Questions tagged [battery]

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7 votes
3 answers
2k views

E-Bikes - Is it bad for the bike to run out of battery?

Today, I ran my e-bike out of battery for the first time. Interestingly enough, the bike didn't actually turn off, but automatically moved the mode from "Eco" (light pedal assist) to "Off" (no pedal ...
5 votes
4 answers
888 views

E-bike battery placement on the seat tube

when reading articles about location of battery placement on e-bikes, i don't seem to find seat tube being discussed anywhere. This is however exactly where Ecoride, a Swedish e-bike brand, places ...
4 votes
1 answer
126 views

How to replace and service Polar T-61 Heart Rate Monitor?

I have a Polar watch with a Heart Rate Monitor T61 that I haven't used in years. I followed the manual to connect the watch to the monitor, but it failed. I suspect the battery is empty. I see no easy ...
2 votes
2 answers
91 views

Finding a battery for an old e-bike

I have an old Raleigh stow e way folding bike e-bike but sadly the battery has died. I’ve tried to replace it but can only find used ones on eBay which might not last long. Battery is labelled: Li-ion ...
1 vote
0 answers
32 views

Choosing a battery for my motor/controller

I'll keep this concise. While I'm pretty overwhelmed with all the reading I've been doing, I believe I'm close to making a decision and need a sanity check on the following: I purchased a Bafang ...
1 vote
1 answer
77 views

1999 Giant Lafree Electrik, Only the diagnostic red light comes on. What is the problem?

When I turn the bike on, the five lights that indicate charge status flash red and then go out with only the red diagnostic light remaining lit. I ran the diagnostic checks and all items in the check ...
1 vote
4 answers
4k views

E-bike battery charger making horrible noises, only works certain outlets?

I had posted on endless sphere but since then I have possibly made a little discovery. Tldr; I have a fresh 48v battery and charger around less than 3 months old. Very intermittently when trying to ...
3 votes
4 answers
2k views

Why are there no/very-few bicycle-specific lights with replaceable 18650 Li-Ion batteries?

Most (higher end) battery-powered bicycle lights have built-in Li-Ion battery or a battery pack nowadays. There seem to be no front lights using replaceable 18650 cells. Rear lights with replaceable ...
2 votes
3 answers
268 views

Why did the manufacturer fit a usb port on my e-bike battery when it is not connected?

I have a Viking gravity e-bike with an internal frame battery pack which has a usb port included. Thing is, I found out that it wasn't working even though its a brand new bicycle. So I investigated ...
1 vote
0 answers
51 views

I need a battery for a Bulls Alpine Hawk bike that I bought used [closed]

I bought a Bulls bike and the battery would take an OK charge. After several months I charged the battery with the cables provided. I took a 15 mile ride and my average speed was 11mph. I'm now trying ...
1 vote
1 answer
1k views

eBike: use 48v motor with 36v controller and battery

On one DIY eBike I currently have a 36v 250w rear hub kit. It's a "cassette" version, not "freewheel". Problem is, the internal freewheel mecanism of the wheel is very damaged (...
1 vote
2 answers
94 views

Find replacement Electric bicycle battery lock / cylinder

I have a XEED E CITY electric bicycle and the company utilizes a simple wafer battery lock The lock itself comes from a company called TKM. I have lost my key and I would like to replace the whole ...
11 votes
4 answers
3k views

Does anyone make dummy batteries for eTap AXS derailleurs?

I just got a new Specialized Roubaix Expert with SRAM parts. I discovered that lengthy car rides drain the batteries because the derailleurs are triggered into activity by motion. Solution? Take the ...
0 votes
0 answers
213 views

Charging issues, carrera im2 bike

having charging issues with "wonderful" carrera impel 2 bike. New battery fitted, software up to date, new charger as well. When i connect charger it's showing me that its charging on ...
-2 votes
1 answer
124 views

Carrera impel IS1 scooter

customer brought in carrera impel IS1 scooter and its pretty new. Max speed should be 15.5mph at the moment it goes just under 10mph. New motor, new ECU been fitted. Is it something to do with the ...
3 votes
3 answers
1k views

Find replacement battery for this e-bike

My ebike battery totally died today. I can't find the model number for the battery as it is not written anywhere. Here are the pictures:
4 votes
1 answer
192 views

Why do my Urbanbiker Viena electric bike batteries keep failing?

