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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OPUS BT-C2400 Battery Charger Analyzer Tester for AA AAA NiMH NiCd rechargeable batteries

OPUS BT-C2400 Battery Charger Analyzer Tester for AA AAA NiMH NiCd rechargeable batteries

Product ID: 589212096

Details

Brand
Opus
Colour
Black
Input voltage
240 Volts
Item weight
227 g
Output voltage
12 Volts

⚡Up to 1400mA adjustable charge current

📊Backlit LCD shows capacity & voltage

🔋4 independent charging channels

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VT38134

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Description

🔋 Power up smarter, not harder — the ultimate battery care station for pros.

ON THE GO READY - 12V car adapter compatible for professional-grade battery management anywhere, anytime.
SMART CHARGING TECH - Negative delta V detection and 16-bit ADC ensure safe, optimized charging every cycle.
QUAD CHANNEL POWERHOUSE - Simultaneously charge, test, and refresh up to 4 AA/AAA batteries with full individual control.
VERSATILE BATTERY REHAB - Charge, discharge, refresh, and test NiMH & NiCd batteries to extend lifespan and performance.
DATA DRIVEN BATTERY CARE - Backlit LCD delivers real-time capacity, voltage, current, and elapsed time for precision monitoring.

The OPUS BT-C2400 is a professional-grade battery charger and analyzer designed for AA and AAA NiMH/NiCd rechargeable batteries. Featuring four independent channels, a backlit LCD for detailed battery metrics, and advanced charging modes including discharge and refresh, it maximizes battery health and lifespan. With adjustable current up to 1400mA and car adapter compatibility, it’s engineered for precision, versatility, and convenience in battery maintenance.

Specifications

ASIN	B00MYQ8IYS
Amperage	1400 Milliamps
Best Sellers Rank	#136,360 in Electronics ( See Top 100 in Electronics ) #162 in Household Battery Testers
Brand	Opus
Color	Black
Current Rating	1 Amps
Customer Reviews	4.7 4.7 out of 5 stars (680)
Input Voltage	240 Volts
Item Weight	0.5 Pounds
Mfr Part Number	BT-C2400
Model Number	BT-C2400-US
Number of Ports	4
Output Voltage	12 Volts
UPC	727908590708
Unit Count	1.0 Count

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VT38134

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In stock

Sold byAmazon VanuatuDelivered 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 Vanuatu.

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