What is the difference between the c3100 and the c3400? is it just the car charger comes with the c3400? tyia

Some people responding to this question need to read more carefully. The question was about the difference between the C3100 and C3400 (NOT the C2400). The BT-C3400 can be bought with or without the car charger. Obviously, the one without the car charger is cheaper (but not offered on Amazon at this moment). Typically the BT-C3400 without the car charger is still a few dollars more expensive than the BT-C3100. As far as the charger itself, both models are *almost* identical, but supposedly intended for different markets. The BT-C3100 with the most recent firmware has a Lithium discharge cutoff voltage of 2.8 volts. The BT-C3400 has a discharge cutoff of 3.1 volts. Opus claims the change was made to be more in align with international standards. Some people also think that the 3.1 volt discharge cutoff is better for the batteries, but LiIon batteries should never be stored long term at either of these voltages. Be aware that both models have a hidden voltage selector switch under the back cover than will allow you to do a storage charge of 3.7 volts on standard LiIons. There is also a 4.35v charge mode setting that allows charging LiHV cells.

Can this charger be used with Netgear Arlo rechargeable batteries at 2300 mah wen 2000 mah looks like max output from charger?

The maximum battery capacity this charger can handle is 20,000mAh. This should not be confused with the maximum charging current of 2000mA.Note that Capacity (mAh) = Current (mA) * Time (h). That means to recharge a 20,000mAh battery at 2000mA will take ~10 hours.

Does this have the ability to test batteries strength? not just good/bad but how many volts and amps it will put out

It has quick test which I believe is the battery impedance. Multiply the battery impedance times the current draw of your application. The result is the voltage drop internal to the battery. If that number is significant, like more than about a few % of the battery voltage the loss will heat up the battery. The most discharge current is 2000 mA or 2 Amperes.

Which version currently ships? v3.1, as in bt-c3400?

The one I got has this on the label : Under the upc barcode: X0014AV9TH Part number : Opus BT - C3100 V2.2 Dig... - US Plug (Purplish Blue) The case, the plug and the cable are all black. The only thing I can see that would relate to the purplish blue reference is the color of the LCD screen once it is plugged in to the power outlet. Otherwise the entire physical charger cable and plug are all black. It works great for me.

Item Weight	0.52 Pounds
Item Dimensions D x W x H	1.54"D x 3.86"W x 5.67"H
Current Rating	3 Amps
Input Voltage	240 Volts
Output Voltage	12 Volts
Color	purple

Opus BT - C3100 V2.2 Universal Battery Charger Speedy LCD Display Smart Battery Charger for Rechargeable Batteries Ni-MH Ni-Cd AA AAA,3.7V Li-ion 18650 26650 17670 14500 18490 (4-Slot)

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