Around late 2019, I bought an Urbanbiker Viena new off Amazon for my daily work commute (around 15km/day at that time, now it’s a bit lower at about 10km/day). After about 4000km, my (first) battery ...
21 votes
7 answers
15k views

Protecting bike attachments such as lights against theft

I was wondering what one could do to keep his bike attachments from being stolen. On Monday two lights were stolen off of my bike. I only had them for a day. It was the kind that has a rubber "strap" ...
2 votes
1 answer
225 views

Is it safe to charge my ebike lifepo4 battery this way?

I have an 8S LiFePO4 battery pack for my ebike project which I tried to charge using my suspicious lithium battery charger. The charger applied a voltage slightly higher than the battery voltage at ...
2 votes
3 answers
287 views

eBike winter battery power

My Bosch eBike has dual batteries which I usually ride with one battery. I feel like as the weather drops to freezing the bike power has dropped off slightly and when I ride with the second battery ...
0 votes
1 answer
671 views

Why is my ebike Shimano display dead?

The bike battery is fully charged. When I plug-in the display, the screen does not come on at all.
1 vote
1 answer
391 views

What Scott 2022 e-bikes have range extenders?

I've looked online and I think it's just the 'Genius' that has the range extender option. Are there any other Scott e-bike models that have this?
1 vote
0 answers
38 views

Bosch Performance No charge?

Hi I have a 2017 Bosch equipped Cannondale Cointreau e it's the performance class 3 Bosch Drive. 500 battery. I'm getting 5 volts at the charger 120 volts going into the charger 5 volts on the output. ...
3 votes
5 answers
305 views

Should pedal assist ebike battery discharge constantly?

I have a Specialized Como 2.0 (pedal assist) which I absolutely LOVE. I want to get as much exercise as possible, so I always ride it as a regular 9 speed and only hit the power button on grades or ...
4 votes
3 answers
1k views

Bicycle computers with nonvolatile memory

The one thing that keeps me from pulling the trigger on some bike computer is the lack of information about the odometer, the lifetime mileage on the bicycle. When you change the battery in your car, ...
5 votes
3 answers
3k views

To what extent should I insulate an electric bike battery during winter?

For temperatures between 0 F (-18 C) and 32 F (0 C), to what extent, if at all, should I insulate electric bicycle batteries? I have read that they do not like temperature extremes. Should I wrap a ...
2 votes
1 answer
133 views

Can not put battery in Winora Youcatan Pro slot

The downwards facing battery slot of this E-bike was never great, and I always needed to fiddle the battery lock key both directions few times while pushing the battery in. This morning I was not able ...
3 votes
1 answer
946 views

Is it safe to use 4A charger on a 2A Battery

My Ebike uses a 48v battery, but the charging amperage listed on the side is 2A, and the original charger likewise is 2A. Having lost that charger, the replacement I could get on short notice is a 4A ...
13 votes
6 answers
4k views

Should I buy a spare integrated battery with my new ebike even though I only plan to use it in years while keeping it at 60% charge over that time?

I just bought a Priority Current ebike that has a battery integrated in the frame. The main disadvantage of this is that there is not third-party version of this battery, a replacement can only be ...
2 votes
2 answers
411 views

Is it safer to remove a battery from an ebike before charging it?

It is possible for me to remove the battery of my ebike and I am wondering if it is safer to do that before charging it. Could there be a potential damage to the electric motor while charging a ...
9 votes
1 answer
1k views

Has anyone successfully changed the battery in a Knog Blinder Mini Dot?

I have a pair of Knog Blinder Mini Dots which were left with their non-user-replaceable LiPo batteries flat over winter and now won’t take a meaningful charge. I’m handy with a soldering iron but less ...
0 votes
2 answers
3k views

KNOG BLINDER ARC 5.5 battery replacement

Can anyone please tell me how I would go about changing the battery over in my light please!!! I have so far taken off the lens cover and have undone the 3 x 1.5mm Allen screws to release the outer ...
2 votes
2 answers
892 views

E-Bike Battery not working

I have borrowed an e-bike from a friend few days ago. Yesterday battery was empty so I left it to charge last night. I left it overnight. Now when I put it in bike it does not work, not responding. I ...
10 votes
2 answers
4k views

Fortified Bicycle appears to gone out of business -- where to get one of their replacement bike light batteries?

