DAHON Unio E20 & K-One 36V Seatpost Battery Rebuild | 10.5Ah Upgrade

DAHON 36V Seatpost Battery Rebuild – Unio E20 & K-One Bring your original DAHON seatpost battery back to life without paying the cost of replacing the complete battery assembly. E-Bike Marketplace now offers an in-house rebuild service for the 57mm DAHON seatpost battery used with compatible Unio E20 and K-One electric bicycles. The original DAHON 57mm replacement battery is rated at 36V 9.5Ah. Our upgraded rebuild is designed to increase capacity to approximately 36V 10.5Ah using a completely new matched set of premium 18650 lithium-ion cells while retaining your original DAHON battery enclosure and compatible electronics whenever serviceable. 36V 10.5Ah Capacity Upgrade Instead of simply restoring an aging battery, our goal is to improve it. Original DAHON specification: 36V nominal 9.5Ah 57mm seatpost battery EMP upgraded rebuild: 36V nominal Up to 10.5Ah Approximately 378Wh New matched 18650 lithium-ion cells Original seatpost enclosure retained Original connector system retained Battery protection system tested Full charge/discharge and safety testing before return The 10.5Ah rebuild provides approximately 10% more rated capacity than the original 9.5Ah battery, giving riders additional usable energy while preserving the clean, integrated seatpost design of the DAHON bicycle. Rebuild Price – $549 Our price: $549 + return shipping This is a battery rebuilding service. You send us your existing DAHON seatpost battery and we rebuild the internal battery pack. A complete replacement 57mm DAHON battery is currently advertised by DAHON at $599 sale / $699 regular price. Our service gives owners another option: retain the original battery hardware while replacing the aging lithium-ion cells and upgrading the pack's capacity where compatible. Why Rebuild Your DAHON Battery? Lithium-ion batteries naturally lose capacity as they age. A battery may still charge and operate while providing significantly less range than when it was new. A professional rebuild allows us to replace the aging cell group rather than unnecessarily replacing the entire seatpost assembly. Our technicians disassemble the battery, inspect the electronics and enclosure, replace the lithium-ion cell pack, rebuild the electrical connections, and test the completed battery before it leaves our facility. What We Reuse Whenever they remain serviceable, we preserve: Original DAHON seatpost enclosure Original mounting system Original wiring and connectors Original battery management/protection electronics Original mechanical components The internal lithium-ion cells are replaced with a new matched cell group. Compatibility Designed specifically for the 57mm DAHON seatpost battery associated with compatible: DAHON Unio E20 DAHON K-One Other DAHON models using the same 36V 57mm seatpost battery, subject to inspection IMPORTANT: DAHON also produced K-One configurations using a 53mm seatpost battery. Please measure or verify your battery before ordering. If you are unsure, contact us with photos of your battery and label. How the Rebuild Process Works 1. Place your rebuild order Purchase the rebuild service online. 2. Send us your original battery Carefully package your DAHON seatpost battery and include your contact/order information. 3. Battery inspection Our technicians inspect the battery enclosure, electronics, connections and existing cell configuration. 4. Internal rebuild The original aging cells are removed and replaced with a new matched lithium-ion cell group. 5. Testing and quality control The completed battery is charged, discharged and tested for proper operation and protection functionality. 6. We ship your rebuilt battery back Once testing is complete, your original DAHON seatpost battery is returned with its new internal cell pack installed. Important Rebuild Disclosure This listing is for a rebuild service and not a new DAHON battery. The customer must provide an original compatible battery. Final rebuild specifications depend on the internal construction and condition of the battery received. Damaged enclosures, proprietary electronics, failed BMS components or previously modified batteries may require additional work. We will contact you before performing additional chargeable work. E-Bike Marketplace is an independent battery rebuilding company and is not affiliated with or endorsed by DAHON. DAHON trademarks and model names are used only to identify battery compatibility.