E-flite 1S USB Li-Po Charger 300mA - Portable 1-Cell Charger

In this review of the E-flite 1S USB Li-Po Charger 300mA the bottom line is straightforward: this small USB charger is for hobbyists who need a compact, dedicated solution for charging single-cell Li-Po batteries that use the E-flite ultra micro connector. The unit's biggest selling point is convenience - it draws power from any standard USB port, including a computer, car adapter, or USB AC adapter, making it useful at the field, in a workshop, or while traveling. For anyone who flies ultra-micro models and dislikes hauling larger chargers or disposable batteries, this is an attractive, simple option.

Key Features

• E-flite ultra micro connector: Charges most 1S batteries designed for the E-flite ultra micro plug so you can use the same connector common on many micro helicopters and planes.
• USB powered: Works from any powered USB port, letting you charge from a laptop, car USB adapter, or USB AC adapter for flexible on-the-go use.
• Provides a 4.2V 300mA output suitable for gentle charging of single-cell Li-Po packs to extend battery longevity when used correctly.
• The charger accepts a 5.0V 350mA DC input so it will run from the common USB power profile without extra cables or adapters.
• Portable convenience: Small and lightweight, it eliminates the need for alkaline batteries in some controllers and reduces pack swapping for casual flying sessions.

Who It's For

This charger is best for modelers who fly ultra-micro helicopters and aircraft that use 1-cell Li-Po packs with the E-flite ultra micro connector and who value portability and simple USB-powered charging. It suits hobbyists who typically top up packs between short flights and want a lightweight, no-fuss device to keep a few batteries ready.

It is not the best choice for pilots who need fast high-current charging, balance-charging multiple cells, or advanced battery diagnostics. Users requiring long-term heavy-duty reliability or frequent high-current cycles should look to bench chargers and balance chargers instead.

Pros & Cons

Pros

• Compact USB operation makes it easy to carry and use from laptops, car adapters, or AC USB adapters.
• Designed specifically for the E-flite ultra micro connector, minimizing adapter hassles for compatible packs.
• Gentle 300mA output helps preserve the life of small 1-cell Li-Po batteries when used for regular top-up charging.
• Customers find it good value and report it is easier to use than some original designs.

Cons

• Some users report limited long-term reliability, with a few units failing after periods of use.
• Not suitable for multi-cell packs, fast charging, or advanced battery balancing needs.

Specifications

Brand	E-flite
Input	DC 5.0V 350mA (USB)
Output	DC 4.2V 300mA
Battery Type	1S Li-Po (single-cell)
Connector	E-flite ultra micro connector
Use Case	USB computer, USB car charger, or USB AC adapter

Our Verdict

The E-flite 1S USB Li-Po Charger 300mA is a practical, low-cost accessory for pilots of ultra-micro models who need a simple, portable way to recharge single-cell Li-Po packs. It delivers reliable, gentle charging from any USB source and represents good value for casual users, though those needing faster or more robust chargers should choose a higher-end balance charger.

Frequently Asked Questions

Will this charge 2S or larger Li-Po packs?
No. This charger is designed for single-cell 1S Li-Po packs and outputs 4.2V at 300mA, so it is not suitable for 2S or larger packs.

Can I use any USB power source?
Yes, it works from USB computer ports, USB car charger adapters, or USB AC power adapters that supply the standard 5V USB output.

Is it safe for battery health?
When used as intended for 1S packs at its 300mA charge rate, it provides a gentle charge that is generally good for small Li-Po longevity, but always follow battery care and storage guidelines.