Apollo City Charger Problem

You're staring at your Apollo City scooter, the charger plugged in, and after hours of waiting… nothing. The red light on the charger brick that's supposed to turn green when charging is complete never even showed up. Maybe it stayed green the whole time.

Maybe it stayed dark. Either way, your battery didn't charge, and you're stuck.

This exact Apollo City charger problem is one of the most common complaints among owners, and it usually comes down to one of three things: a dead charger brick, a tripped battery management system (BMS), or a damaged charging port. The good news? Two of those three you can fix yourself in under ten minutes.

Per manufacturer specifications, the OEM charger should output 54.6V for a 52V pack (City Pro) or 50.4V for the standard 48V pack. Anything outside that range means the brick itself is the problem. Let's walk through exactly how to tell which scenario you're dealing with.

Why This Needs Your Attention Before You Plug In Again

Before we get into troubleshooting, let's be clear about the stakes. An Apollo City charger that behaves erratically isn't just an inconvenience. It can be a safety risk.

Lithium-ion battery packs like the one in your Apollo City store a lot of energy in a small space. The charger's job is to deliver that energy at a controlled rate and stop when the battery is full. When the charger fails, it can do one of two dangerous things: deliver too little voltage, leaving you stranded, or deliver too much voltage, which can damage the cells or cause thermal runaway.

As of 2026, Apollo has made improvements to their charger design. But older units, especially those shipped with 2022 and early 2023 models, have a known failure rate with the internal relay and thermal sensor. Aggregate owner reports indicate roughly 8-12% of original chargers fail within the first year.

That's not terrible, but it's high enough that you should take any charging issue seriously.

The first rule: if your charger smells like burning plastic, gets too hot to hold, or makes crackling noises, unplug it immediately and stop using it. A replacement charger costs between $55 and $85. A fire in your garage costs a lot more.

Step 1: The Quick Check – Is It the Charger or the Scooter?

This is the simplest diagnostic question you can answer. Your goal is to isolate the problem: is the charger itself dead, or is the scooter refusing to accept a charge?

If the charger LED stays green the instant you plug it in:

That means the charger is getting AC power from the wall but immediately thinks the battery is full. This could mean the charger's internal relay is stuck, or the BMS in the scooter has entered a protection state. The charger is likely fine.

The scooter might be the issue.

If the charger LED stays completely dark (no light at all):

The charger isn't receiving or converting AC power. This could be a dead brick, a broken cable, a blown internal fuse, or simply a bad wall outlet. Try another outlet first.

If nothing changes, the charger brick is probably the problem.

If the charger LED turns red briefly, then goes dark:

This is a classic sign of a failing component inside the brick. The charger tries to start the charge cycle, detects a fault, and shuts itself off. Replacement is the safest move.

If the scooter display won't turn on at all even after being plugged in for hours:

This points to a deeply discharged battery that the BMS has locked out. Your charger might be working fine, but the BMS won't let it charge because the voltage is too low. We'll cover the fix for that in Step 5.

Don't assume the wall outlet is good just because something else is plugged in nearby. Extension cords, especially long ones or old ones, can drop voltage enough that the charger's safety circuits won't let it start. Try plugging directly into a wall outlet you know works.

Image source: Bing (Web (fair-use with source credit))

Step 2: How to Test Your Apollo City Charger with a Multimeter

This is the only way to know for sure whether your charger is working. If you don't own a multimeter, you can grab a basic one for under $25 at any hardware store. It's a worthwhile investment if you own an electric scooter.

Here's the step-by-step process:

1. Unplug the charger from the scooter and from the wall. Safety first.
2. Set your multimeter to DC voltage. Use the range that covers at least 60V. The 200V setting is common.
3. Plug the charger into the wall. Keep the output end away from anything conductive.
4. Touch the red multimeter probe to the center pin of the barrel connector. The black probe goes to the outer metal sleeve.
5. Read the voltage on the screen.

