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.

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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

Product ID: 19922174

Details

Brand
Amazon Basics
Color
Black
Item Weight
104.32 Grams
Output Voltage
1.2 Volts
Product Dimensions
4.5"D x 2.75"W

⚡4-hour fast charge

🌍Worldwide voltage compatibility

🔌USB port for device charging

4290F

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Sold byAmazon French PolynesiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Power up anywhere, anytime—because your devices deserve the best.

SAFETY FIRST - Built-in wrong polarity protection and automatic cut-off prevent overcharging and extend battery life.
TRAVEL READY DESIGN - Slim, flip-down plug and 100-240V switching power for seamless global use.
COMPACT LIGHTWEIGHT - At just 104g and pocket-sized, it’s the perfect companion for busy professionals on the move.
DUAL PURPOSE USB PORT - Charge your smartphone or handheld device on the go with a 0.5A USB output.
FAST EFFICIENT CHARGING - Recharges 2 or 4 AA/AAA Ni-MH batteries in just 4 hours—never miss a beat.

The Amazon Basics Rechargeable Battery Charger efficiently powers AA and AAA Ni-MH batteries in 4 hours, featuring a USB port for charging mobile devices, worldwide voltage compatibility, and advanced safety protections—all in a compact, travel-friendly design.

Specifications

ASIN	B00TOVTZ7K
Amperage	0.5 Amps
Battery Charge Time	4 Hours
Best Sellers Rank	#1,568 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 4.5 out of 5 stars (33,241)
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
UPC	841710107548
Unit Count	1.0 Count

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4290F

Duties & taxes included

In stock

Sold byAmazon French PolynesiaDelivered 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 French Polynesia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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