Overview
The 21700 3.7V 3000mAh rechargeable Li-ion battery is designed for DIY electronics, RC devices, portable equipment, LED lighting, toys, small robots, and other low-voltage power applications. This product is available in several connector versions, including XH2.54 red-black wire terminal, XH2.0 red-black wire terminal, two-wire output, and single 21700 cell options. Please choose the correct connector type before ordering, because different devices may use different plug polarity and plug size.
Available Options
| Option | Battery Type | Connector / Output Type | Description |
|---|---|---|---|
| Single 3.7V 3000mAh / XH2.54 Red-Black Terminal | 1S Li-ion battery | XH2.54 plug | Comes with red and black wires and XH2.54 connector |
| Single 3.7V 3000mAh / Two Wires | 1S Li-ion battery | Bare red/black wires | No plug, suitable for soldering or custom DIY connection |
| Single 3.7V 3000mAh / XH2.0 Red-Black Terminal | 1S Li-ion battery | XH2.0 plug | Comes with red and black wires and smaller XH2.0 connector |
| 21700 3000mAh × 1 Cell | 21700 cell | No connector | Single 21700 battery cell option |
Key Features
The 21700 3.7V 3000mAh battery provides a compact rechargeable power source for small electronic devices. The 3000mAh capacity offers longer runtime than many smaller 18650-style or flat lithium battery packs, while the 3.7V nominal voltage makes it suitable for many 1S Li-ion applications.
Multiple connector choices make this battery easier to match with different devices. The XH2.54 connector is a common larger 2-pin plug, while the XH2.0 connector is smaller and often used on compact electronics. The two-wire version is suitable when you need to solder or replace the original plug yourself.
The battery is designed with safety in mind, featuring protection against common charging and discharging risks such as overcharge, overcurrent, over-temperature, over-voltage, short circuit, and excessive power discharge. The product images also indicate a reinforced shell structure, insulation design, and safety valve structure for improved reliability.
Connector Polarity Notice
Before installation, please carefully compare the positive and negative polarity of your original battery plug. Even when the plug size is the same, the red and black wire positions may be different.
In general:
| Wire Color | Polarity |
|---|---|
| Red wire | Positive “+” |
| Black wire | Negative “-” |
If the connector polarity does not match your device, do not plug it in directly. Incorrect polarity may damage the device or battery. You can use the two-wire version or adjust the plug wiring only if you understand battery wiring safety.
Specifications
| Parameter | Details |
|---|---|
| Product Type | Rechargeable Li-ion Battery |
| Cell Model | 21700 |
| Nominal Voltage | 3.7V |
| Capacity | 3000mAh |
| Battery Configuration | Single cell / 1S |
| Connector Options | XH2.54, XH2.0, two-wire output, or bare 21700 cell |
| Wire Color | Red / Black |
| Rechargeable | Yes |
| Application | DIY electronics, RC devices, small robots, LED lighting, toys, portable equipment |
Applications
This 21700 3.7V 3000mAh rechargeable battery is suitable for many low-voltage electronic projects and replacement battery applications, including RC models, DIY robots, small portable devices, LED lights, handheld electronics, learning kits, wireless modules, and other devices requiring a 3.7V Li-ion power source.
Package Includes
Package content depends on the selected option:
| Selected Option | Package Includes |
|---|---|
| XH2.54 version | 1 × 21700 3.7V 3000mAh battery with XH2.54 plug |
| Two-wire version | 1 × 21700 3.7V 3000mAh battery with red/black wires |
| XH2.0 version | 1 × 21700 3.7V 3000mAh battery with XH2.0 plug |
| 21700 cell version | 1 × 21700 3000mAh battery cell |
Important Notes
Please confirm the connector size, wire polarity, voltage, and battery capacity before purchase. XH2.54 and XH2.0 connectors are not the same size. If your original battery plug is different, choose the two-wire version or contact the seller before installation. Do not short-circuit, puncture, reverse-connect, overcharge, or expose the battery to high temperature.
