E-Bike & Scooter Battery Repair & Rebuild
We provide professional battery diagnostics, repair, and replacement for e-bikes and scooters. Services include BMS replacement, cell balancing, faulty cell replacement, jumpstarting, charging port replacement, and full battery rebuilds. Restore range, performance, and reliability with expert care for your battery pack.
★ 4.9 on Google · 75+ reviews · Burlingame, CA
Introduction
A healthy battery is essential for the performance and range of your e-bike or scooter. If your battery is losing power quickly, won't charge, or shows inconsistent performance, our technicians can help. We specialize in full diagnostics, component-level repair, and battery pack rebuilding. Whether you need a simple fix, a new charging port, a BMS replacement, or a brand-new battery, we make sure your ride stays reliable and safe.
Service Overview
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Battery Diagnostics & Testing: We start by running detailed diagnostics to measure voltage, capacity, internal resistance, and charge/discharge behavior. This helps identify issues like unbalanced cells, BMS faults, and degraded capacity before recommending next steps.
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BMS Replacement: A faulty battery management system (BMS) can prevent your pack from charging or discharging properly. We replace damaged or outdated BMS units with reliable, compatible replacements to restore safe and stable operation.
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Cell Replacement & Rebuilding: We replace damaged or weak 18650/21700 lithium-ion cells inside your battery pack. If enough cells are failing, we rebuild the entire pack using brand-new, high-quality cells for improved performance and extended lifespan.
- 4
Battery Balancing: When cells in a pack become imbalanced, it affects charge efficiency and reduces range. We balance each cell group so your battery charges and discharges evenly, improving performance and safety.
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Battery Jumpstarting: If your BMS locks out charging due to over-discharge, we can safely jumpstart your battery to recover functionality without requiring full replacement.
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Charging Port Replacement: A loose or damaged port can prevent your ride from charging entirely. We replace worn, burnt, or broken ports with high-quality components for a secure, spark-free connection on every charge.
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Professional Replacement: For batteries that are beyond repair or when performance upgrades are desired, we install new, high-quality packs that meet or exceed OEM standards. All replacements are tested, secured, and calibrated for your specific ride.
Battery Service Pricing
Battery service pricing varies depending on the issue and the type of repair required. Simple diagnostics and minor repairs are on the lower end, while full rebuilds and replacements are on the higher end because of the labor involved.
Prices are for labor; parts such as cells, BMS units, and charging ports are billed separately. Final pricing is confirmed after diagnostics and depends on battery condition.
Known job? We quote it from the price list. Not sure what's wrong? It starts with a diagnostic.
Why Choose Us?
Advanced Battery Expertise: We go beyond simple swaps. Our team understands the internal structure of the lithium-ion battery packs used in e-bikes and scooters, allowing us to diagnose and fix issues others might miss.
Full Rebuild Capabilities: Instead of replacing your entire battery, we can often rebuild it from the inside out, replacing only the necessary components. This saves you money and reduces environmental waste.
Bench Repair, Done Properly: Battery work is done at our Burlingame workshop, with the test equipment and controlled conditions that safe cell-level repair requires. Drop-off is by appointment.
Safety First: Electrical repairs require precision. We use proven techniques and rigorous testing to make sure your charging system is safe and stable.
Related Videos
Why E-Bike Battery Balancing Matters | Cell Voltage Explained
Unbalanced cells are a common reason a battery loses range or stops charging fully. This video explains what cell balancing does, why cells drift apart, and what it looks like when a pack needs attention.
E-Bike Battery Won't Charge? Self-Discharge & BMS Cutoff Explained
A battery that sits unused can self-discharge below the BMS's minimum voltage, which locks out charging as a safety protection. This video explains why that happens and how a controlled bypass safely brings the pack back above the cutoff so it can charge normally again. This isn't a DIY fix — if your battery won't charge, we can recover it safely.
Service
FAQs
Frequently Asked Questions & Technical Specifications
Watch for symptoms like reduced range, failure to charge, fast voltage drop, unusual heat, or your scooter or e-bike turning off during a ride. These often indicate issues with cells, BMS, or imbalance.
Battery service at EVE MODS typically runs $80 – $350+ for labor, with parts such as cells, BMS units, and charging ports billed separately. Diagnostics and minor repairs are at the lower end and full rebuilds at the higher end. The final price is confirmed after diagnostics.
All battery work is done at the EVE MODS workshop in Burlingame, CA, by appointment. Battery repair needs bench test equipment and controlled conditions, so it is not offered on-site. Riders drop off from across the San Francisco Peninsula.
Yes. We can test and replace faulty cells inside your battery using matching high-quality lithium-ion cells. We also re-balance the pack and make sure the BMS is working properly.
Yes. If your battery isn't charging, isn't powering your vehicle, or turns off unexpectedly, a faulty BMS is often to blame. We can replace or repair the BMS depending on your battery type.
Signs of a faulty charging port include intermittent charging, no response when plugged in, or visible damage to the port. If your e-bike or scooter isn't charging properly, it's time to get the port checked and replaced if necessary.
We replace charging ports on most e-bike and scooter models. Our technicians handle a variety of designs and make sure the new port is compatible with your battery and charger.
The replacement itself typically takes about 30 to 60 minutes of bench time, depending on the complexity of the repair. Turnaround depends on the workshop schedule and is confirmed when you book.
If the issue isn't with the charging port, our technicians diagnose the rest of the electrical system, including the charger, BMS, and cells, to identify and resolve the root cause.
A typical rebuild takes 1–3 business days, depending on pack size, parts availability, and complexity. We always provide a time estimate after diagnostics. Rebuilds are bench work and are done at our Burlingame workshop, not on-site.
Ready to Book Your Service?
Send a photo and a short description. If the job is clear, we quote it from the price list. If the cause is unknown, it starts with a diagnostic. No repair starts until you approve the price.