Image source: Bing (Web (fair-use with source credit))

If you don't feel comfortable using a multimeter on live electrical equipment, skip this step and contact Apollo support or a qualified electrician. But if you follow basic safety precautions, this is a safe and reliable diagnostic method.

Step 3: What to Do If the Charger Is Dead

If your multimeter showed 0V or a reading well outside the expected range, your charger brick has failed. This happens for a few common reasons:

Blown internal fuse. Some Apollo City chargers have a small glass fuse inside the brick that can blow from a power surge or age. The brick is not designed for user repair. Opening it voids the warranty and exposes you to the risk of electric shock from charged capacitors.

Failed internal relay. The relay that switches the charger from standby to charging mode can weld shut or fail open. This often produces the green light immediately symptom or no light at all.

Broken cable. The wire between the brick and the barrel connector can break internally, especially if it's been bent sharply near the connector strain relief. This is more common than you'd think.

Your options:

• Order a replacement charger from Apollo directly. This is the safest option. Make sure you select the correct one for your model (48V vs. 52V). Apollo's parts store lists the City charger at roughly $65 plus shipping. It typically ships within 2-5 business days.
• Use a third-party charger as a temporary fix. A generic 48V or 52V lithium-ion charger with the correct barrel connector can work. But you need to match the voltage exactly, and you lose the smart cutoff features that protect your battery. Don't make this a permanent solution.
• File a warranty claim. If your Apollo City is less than one year old and you have proof of purchase, the charger is covered. Apollo will ask for video evidence of the failure, so have that ready.

Never mix 48V and 52V chargers. Plugging a 52V charger into a 48V battery pack can overcharge and damage the cells. Plugging a 48V charger into a 52V pack won't fully charge it.

Check the label on the charger brick before you plug it in.

Step 4: What to Do If the Charger Works but the Scooter Won't Charge

Your multimeter showed the right voltage. The charger LED turns red when you plug it in. But after an hour, the battery level hasn't budged.

Or the scooter display stays dark no matter how long you leave it plugged in.

The charger is fine. The issue is inside the scooter.

1. A damaged charging port. The barrel connector on the scooter side can get bent pins, debris inside the socket, or loose solder joints. Remove the charging port cover and shine a flashlight inside.

Look for bent or broken pins, dirt, or signs of melting. If the port looks damaged, you'll need a replacement.

2. A blown fuse inside the scooter. The Apollo City has a main fuse that protects the battery and controller. If this fuse blows, the scooter won't charge or turn on.

The fuse location depends on your model year. On the City 2022, it's near the battery compartment under the deck. On the City 2023 and Pro models, it's integrated into the battery management board.

Check your owner's manual for the exact location and fuse rating.

3. A disconnected or damaged battery wire. The thick wires running from the battery to the charging port and controller can vibrate loose over time, especially on rough terrain. Open the deck and inspect the connections.

Make sure all connectors are fully seated and not corroded.

4. The battery is in deep discharge protection. This is the most common cause of a scooter that won't charge despite a healthy charger. When a lithium-ion battery pack drops below its minimum voltage threshold (usually around 38V for a 48V pack), the BMS locks itself down to prevent fire.

It refuses to accept a charge because it considers the battery unsafe. This is common if you left the scooter sitting for months without charging, or if you ran the battery completely flat.

Step 5: The BMS Reset Trick That Saves Most Riders

If your battery is in deep discharge protection, a BMS reset will fix it about 80% of the time. Here's how it works.

The battery management system is a small circuit board attached to your battery pack. It monitors each cell group and can disconnect the battery from the charging port if it detects unsafe conditions. When you reset it, you're telling the BMS to re-evaluate the battery and allow charging again.

Standard BMS reset procedure for Apollo City:

1. Unplug the charger from the scooter and the wall.
2. Wait at least 30 minutes. This lets the BMS capacitors discharge fully.
3. Plug the charger into the wall first, then into the scooter.
4. Wait 10-15 seconds. Watch the charger LED. If it turns red, the reset worked and charging has started.
5. If the LED stays green, unplug everything, wait another 30 minutes, and try again.

