to the (sub) forum for individual companies, then go to Jetson.

thanks again

for the life of me i can't find anything that says electric bike reviews or jetson other
than the forum I am typing in.

I can see why you're having trouble. TRY electricbikereview (notice one word and no S). Then ebike forums. Then Discussion by brand and user reviews.

It's best to put a link or photo to the bike in question, I suppose it's this bike? The case will have screws that hold it together. Inside, you'll find a controller ( a silver box with wires) and a battery. Do not know what the battery looks like. The photo shows what it might be,

Just work carefully when you open up the case. Keep the fasteners somewhere where you won't lose them or step on the bottle/box that you put them inside. Take photos of wiring, in case there is any question of what goes where.

At least post a picture here of the battery when you see it, so that there is somewhere on the internet that shows a photo of the darn thing,

As for the battery, It will probably be a rectangular brick with two pairs of wires, similar to the picture. One pair will be heavier duty, and have a large yellow connector. This is the main power line, The connector pulls apart, and you can check the terminals for voltage. The other pair will go to the charger input of the case



The batteries are pretty simple in these bikes. If it were not for product safety considerations, almost any 36V lithium battery of similar size will work. If you have a vendor you trust, easily replaced.

That is it. Today i was out there looking at it with a flashlight and saw out of the 6 screws on the battery 3 were missing
so I opened it. Someone had been in there before. I need to get a pic but there were dang yellow sticky notes labelinlg
the wires. This has been a mess because she told me she bought it used and then a friend worked on it. I'll try to get
some pics this weekend just incase anyone else needs them.

electricbikereview dot com
it's another website. Got it now.
Thanks again

I just saw this on YouTube: YouTruther put a different battery than stock into a Jetson Pro; this short video might assist you.

I have logged out and logged back and reloaded the page numerous times.
Any suggestions?
I tried doing one pic at a time and same error.
Just figured the pics might help someone.
Whoever had this before did not know how to solder. Wires cut and all over the place.
Battery is at about 20 or 2 volts and figure it's the bat or controller not something I can fix.

From the pictures it looks like this was worked on 2 or 3 times by someone or different people.
The negative wire to the battery has awful soldering. The throttle was replaced. Some lines
are labeled but it's basically a mess in there. Maybe if it was all original, I'd risk trying
to replace the battery but it's such a mess.

That reminds me of the old saying for poker players: "Don't throw good money after bad". An individual who had delved into the hearts of these systems might toss the rat's nest and battery, then graft a battery (perhaps plus controller) and get the thing working.

Thank you will look that up. Maybe it will look easier than I am guessing

LOL rats nest. Sure does look like that.
Looks like such a hassle. I'll check that video and
see if I can help that lady out without getting myself
too annoyed.

Oh wow. Looks like someone peeled the shrinkwrap off that battery, and ran the bike without it, exposing the cells to potential short circuits, and the BMS control board to the world. Very dangerous.

One could replace the throttle wiring with properly soldered/shrink wrapped cable, but I do see a couple of hanging JST connectors there,

There is the one trick of plugging in the charger and see if the bike powers up and spins the motor with wheels off ground, That will tell if the controller and its wires are working, maybe.