One of the two rechargeable batteries that go with my Fortified Bicycle's lights appears to have started to die permanently. (The other remains in good condition.) I have looked through eBay and found ...
0 votes
0 answers
617 views

Specialized Turbo “LO BAT” error with torque loss

My Specialized Turbo has started showing momentary (5 second) “LO BAT” errors on the display, and at the same time the motor switches from torque to a stuttering high drag condition. This only ...
9 votes
5 answers
7k views

Charging eBike Battery with Solar

I need some advice / info on solar charging an eBike battery. We have two RadRovers from Rad Power Bikes. They are powered with a Panasonic Dolphin 48V, 11.6Ah Lithium-Ion battery https://www....
3 votes
2 answers
1k views

Is it normal that the pedalling assistance gets significantly less on an e-bike with low battery?

I recently bought my first e-bike (Coboc Montreal Seven), which is advertised to have a ‘natural riding feeling’ by measuring torque sensor signals and translating them to the ‘right’ amount of ...
2 votes
2 answers
303 views

DIY ebike: what system to choose for adding space between frame and battery?

So, the project is to install this 5kg battery: on this bike: This is no joke. I'm serious. Following up to this previous question, I'm going to use steel rivnuts (aluminium is really too light for ...
2 votes
1 answer
998 views

Blind rivet nuts for ebike battery on frame: aluminium or steel?

I'm planning my first installation of an ebike battery by drilling/riveting the frame (photo of the battery below), here are some details about the project: The battery weights about 5 kg. It's a ...
11 votes
5 answers
9k views

Can I replace my bicycle's dynamo with batteries?

I have a working lightning system on my bike with wired front and rear lights, powered by a dynamo. The dynamo's plastic has broken and I have repaired it several times now, but now it is FUBAR. ...
0 votes
0 answers
238 views

Bosch 500w battery stopped charging [duplicate]

Charger works as I have a second battery and it charges. The 500 watt battery displays a partial charge but does not charge and does not power bike. I have done multiple resets without success. It ...
0 votes
0 answers
38 views

Windgo ebike charging problems

Hi I've been asked to try and repair a friends Windgo ebike problem is with the battery/power it's a new bike yet is not turning on. Also the battery shows the illuminated Red light always and doesn't ...
1 vote
1 answer
192 views

What type of ebike motor would work best for a 13” tire?

I want to drive a yard cart with a motor / battery. The cart has 13” wheels and weighs ~200 pounds loaded. I want to walk behind it, so I’ll need to be able to control the speed between 1-3 mph. ...
2 votes
2 answers
4k views

Ancheer electric mountain bike cuts out under load

My year-old 250W Ancheer electric mountain bike currently has an issue. When going up hills, the motor is put under a lot of load and the battery turns off. It remains off until reset by toggling the ...
2 votes
3 answers
2k views

Shimano Steps E6000 battery charge percentage falls abruptly

When the battery charge gets to about 20-25% it drops abruptly to 5-10%. The steeper the hill and higher the load drop percentage is higher. Examples: from 25% to 6% steep hill from 13% to 8% small ...
0 votes
1 answer
261 views

Best solution for additional (dual) battery for E-bike

I've marked a few possible places for additional battery mount. What do you think is the most reliable place to mount battery in terms of ergonomics of the bike? Also, how to ensure the parts are ...
6 votes
3 answers
4k views

Is it possible to charge an ebike from a 12V solar powered battery?

I would like to use an electric bike while doing wild camping with my camper van. So I won't have a 220v source for days, possible weeks at a time. I am wondering if I could add a battery in my camper,...
3 votes
2 answers
742 views

How can I troubleshoot battery issues on an electric bike?

I've got an electric bike with a GWA Easi-A36 battery (10.8Ah, 33.8V). The bike has a GWA electric motor. When I turn the motor on (on the handlebar "computer"), the battery indicator tells me the ...
-5 votes
2 answers
474 views

Wind (nano-/pico-)turbines installed on bicycles for regenerative charging of batteries?

What is the smallest wind turbine available on the market that has been installed on a bicycle? and what about R&D or even conceptual wind turbine? This question is a follow up to question why are ...
8 votes
2 answers
29k views

Bosch battery stopped charging

It is a Bosch powerpack 500 and the other day it stopped charging. The charger seems to have some output since one of the LEDs on the battery lights up. It is only one LED though and I believe I ...