I threw my manual away. can anybody tell me what the difference is between solid red leds and blinking red leds?

Solid red indicates that the batteries are charging. Blinking red LED means at least one cell is damaged and cannot be charged safely. Damaged cells should be disposed of promptly and properly.

Can this charge an odd number of batteries?

No, this AmazonBasics charger can only charge even number of batteries. That means 2x AA, 4x AA, 2x AAA, etc. Also, you cannot group 1x AA and 1x AAA as a pair.

Can i use this charger to charge only 2 batteries or i need to put batteries in all 4 slots?

It's two left two right or all 4 not sure on mixing sizes if you have 3299 USB then there is a pdf of the instructions 4227.pdf in Google should get you there. https://www.batteryspace.com/prod-specs/4227.pdf&ved=2ahUKEwjolKTupIHfAhVpw4MKHQAnAfMQFjAFegQIBBAB&usg=AOvVaw1xyiATwKih9nPrJvkC-Od-&cshid=1543758640486

can i charge the batteries with a portable battery using the usb?

According to the instructions if you have anything charging using the USB plug in then batteries will not be charged until you are finished charging with the USB plug. In other words you cannot use both at the same time.

Amazon Basics Rechargeable Battery Charger For Aa And Aaa Ni

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Description

🔋 Stay charged, stay unstoppable — power your life the smart way!

SMART SAFETY GUARD - Overcharge cut-off and wrong polarity protection for worry-free charging.
TRAVEL READY DESIGN - Slim flip-down plug with worldwide voltage support keeps you powered globally.
MULTI DEVICE USB PORT - Charge your smartphone or handheld gadgets alongside your batteries.
EFFORTLESS POWER BOOST - Plug in, pair up, and power on — no buttons, no hassle.
DUAL BATTERY COMPATIBILITY - Seamlessly charges both AA and AAA Ni-MH batteries in pairs.

The Amazon Basics Rechargeable Battery Charger is a compact, travel-friendly device that efficiently recharges 2 or 4 AA or AAA Ni-MH batteries in about 4 hours. Featuring a USB port for charging smartphones and other devices, it supports worldwide voltage (100-240V) and includes safety features like overcharge protection and wrong polarity prevention. Its simple plug-and-play design with LED indicators ensures reliable, fuss-free power management for everyday tech essentials.

Specifications

ASIN	B00TOVTZ7K
Amperage	0.5 Amps
Battery Charge Time	4 Hours
Best Sellers Rank	#1,390 in Our Brands ( See Top 100 in Our Brands )
Brand	Amazon Basics
Color	Black
Compatible Devices	Ipod
Connector Type Used on Cable	usb
Current Rating	0.5 Amps
Customer Reviews	4.5 out of 5 stars 33,020 Reviews
Global Trade Identification Number	00841710107548
Input Voltage	120 Volts
Item Dimensions D x W x H	4.5"D x 2.75"W x 1.5"H
Item Weight	104.32 Grams
Manufacturer	Amazon
Mfr Part Number	V-3299USB
Model Number	V-3299USB
Output Voltage	1.2 Volts
Product Dimensions	4.5"D x 2.75"W x 1.5"H
UPC	841710107548
Unit Count	1.0 Count

Reviews

I**S

11.01.2026

B**Y

26.01.2026

M**M

6.10.2025

A**J

21.02.2026

E**L

14.04.2026

B**S

21.01.2026

E**N

17.03.2026

A**Z

20.02.2026

R**É

26.01.2026

V**A

29.12.2025

O**S

12.03.2026

J**Y

13.02.2025

J**N

12.05.2025

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4257 som

Duties & taxes included

In stock

Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Kyrgyzstan.

Secure transaction

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Amazon Basics Rechargeable Battery Charger for AA & AAA Ni-MH Batteries with USB Port, Portable, Travel-Friendly, Over-Charge Protection, Black

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