If the standard reset doesn't work, some owners report success with a "jump-start" method. This involves briefly connecting a healthy battery in parallel with the locked-out battery to raise its voltage above the BMS threshold. We do not recommend this. It requires direct access to battery terminals, exposes you to high voltage, and can cause sparking or fire if done incorrectly. Leave this to a qualified technician.

Image source: Bing (Web (fair-use with source credit))

When the reset doesn't work:

If you've tried the standard reset three times and the scooter still won't charge, the battery likely has one or more permanently damaged cells. A replacement battery pack for the Apollo City runs roughly $250-$350 depending on the model. Contact Apollo support for a quote and installation guidance.

Safe Charging Habits That Prevent This from Happening Again

Once you get your City charging again, a few simple habits will reduce the chance of this happening again.

Don't run the battery all the way to zero. Lithium-ion batteries last longer and stay healthier when you keep them between 20% and 80% charge. Avoid draining the battery completely before charging.

Charge in a cool, dry place. The ideal charging temperature range is between 50°F and 85°F. Charging in direct sunlight or below freezing stresses the battery and can trigger BMS protection.

Use the charger that came with your scooter. Third-party chargers may have different charge curves that confuse the BMS. Stick with the OEM charger unless you know exactly what you're doing.

Don't leave the scooter plugged in for days. Once the battery reaches full charge, the BMS stops the charging current. But some chargers will top off the battery periodically, which creates unnecessary wear. Unplug the charger once the LED turns green.

Inspect your charging port monthly. Look for bent pins, debris, or signs of heat damage. A quick visual check takes ten seconds and can catch problems before they leave you stranded.

When to Call Apollo Support (and What to Say)

Apollo's customer support team can handle warranty claims, replacement orders, and advanced troubleshooting. But you'll get faster results if you come prepared.

Call Apollo when:

• Your charger is less than one year old and showing signs of failure
• The BMS reset failed after three attempts
• You see physical damage to the charging port or battery wires
• The scooter display shows an error code you can't find in the manual

What to have ready before you call:

• Your order number or proof of purchase
• The model year of your Apollo City
• A video showing the charger behavior or multimeter reading
• Your scooter's serial number (located under the deck)

Apollo's standard warranty covers the charger for one year from the date of purchase. They'll typically ask you to send a video of the failure and will ship a replacement if the charger is confirmed defective. Turnaround time is usually 3-7 business days.

Frequently Asked Questions

Why does my Apollo City charger show green immediately when plugged in?

This usually means the charger thinks the battery is already full. It could be a stuck internal relay in the charger or a BMS that has locked out the battery. Try the BMS reset procedure in Step 5.

If that doesn't work, test the charger output with a multimeter to confirm it's functioning.

Can I use a different charger for my Apollo City?

You can use a third-party charger as a temporary fix, but it must match your battery voltage exactly. A 48V charger for a 48V pack, a 52V charger for a 52V pack. Using the wrong voltage can damage your battery or cause a fire.

For long-term use, stick with the OEM charger from Apollo.

How long does an Apollo City charger last?

Average lifespan is 1-3 years depending on usage and storage conditions. Chargers that are kept in hot garages or dropped frequently tend to fail sooner. The internal relay and fuse are the most common failure points.

My Apollo City won't turn on after charging. What happened?

If the scooter display stays dark after charging, the battery may have entered deep discharge protection. Try the BMS reset procedure. If that doesn't work, check the main fuse inside the scooter.

A blown fuse will need replacement before the scooter will power on.

Is it safe to charge my Apollo City overnight?

It's generally safe because the BMS stops charging once the battery is full. But it's better practice to unplug the charger once the LED turns green. Charging overnight every night adds unnecessary cycles and can degrade the battery faster over time.

Does Apollo cover charger replacement under warranty?

Yes, the charger is covered under Apollo's one-year warranty. You'll need proof of purchase and video evidence of the failure. Contact Apollo support through their website to start the warranty claim process.