Description
| No. | Product Description | Parameter 1 | Parameter 2 | Parameter 3 | Parameter 4 |
|---|---|---|---|---|---|
| 1 | Electrochemical System | NCA | NCA | LFP | LFP |
| 2 | Cell Model | 18650 | 21700 | 26700 | 32700 |
| 3 | Cell Capacity | 2.6Ah | 5Ah | 5Ah | 6Ah |
| 4 | Configuration | 4S4P | 4S2P | 5S2P | 5S2P |
| 5 | Nominal Capacity | 10.4Ah | 10Ah | 10Ah | 12Ah |
| 6 | Rated Power | ≈153Wh | ≈148Wh | ≈160Wh | ≈192Wh |
| 7 | Dimensions | L85×W80×H70 mm | L90×W72×H45 mm | L135×W72×H55 mm | L165×W71×H65 mm |
| 8 | Nominal Voltage | 14.8V | 14.8V | 16V | 16V |
| 9 | Standard Charge Current | 5A | 5A | 5A | 5A |
| 10 | Standard Discharge Current | 5A | 5A | 5A | 5A |
| 11 | Battery Cell Charging Cut-off Voltage | 16.8V | 16.8V | 18.25V | 18.2V |
The 21V 4.0Ah 18650 power tools battery pack is a high-capacity lithium-ion replacement designed to deliver strong, stable, and long-lasting power for cordless tools. Built from premium-grade 18650 cells, this pack ensures efficient energy output with minimal voltage drop, making it ideal for drills, impact wrenches, saws, and other portable equipment.
With its 4.0 amp-hour (Ah) capacity, it provides extended runtime compared to standard 2.0Ah or 3.0Ah batteries, reducing downtime during heavy work. The 21-volt nominal voltage delivers consistent torque and performance, while built-in protection circuits safeguard against overcharging, over-discharging, and short-circuiting.
This replacement battery pack is often compatible with major power tool brands using 21V lithium platforms, making it a reliable and cost-effective choice for professionals and DIY enthusiasts alike. Whether in workshops, construction sites, or maintenance tasks, it combines high energy density, durability, and lightweight convenience to maximize tool efficiency and productivity.
What’s inside the battery pack
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