[HKJ]

Dlyfull M8 Battery Charger





This is 8 channel charger from Dlyfull that can charge most battery types.






The charger arrived in a brown cardboard box with a drawing of the charger and a list of supported batteries.



The box included the charger, a 12V power supply and a manual.



The charger is powered from the supplied 12V supply.



The power adapter is rated for 12V 3A.



The user interface contains 2 buttons and a LCD display.
When a LiIon battery is put into a slot a short press on the MODE button will select voltage.
Holding down MODE during operation allows selection of current, this make is a bit cumbersome to change current.
SLOT is used to select battery.
Holding down SLOT will restart slot with a new LiIon voltage selection.



All segments



Charging a LiIon battery in slot #2.



Charging a NiMH battery in slot #5.



The back has the usual specifications, but is rather hard to read.



The connection are the common slider style that can handle from 31mm to 77.8mm, this handles all normal sizes of LiIon and NiMH cells, protected or not.



There is also connectors for two 9V batteries. They do not use the display, but have a red/green led each. It shows red while charging and green at all other times.












Measurements charger

[index=16]

• When not powered it will discharge a LiIon battery with about 1.2mA
• When powered the charge will charge with about 1.0mA when finished.
• Between 0.0V and 1.5V the battery is assumed to be NiMH.
• Between 1.5V and 2.0V the charger will report Err
• Above 2.0V the battery is assumed to be LiIon.
• Charger will not restart if battery voltage drops.
• Voltmeter do not show correct below 0.9V
• Voltmeter is within 0.02V when in range.
• Slot #1 & #8 can charge with 0.2A, 0.5A, 0.8A, 1A & 2A for LiIon, but only up to 1A for NiMH
• Slot #2, #3, #4 & #5 can charge with 0.2A, 0.5A, 0.8A & 1A
• LiIon can charge two batteries at 2A, 6 batteries at 1A or 8 batteries at 0.8A
• NiMH can charge 8 batteries at 1A
• Background light will reduce brightness when no buttons are used, but display is still readable.
• Power consumption when idle is 0.32 watt (Power supply is 0.07 watt)

Charging LiIon 4.2V



The charger has a nice CC/CV charge curve and about 100mA termination current.
Display shows: 3119mAh



Display shows: 3096mAh



Display shows: 3066mAh



Display shows: 3110mAh



Display shows: 3095mAh



Display shows: 3078mAh



Display shows: 3212mAh



All slots look similar.
Display shows: 3191mAh



Display shows: 2626mAh



Display shows: 2853mAh



Other capacities looks fine.
Display shows: 2158mAh



The 14500 cell also looks fine.
Display shows: 1005mAh



Any cell can be charged with 0.2A, but it can take a long time.
Display shows: 3119mAh



No problem with my old and very worn down cell.
Display shows: 74mAh



Increasing the current to 1A works fine.
Display shows: 3168mAh



2A also works fine, the termination current is unchanged.
Display shows: 2976mAh



With 8 cells the maximum charge current is 0.8A
Display shows: 3010mAh, 2746mAh, 2938mAh, 3062mAh, 2948mAh, 3044mAh, 3041mAh, 3084mAh



And the charger can use up to 3A from 12V
Display shows: 2872mAh, 2879mAh, 3061mAh, 2620mAh, 2967mAh, 2963mAh, 3077mAh, 2974mAh



HS1: 52.2°C



M1: 35.9°C, M2: 36.5°C, M3: 38.3°C, M4: 38.4°C, M5: 36.8°C, M6: 36.6°C, M7: 34.9°C, M8: 31.9°C, M9: 41.2°C, HS1: 43.8°C



The charger needs about 10 seconds to turn on, partly because it waits for user input.



A full LiIon battery will be discharged with 1.3mA when the charger is without power.



Charging LiIon 4.35



Using 3.8V setting will charge to 4.35V
Display shows: 2971mAh



Charging LiIon 3.6V



The LiFePO4 setting charges to 3.65V
Display shows: 1225mAh



Charging NiMH



This NiMH charging looks like a voltage termination, there is a small trickle charge.
Display shows: 1880mAh



Display shows: 1992mAh



Display shows: 2158mAh



Display shows: 2127mAh



Display shows: 1930mAh



Display shows: 1949mAh



Display shows: 2046mAh



The other slots looks like -dv/dt termination
Display shows: 1975mAh



Display shows: 2649mAh



Display shows: 2556mAh



With the high capacity cells there are tow -dv/dt and one voltage termination and all batteries looks full.



The AAA cell is handles nicely on 0.5A
Display shows: 778mAh



The charger also terminated A AA NiMH with a 0.2A charge, but was a bit slow to do it.
Display shows: 2586mAh



Oops, for some reason the termination do not work this time around. Using 0.2A for a AAA cell is on the low side, there is no -dv/dt signal on the charge curve.
Display shows: 5696mAh



Termination on a full cell can be a bit slow.
Display shows: 259mAh



Using 1A works fine.
Display shows: 1894mAh



Charging 8 cells at 1A also works fine.
Display shows: 1825mAh, 1791mAh, 1841mAh, 1910mAh, 1821mAh, 1892mAh, 1854mAh, 1838mAh



It uses nearly 2A peak from the 12V supply.
Display shows: 1765mAh, 1763mAh, 1793mAh, 1811mAh, 1800mAh, 1835mAh, 1841mAh, 1839mAh



HS1: 65.6°C



M1: 34.7°C, M2: 38.2°C, M3: 39.1°C, M4: 38.0°C, M5: 37.8°C, M6: 36.8°C, M7: 34.0°C, M8: 30.7°C, HS1: 50.0°C



The charger is considerable faster to start with NiMH, it do not have to wait for user input.



The trickle charger is current pulses. On time is 2 seconds every 20.5 seconds with an average current of 60mA, i.e. the trickle charge current is about 6mA. This is a acceptable level.


Charging 9V




The current is about 30mA.



The 9V also uses pulsing current and can deliver nearly 11V, current is fairly constant at any voltage.


Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.



Conclusion

The charger works nicely charging the different battery types and has a wide selection of current available, but it is not really a super fast charger. Changing current is a bit on the slow side, especially with LiIon where you have to wait until the voltage selection times out and then hold down the button to enable current selection.

I will rate it as a good charger, even though it failed on a single NiMH cell.



Notes

The charger was supplied by a DlyFull for review.

Here is an explanation on how I did the above charge curves: How do I test a charger