Restore your original HJM Bike battery with EMP's professional battery rebuild service. Whether your battery has reduced range, no longer charges properly, or has reached the end of its service life, our technicians can rebuild your original battery using premium lithium-ion cells.

Instead of replacing your entire battery, we replace the internal lithium-ion cells while reusing your original battery housing, mounting system, and connectors whenever possible.

Batteries We Service

EMP services many HJM Bike battery systems, including:

• 36V Lithium-Ion Batteries
• 48V Lithium-Ion Batteries
• Integrated Downtube Batteries
• Rear Rack Batteries
• UL Certified Battery Systems
• 48V 20Ah Battery Packs
• Select HJM Bike battery models

Not sure if your battery is compatible? Send us photos of your battery and label, and we'll confirm compatibility before you ship it.

Upgrade Options

Many HJM Bike batteries can be upgraded during the rebuild process.

Available premium cell options include:

• Samsung
• LG
• Panasonic
• Molicel

Benefits include:

• Increased riding range
• Higher capacity
• Improved power delivery
• Reduced voltage sag
• Longer battery life

Upgrade availability depends on your battery's internal configuration.

What's Included

Every rebuild includes:

• Complete lithium-ion cell replacement
• Cell balancing and matching
• Internal inspection
• BMS evaluation
• Charge and discharge testing
• Final quality inspection