Bosch BAT621 18V 6.0Ah High-Capacity Replacement Battery
- BAT621 provides 6.0Ah power for high-demand Bosch 18V Professional cordless tools.
- Its 5S2P 18650-cell configuration includes full protection circuitry and verified BMS handshake on genuine Bosch chargers.
- The battery is supplied in retail-ready packaging for distributors and international shipment.
- Every batch includes UN38.3, IEC 62133, MSDS, and CE documentation to support customs clearance in the EU, US, UK, AU, and JP markets.
This is a drop-in replacement battery pack for high-demand Bosch 18V Professional tools. The BAT621 delivers 6.0Ah of power from a 5S2P string of 18650 cells. It has full protection circuitry and verified BMS handshake on genuine Bosch chargers. It is the longest-lasting 18V replacement battery for high-demand cordless power tools.
The BAT621 is made by Dongguan Ruineng New Energy (Nuranu), a high-tech custom battery factory since 2012. It is made on a fully automated assembly line where it is tested 100% at the end of the line. It is designed for original equipment manufacturers (OEM), hardware distributors, and private-label brands that need the same fit and performance as OEM products at factory-direct prices.
Compatible Host Tools
- Bosch 18V Professional high-demand tools
- 18V rotary hammers, grinders & metal-cutting saws
- BAT609 / BAT618 / BAT621 compatible tools
Target Applications
- High-Demand Cordless Tools: The 6.0Ah BAT621 sustains long runtime for high-torque grinders, rotary hammers, and saws under continuous load.
- Production & Industrial Fleets: Maximizes uptime where Bosch 18V tools run all shift.
- Private-Label Brands: Sourced with your branding and carton-ready packaging.
Core Technical Advantages
1. High-Capacity 6.0Ah
Maximum runtime in the Bosch 18V Professional footprint — the highest-capacity pack in the line.
2. High-Capacity 5S2P Architecture
High-capacity 18650 cells sustain the continuous current high-demand tools draw without voltage sag.
3. Verified Charger Handshake
BMS handshakes correctly with genuine Bosch chargers; behaves identically to the OEM pack.
Technical Specifications
| Feature | Specification |
|---|---|
| Replacement Model | BAT621 |
| Compatible Brand | Bosch |
| Nominal Voltage | 18V |
| Rated Capacity (real) | 6.0Ah |
| Cell Type | 18650 · 3000mAh |
| Configuration | 5S2P |
| Shell Color | Black + Red |
| Proprietary Mold | No (standard form factor) |
| Net Weight | Confirmed at order |
| Battery Dimensions | Confirmed at order |
| Inner Box | Confirmed at order |
| Master Carton | Confirmed at order |
| Qty per Carton | Confirmed at order |
| Carton Net / Gross | Confirmed at order |
Packaging & Wholesale Logistics
The BAT621 is shipped in a box ready for retail, designed for distributors to resell and for shipping internationally. Every batch of products is shipped with UN38.3 transport test reports, IEC 62133 safety certificates, MSDSs, and CE Declaration of Conformity. This helps ensure that customs can easily clear the products in the EU, US, UK, AU, and JP markets.
| Item | Details |
|---|---|
| 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 |
Product Video
Frequently Asked by Distributors:
What is the MOQ for the BAT621 replacement battery?
The standard MOQ for the BAT621 is 100 units. You can get paid samples of 1–10 units to check the BMS-handshake before placing an order. Private-label or custom-spec runs start at 500 units.
Is the BAT621 drop-in compatible with original Bosch chargers?
Yes. The BAT621 BMS is updated with specific software so it works correctly with real Bosch chargers. The charging, authentication, and safety lockouts work the same as the original equipment manufacturer (OEM) pack. Handshake is validated on 100% of units at the end of the line.
Can the BAT621 replace the battery in my Bosch 18V cordless drill or power tool?
Yes, the BAT621 is a direct replacement for the Bosch 18V battery. It is used in professional cordless drills, drivers, grinders, and saws. If your tool uses the Bosch BAT-series 18V slide-on pack, the BAT621 is a true replacement battery for Bosch 18V power tools. It fits and works with the original equipment manufacturer (OEM).
Do you offer Bosch battery cell replacement, or complete BAT621 packs?
We supply complete, ready-to-use BAT621 replacement packs. We do not offer cell replacement or rebuild services. A new pack with fresh Grade-A cells and a new BMS is much more reliable than rebuilding an old Bosch pack. It also comes with full UN38.3 / IEC 62133 / CE documentation.
Which Bosch tools is the BAT621 compatible with?
The BAT621 is a direct replacement for the Bosch 18V Professional BAT-series platform. It has the same latch geometry as the BAT609, BAT618, and BAT622, and it fits the corresponding Bosch 18V Professional drills, drivers, grinders, and saws.
What cells and configuration does the BAT621 use?
The BAT621 uses high-quality 18650 cells (3000mAh each) arranged in a 5S2P configuration for a nominal 18V and a true rated capacity of 6.0Ah. Before assembly, cells are matched based on their capacity (±20 mAh) and internal resistance (±5 mΩ). You can specify your preferred cell brand (Samsung, LG, Panasonic, or BAK) when you place your order.
What protection circuitry does the BAT621 include?
The BAT621 includes a full-protection BMS: overcharge, over-discharge, short-circuit, and over-current protection, plus thermal monitoring. It matches the safety behavior of the real Bosch pack.
What is the warranty on the BAT621?
All BAT621 replacement packs come with a 12-month warranty against manufacturing defects. Every batch of products is shipped with the following documents:
– UN38.3 test report
– IEC 62133 certificate
– MSDS
– CE Declaration of Conformity
These documents are needed to clear customs worldwide.