What is the difference between this BT-C2400 with the BT-C2000 unit?

I have the BT-C2400 and it only charges the AA and AAA NiMh batteries. I don’t know what the BT-C2000 unit does.

with the opus bt c2400 what reading tells me that the battery is dead and no longer able to hold a charge worth using in my speed light flash?

I don't know if it has a "dead" battery code. However, it will tell you what the current charge is in mAH. For example my AA batteries are 2300 mAH. However, after battery charges the display will tell me that it was able to charge the batteries to 1800 mAH. I assume when it hits below 900 mAH (50%), it is time to change them out. There is a refresh+charge mode. I have done this a couple of times and it made a difference. i.e current full charge is 1000 mAH, after refresh full charge is 1800mAH. Hope this helps.

Is there any other difference between the bt-c 2400 and the 3400 besides the ability for the 3400 to charge lithium batteries? thanks

The ability to charge Li-ion for the C3400 is the big difference. They use basically the same charge algorithms for NiMH cells. The C3400 also has greater charge current capability. It can charge at 2000 mA on two channels.

Does it allow to charge nearly drained batteries (with the low voltage left, less than 0.5v) or still reports "null" on them, like its predecessors?

You can put 0V batteries into a dumb charger, and if they can take a charge, 10 - 15 mins should be sufficient to put in enough charge to be recognized by a smart charger. However, more often than not, batteries measuring 0V will have some issues, and even if they can be charged up, they may not be able to hold a useful amount of charge.

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BT-C2400 Battery Charger Analyzer Tester for AA AAA NiMH NiCd Rechargeable Batteries

Product ID: 8897876

Details

Brand
OPUS
Current Rating
1400 milliamps
Input Voltage
240 volts
Item Weight
8 ounces
Output Voltage
12

⚡Adjustable charge current up to 1400mA

📊Backlit LCD with real-time battery stats

🔋4 independent charging channels

€ 77.16

Duties & taxes included

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Sold byAmazon NetherlandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔌 Charge smarter, last longer — the ultimate battery revival station!

PORTABLE VERSATILE - 12V DC powered with included car adapter—perfect for professionals on the go or managing multiple devices.
REVIVE REFRESH TECH - Advanced refresh and discharge cycles breathe new life into old or tired batteries, saving you money and waste.
QUAD CHANNEL POWERHOUSE - Simultaneously charge, test, and refresh up to 4 AA/AAA NiMH or NiCd batteries with full independent control.
DATA DRIVEN BATTERY CARE - Monitor voltage, capacity (mAh), current, and elapsed time on a crisp backlit LCD for precision management.
CUSTOMIZABLE CHARGE RATES - Fine-tune charging current from 200mA to 1400mA per channel to optimize battery longevity or speed.

The OPUS BT-C2400 is a professional-grade smart charger and analyzer designed for AA and AAA NiMH/NiCd rechargeable batteries. Featuring four independent channels, a backlit LCD display with detailed battery metrics, and adjustable charging currents up to 1400mA, it offers comprehensive charge, discharge, refresh, and test modes. Ideal for tech-savvy users and professionals, it excels at restoring older batteries and optimizing battery health with precision and versatility, all in a rugged, portable design powered by 12V DC.

Specifications

ASIN	B00MYQ8IYS
Amperage	1400 milliamps
Brand	OPUS
Compatible Devices	Adapter, Sensors
Connector Type Used on Cable	DC power jack
Current Rating	1400 milliamps
Customer Reviews	4.7 4.7 out of 5 stars (724)
Input Voltage	240 volts
Item Weight	8 ounces
Manufacturer	Opus
Mfr Part Number	BT-C2400
Model Number	BT-C2400-US
Number of Ports	4
Output Voltage	12 volts_of_direct_current
UPC	727908590708
Unit Count	1 Count

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