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

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 Volts (DC)

⚡Adjustable charge rate up to 1400mA

📊Backlit LCD shows voltage, capacity & time

🔋4 independent charging channels

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Description

🔌 Charge smarter, last longer — the ultimate battery care station for pros.

PRECISION ANALYTICS - Real-time digital readout of voltage, capacity (mAh), current, and elapsed time for each battery slot.
BATTERY REVIVAL MODE - Refresh and restore old or tired NiMH/NiCd batteries to extend their lifespan and save money.
VERSATILE PORTABLE - 12V DC powered with included car adapter, rugged design with temperature sensors for safe, on-the-go use.
QUAD CHANNEL POWERHOUSE - Simultaneously charge, test, refresh up to 4 AA/AAA batteries with full individual control.
CUSTOMIZABLE CHARGE RATES - Set charge current from 200mA to 1400mA per channel to optimize battery health and speed.

The OPUS BT-C2400 is a professional-grade smart charger and analyzer for AA/AAA NiMH and NiCd rechargeable batteries. Featuring four independent channels, it offers customizable charge rates up to 1400mA, a backlit LCD displaying detailed battery metrics, and advanced modes including charge, discharge, refresh, and test. Designed to revive old batteries and extend their life, it’s powered by 12V DC with a car adapter included, making it ideal for tech-savvy users who demand precision and versatility in battery maintenance.

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 (718)
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 (DC)
UPC	727908590708
Unit Count	1.0 Count

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Sold byAmazon Sri LankaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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