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Review of Charger Nitecore Digicharger D4. Charger Nite. Core Intellicharger D4. This charger is based on a i. This makes it possible to charger more battery types than the i. The cardboard box lists lot of specifications, battery types and features. The box contains the charger, a mains cable, a manual and a warranty card.
The charger has two power connectors, one for mains input (1. VAC 5. 0/6. 0Hz) and one for 1. VDC input. The charger has two switches combined in one rocker: SLOT: Used to select slot, holding it down will turn the display off or on without affecting the charging. MODE: Used to change value displayed (Volt, m. A, time), with longer presseds it can also be used to select low charge current and Li. Fe. PO4. The charger has a large display with background light. The display looks good, but is a bit on the technical side.
The upper part of the display shows the four charge bays, the lower part shows the status for one bay. The actual bay is selected with the SLOT switch. The numbers will automatic switch between volt, m. A and time, but can also be switched with quick presses on the MODE switch. Holding the MODE switch for about one second will select "Low", i. A charge current.
Average charge current may be halved due to time sharing (Display will show 1. A in that case). Holding the MODE switch for about two seconds will select "Li. Fe. PO4", i. e. 3. Releasing the button and pressing again will select low current for Li. Fe. PO4. There is a small "Chg. Finished" text on the lower display, this is used on finished channels.
When all channels with batteries in are charged the charger will show "ALL" in the numeric display. Displayed charger currents (They will slowly reduce when entering CV phase of a Li. Ion charge): 7. 50m. A: The charge circuit is only charging one battery. A: The charge circuit time sharing between two batteries. A: The charge circuit is in low current mode and only charging one battery.
A: The charge circuit is in low current mode and time sharing between two batteries. The slots uses the usual construction and works well. They can handle batteries from 3. That excludes some of the longest batteries, especially some protected 2. The charger can handle 6. With 2. 6xxx batteries there is only space for one battery.
With C batteries there is a problem with the small button top sliding off the plus pole on the charger. A look inside the charger.
Nitecore asked me to show the inside of the charger: Four screws has to be removed to get into the charger. The display uses a long zebra connector between it and the circuit board. The background light is a separate module.
On the circuit board can be seen: A long isolation slot between the mains and the rest of the circuit. Mains input has a fuse, NTC, a noise suppression capacitor and uses a IC for controlling the mains switcher. Safety capacitor between mains and low volt side. The two inductors marked 1.
Measurements. Discharges Li. Ion with 0. 8m. A and Ni.
MH with 0. 1. 6m. A when not connected to power. With a empty battery the charger will try to activate it, then show "Err" after a short time. At 0. 8 volt the charger will assume Ni. MH and start charging. The charger will assume Ni.
MH below 1. 8 volt and Li. Ion above 1. 8 volt. Will not restart if battery voltage drops.
Charges with 0. 2m. A when Li. Ion battery is full. Voltmeter readout freezes when charging is finished. Voltmeter is within 0. Voltmeter has a max. Current readout is not average charge current. Charge will restart charging after power loss or battery insertion.
The button marked "SLOT" will change the display to the next slot with each press. The button marked "MODE" will change value displayed (Volt, m. A, time), with longer presseds it can also be used to select low charge current and Li.
Fe. PO4. C cells has a tendency to slide off the plus pole, i. It is difficult to fit more than one C battery at a time. The charger has two charge circuit, one is serving slot #1 and #4, the other is serving slot #2 and #3 using time sharing. Low current selection is seperate for each slot and is independend of time sharing.
When a charge circuit has batteries in both slots, in will use 7. When a slot is finished, the current is not redirected to the other slot in the group. Li. Ion charging.
The charger does a simulated CC/CV charger with a 5. A termination, this is fine. I do not know where the jump in current comes from, it does make the charging a bit slower, but does not affect the quality of the charging. The other channels has the same CC/CV curve. There is not much variation in charge time for the different capacities. Selecting low current mode will reduce the peak charge current to 3.
A, it does not change the terminaiton current. The old 1. 63. 40 cell, does also have a jump in current, here the reason is obvious: The voltage gets too high and the charger has to do a fast adjustment in the current. The 1. 83. 50 at 7. A works fine. The 1. A is also fine. With more batteries in the charger it will alternate between (time share) the slots and the effective charge rate is halved. Due to the low charge rate, there is not that much heat. When using the DC input the charger needs slightly above 0.
A. Notice the temperature is about the same with DC supply as with mains supply, i. M1: 3. 8,4°C, M2: 4. C, M3: 3. 8,6°C, M4: 3. C, M5: 4. 6,9°C, M6: 5. C, HS1: 5. 3,5°CM1: 3. C, M2: 3. 8,3°C, M3: 3.
C, M4: 3. 4,1°C, M5: 4. C, HS1: 6. 9,8°CInside the box it get fairly hot and this makes the DC connector hot. The charger need some time to start a charge, it first does a test, probably to reset any Li. Ion protection and detect Li.
Ion/Ni. MH. The charger measures voltage with current off. When a charge channel charges two batteries it will use 5. When a battery is put into a slot, all slots will pause for a few seconds. IFR (Li. Fe. PO4) charging.
Holding the MODE button pressed for about 2 second will switch to Li. Fe. PO4 mode. The charge voltage is too high, but this is not as critical with Li. Fe. PO4 as with ordinary Li. Ion batteries. The charge is a CC/CV charge with termination at about 5. A and no trickle charge.
The voltage is no accident, the charger is marked 3. Li. Fe. PO4 charge. Ni. MH charging. The Ni. MH charging stops on - dv/dt and do not use trickle charge. All channels works the same. The eneloop XX needs a bit more time.
I did the AAA cell at the low setting and it also terminated on - dv/dt. With - dv/dt termination it takes some time to detect a full battery, but this charger is very slow at it with 2. With four cells, the charge current is halved. Charging Ni. MH uses less current on the DC input, compared to Li. Ion cells, only about 0. A. M1: 4. 0,8°C, M2: 4. C, M3: 3. 9,8°C, M4: 3.
C, M5: 4. 5,1°C, M6: 4. C, HS1: 5. 4,3°CThe charger also uses a lower test current here, before it switches to the full charge current. Voltage is measured with current turned off.
When a charge channel charges two batteries it will use 5. Li. Ion+Ni. MH charging. With one Ni. MH battery and 3 Li.
Ion batteries, the charger has no problem with charging the Ni. MH (Temps sensor is on Li. Ion battery). With one Li.
Ion and 3 Ni. MH batteries, the Li. Ion is also charged fine (Temp sensor is on Ni. MH battery). Testing the mains input with 2. Conclusion. The charger does a good charging on both Li. Ion, Li. Fe. PO4 and Ni. MH. The charge can be used for 2.
I would have liked the slots 2 mm longer, some protected 2. I like the display, but it is a bit technical to look at and it only shows data for one channel at a time. The D4 is a good universal charger and the low mode makes it better for small cells than the i. Charging two batteries is reasonable fast, but four batteries requires some patience. Notes. The grouping of slots is not the same as in the i. The charger was supplied by a Nitecore for review.
Review of old i. 4 (V2)Here is an explanation on how I did the above charge curves: How do I test a charger.