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 recharge

🌍Worldwide voltage compatibility

🔌USB port for device charging

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Sold byAmazon HungaryDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Power up smarter, anywhere you go!

SMART SAFETY TECH - Built-in wrong polarity protection and auto cut-off prevent overcharging and extend battery life.
TRAVEL READY DESIGN - Slim, flip-down plug and 100-240V switching power make it your perfect global companion.
COMPACT LIGHTWEIGHT - At just 104g and 4.5 x 2.75 x 1.5 inches, it fits effortlessly in your bag or desk setup.
DUAL PURPOSE USB PORT - Charge your smartphone or iPod on the go with a convenient 0.5A USB output.
FAST EFFICIENT POWER UP - 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 handheld devices. Its compact, travel-friendly design supports worldwide voltage (100-240V) and includes safety features like wrong polarity protection and overcharge cut-off, making it an essential, reliable accessory for professionals on the move.

Specifications

ASIN	B00TOVTZ7K
Amperage	0.5 Amps
Battery Charge Time	4 Hours
Best Sellers Rank	#1,662 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 (33,136)
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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