Tenergy TN477U 8-Bay Fast Charger for AA/AAA Ni-MH/Ni-CD Rechargeable Batteries with Micro USB and USB C Inputs
Quick take
The Tenergy TN477U is an 8-bay AA/AAA fast charger for Ni-MH and Ni-Cd rechargeable batteries, powered by either Micro-USB or USB-C (DC 5V). It targets quicker turnaround with rated charging currents of 500mA for AA and 250mA for AAA, plus per-bay LED status showing when charging is complete. The biggest buying caveat is simple: it relies on a USB 5V power source, and a Micro-USB to AC adapter is not included.
Pros and cons
Pros
- 8-slot design for mixing AA and AAA rechargeable batteries (Ni-MH and Ni-Cd).
- USB powered via Micro-USB or USB-C, making it easier to run from common 5V power sources.
- Rated fast charging currents: 500mA for AA and 250mA for AAA.
- LED status lights indicate charging versus fully charged states.
Cons
- You need a suitable 5V USB power setup, since a Micro-USB to AC adapter is not included.
- Charging speed depends on battery size (AA is faster than AAA).
- Battery charge-time estimates vary by battery capacity, so real-world time may differ from the formula.
What buyers think
Buyer-review evidence points to strong day-to-day practicality. Many comments emphasize that the charger is easy to use and quick to get running, with LED behavior that helps confirm charging and full-charge status (flashing while charging and solid when complete). Several buyers also describe it as a good value and highlight its fast charging compared with slower chargers they have used. The review set is limited, but overall themes are consistent around usability, charging effectiveness, and convenient USB power.
What this charger is for
The Tenergy TN477U is a straightforward solution for households that use rechargeable AA and AAA batteries in devices like remotes, controllers, flashlights, and other everyday electronics. It is built specifically for Ni-MH and Ni-Cd rechargeables, and it supports 8 charging slots so you can recharge multiple batteries at once instead of doing them one pair at a time.
Charging power and timing, in practical terms
This charger’s stated charging rates are:
- AA: 500mA
- AAA: 250mA
That means AA batteries are generally expected to recharge faster than AAA. The charger also provides a charge-time estimation approach based on battery capacity divided by the relevant mA rate, so if you track mAh ratings on your cells, you can get a rough expectation for how long a “from empty to full” cycle may take. Actual times can still vary by the specific battery capacity and condition.
USB power inputs (Micro-USB and USB-C)
The TN477U is designed to run from DC 5V with an input rated at 5V 2A. It includes both Micro-USB and USB-C inputs, and it is designed to deliver the same charging rate regardless of which input is used. If both ports are connected at the same time, the charger draws power via the USB-C connection.
One practical detail to plan for: a Micro-USB to AC power adapter is not included. If you do not already have a 5V adapter or an appropriate USB power source, you will want to pick one that matches a solid 5V output.
LED status lights and built-in protections
The charger uses blue LED lights to show charging status. The charging indicator behavior described by buyers generally aligns with simple cues: lights indicate that charging is happening, and then switch to a different state once batteries are fully charged.
It is also designed with multiple safety and compatibility features, including short-circuit and reverse polarity protections, bad cell detection, and a shut-off timer approach (negative delta V cut-off).
Pros and cons: who should buy it
Buy it if you want a practical 8-slot USB charger
- You charge Ni-MH or Ni-Cd AA and AAA batteries and want capacity for up to 8 cells at a time.
- You prefer a charger you can power from USB (for example, from a USB power supply you already own).
- You want visible LED cues for charging versus completed charging.
Skip it if you need an all-in-one power setup
- You do not have a compatible 5V USB power source on hand, since the AC adapter is not included.
- You only use a different battery chemistry (this model is for Ni-MH and Ni-Cd, not other chemistries).
Comparison notes (how to choose your next charger)
If you are comparing battery chargers, the biggest decision points are usually charging chemistry support, the number of bays, whether the charger runs from USB, and whether it clearly indicates charge completion. Here, the TN477U scores well on USB convenience and an 8-slot layout for AA and AAA. The main differentiator to weigh against other options is whether they offer USB-C/Micro-USB input convenience and whether they match your battery type (Ni-MH or Ni-Cd) while delivering the charging rate you want for AA versus AAA.
Verdict
The Tenergy TN477U is a solid pick for anyone who needs an 8-bay AA/AAA charger that runs from USB power and supports Ni-MH and Ni-Cd rechargeables. Its rated fast charging currents and LED status cues make it a user-friendly choice for everyday recharging, with the clear tradeoff that you need the right 5V USB power setup since a Micro-USB AC adapter is not included.
FAQ
Will this charge any AA or AAA rechargeable batteries?
It is compatible with Ni-MH and Ni-Cd rechargeable batteries in AA and AAA sizes. If your cells are a different chemistry, you will need a charger designed for them.
How fast does it charge?
The charger is rated at 500mA for AA and 250mA for AAA. Faster charging generally applies to AA than AAA, and total time will vary based on your battery capacity.
Does it require two batteries to charge together?
It is designed to charge without requiring you to recharge batteries in pairs, which is helpful when you have mixed needs across devices.
What do the LED lights indicate?
The LEDs provide a simple charging status display, with one state indicating charging in progress and another state indicating the batteries are fully charged.
Can I power it using USB-C or Micro-USB?
Yes. It supports both inputs and is intended for DC 5V power. If you plug both in at once, the charger draws power via the USB-C connection.
Is a power adapter included?
A Micro-USB to AC power adapter is not included, so you will want to supply your own compatible 5V USB power source.
Specifications
| Product Title | Tenergy TN477U 8-Bay Fast Charger for AA/AAA Ni-MH/NICD Rechargeable Batteries with Micro USB and USB C Inputs |
|---|---|
| Category | Electronics > Household Batteries, Chargers & Accessories > Battery Chargers |
| Brand | Tenergy |
| Manufacturer | Tenergy |
| Color | Black |
| Item Weight | 145 Grams |
| Product Dimensions | 3.94"D x 5.39"W x 1.02"H |
| Output Voltage | 5 Volts |
| Input Voltage | 5 Volts |
| Current Rating | 0.5 Amps |
| Amperage | 500 Milliamps |
| Number of Ports | 8 |
| Item Dimensions D x W x H | 3.94"D x 5.39"W x 1.02"H |
| Specification Met | FCC, CE, CEC |
| Mfr Part Number | TN477U |
| UPC | 844949031561 |
Available variants
Size
- 8AAA + Charger
- 4AA + 4AAA + Charger
- Premium Pro 8AA + 8AAA + Charger
- Premium Pro 8AA + Charger
- Charger Only
- 8AA + Charger
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