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Robot Vacuum 14.4V · 3.5Ah
Eufy TW4-12 14.4V 3.5Ah
Eufy RoboVac Battery Replacement

Eufy TW4-12 14.4V 3.5Ah High-Capacity RoboVac Replacement Battery

High-capacity Eufy RoboVac battery replacement for the compact RoboVac platform. The TW4-12 is a 14.4V 3.5Ah pack (4S1P) for extended cleaning runtime, verified against the original Eufy battery with OEM-matched cartridge fit and BMS handshake on the genuine Eufy charging base.

Voltage14.4V
Capacity3.5Ah
Cell Type18650 cells
Configuration4S1P
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Overview

High-capacity Eufy RoboVac battery replacement for the compact RoboVac platform. The TW4-12 is a 14.4V 3.5Ah pack (4S1P) for extended cleaning runtime, verified against the original Eufy battery with OEM-matched cartridge fit and BMS handshake on the genuine Eufy charging base.

Manufactured by Dongguan Ruineng New Energy (Nuranu) — a high-tech custom battery factory since 2012 — the TW4-12 is produced under a fully automated assembly line with 100% aging and end-of-line testing. It is engineered for OEM clients, robot vacuum repair distributors, and private-label brands that need OEM-equivalent fit and fade-free runtime at factory-direct pricing.

Eufy TW4-12 14.4V 3.5Ah view 1Eufy TW4-12 14.4V 3.5Ah view 2Eufy TW4-12 14.4V 3.5Ah view 3Eufy TW4-12 14.4V 3.5Ah view 4

Compatible Eufy Models

  • Eufy RoboVac compact-platform robot vacuums
  • Eufy RoboVac high-capacity upgrade
  • TW4-12 latch form factor

Target Applications

  • Eufy RoboVac Compact Owners: A direct, fade-free Eufy RoboVac Compact battery replacement that restores full runtime when the original pack ages.
  • Robot Vacuum Repair & Service Shops: OEM-matched fit and verified charger handshake make the TW4-12 an easy stock item for Eufy Eufy RoboVac Compact repairs.
  • Private-Label & E-commerce Sellers: Sourced with your branding and retail-ready packaging (blister / color box) for Amazon FBA and marketplace resale.

Core Technical Advantages

1. OEM-Matched Eufy RoboVac Compact Fit

Injection-molded shell and latch geometry match the original Eufy RoboVac Compact pack (Eufy RoboVac compact platform · TW4-12 latch) for a true drop-in fit.

2. 18650 Cells, True 3.5Ah

Grade-A 18650 cells in a 4S1P configuration deliver a genuine 3.5Ah at 14.4V — matched and aged for stable, fade-free runtime.

3. Verified BMS Handshake

BMS flashed with Eufy RoboVac Compact-specific firmware charges and reports correctly on the genuine Eufy charger — resolving 'not charging' faults of worn original packs.

Product Video

Factory assembly line, BMS testing, and TW4-12 fit demonstration footage. Contact sales for additional product videos.

Technical Specifications

FeatureSpecification
Replacement ModelTW4-12
Compatible Robot VacuumEufy RoboVac Compact
OEM Series / CodesEufy RoboVac compact platform · TW4-12 latch
Nominal Voltage14.4V
Rated Capacity3.5Ah
Cell Type18650 · 3500mAh
Configuration4S1P
Housing ColorBlack
Proprietary MoldYes (in-house)
Net WeightConfirmed at order
Battery DimensionsConfirmed at order
Qty per Carton48 pcs
Carton Gross WeightConfirmed at order

Packaging & Wholesale Logistics

The TW4-12 ships in retail-ready packaging (blister or color box) engineered for marketplace resale and international freight. Every batch ships with UN38.3 transport test report, IEC 62133 safety certificate, MSDS, and CE Declaration of Conformity for smooth customs clearance in EU, US, UK, AU, and JP markets.

MOQ
100 units (catalog) · 500 units (private label)
Lead Time
25–35 days standard · 18–22 days expedited
Payment
30% T/T deposit + 70% against B/L
Warranty
12 months

Frequently Asked by Distributors

Is the TW4-12 a high-capacity Eufy RoboVac battery replacement?
Yes. The TW4-12 is a high-capacity 14.4V 3.5Ah Eufy RoboVac battery replacement for the compact RoboVac platform, delivering extended runtime with OEM-matched fit.
What is the MOQ for the TW4-12 replacement battery?
Standard MOQ is 100 units for the TW4-12. Paid samples of 1–10 units are available for fit and BMS-handshake validation before a production order. Private-label or custom-spec runs start at 500 units.
Is the TW4-12 drop-in compatible with the original Eufy charger or dock?
Yes. The TW4-12 BMS is flashed with model-specific firmware so it charges and reports correctly on the genuine Eufy charger — state-of-charge, authentication, and safety lockouts behave like the OEM Eufy RoboVac Compact pack. Validated on 100% of units at end-of-line.
How do I replace the battery in my Eufy RoboVac Compact?
Replacing the Eufy RoboVac Compact battery is straightforward: power off the robot vacuum, release the battery latch or clip, remove the old pack, and fit the TW4-12 until it seats. No tools or modification needed — it charges on your genuine Eufy charger or dock.
How long does the TW4-12 battery last per charge?
The TW4-12 delivers a true 3.5Ah at 14.4V, matching or exceeding original-pack runtime. Actual runtime depends on power mode and accessory. Cells are matched and aged so the pack holds capacity over its full cycle life.
Why is my Eufy battery not charging or not holding charge — does a replacement fix it?
A pack that won't hold charge or won't charge usually means end-of-life cells or a failed BMS. A new TW4-12 with fresh Grade-A cells and a fresh BMS resolves 'not charging' and 'not holding charge' faults caused by a worn-out original pack.
Are these genuine Eufy batteries or replacements?
The TW4-12 is a high-quality aftermarket replacement — not an OEM Eufy-branded pack. It is built with Grade-A tier-1 cells, a model-specific BMS, and OEM-matched fit, validated against an original Eufy RoboVac Compact pack on 100% of units, and backed by a 12-month warranty.
What cells and configuration does the TW4-12 use?
The TW4-12 uses Grade-A 18650 cells (3500mAh each) in a 4S1P configuration for a nominal 14.4V and a true rated capacity of 3.5Ah. Cells are matched by capacity (±20 mAh) and internal resistance (±5 mΩ) before assembly. Preferred cell brand (Samsung / LG / Panasonic / BAK) can be specified at order.
What is the warranty on the TW4-12?
All TW4-12 replacement packs carry a 12-month warranty against manufacturing defects. Every batch ships with UN38.3 test report, IEC 62133 certificate, MSDS and CE Declaration of Conformity for smooth customs clearance worldwide.
How is the TW4-12 packed for shipping?
The TW4-12 ships 48 pcs per master carton. Battery dimensions None. Every batch ships with full UN38.3 / IEC 62133 / CE documentation.

Need a Custom Quote or Technical Details?

Our engineering team is ready to discuss specifications, certification, MOQ, and OEM / private-label customization for the TW4-12.

✉ Email Sales 📱 WhatsApp ☎ +86 13823274651

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