CF-19 mk2 charger / battery issues

My 2nd hand CF-19 mk2 is charging extremely slow - around 6-7 hours for a completely discharged battery. The charger is "CF-AA1633A M2" and capable to spupply 3.75A @ 16V. I connected it to a power meter and shows a power consumption of 19W. If you take efficiency into account then we end up with a charging current only around 1A.
The Battery is not brand new either and only gives me a runtime of 90 minutes.
Is it likely to be the battery that is worn out? Or charger? Pr my beloved CF-19 itself?

 

Was the power meter on the AC 120v side?

I assume so. That means 19 watts at 120 volts which is 0.158333333 amps.
That gives you 1.05 amps on the AC side not 1.0 amps on the DC side.

120 volts at 1.2 amps equals 144 watts on the AC side. (Watts equals volts times amps.)

16 volts at 3.75 amps equals 60 watts on the DC output side.

If we figure that the wattage consumption is the same on AC and DC sides, we subtract the 19 watts from 60 and that gives us 45 watts left. Ohms law states amps equals watts divided by volts
The answer is 2.81 amps on the output DC side.

 

Yes. That's why I said you need to take efficiency into account.
The power meter is also TrueRMS capable and the power consumption explains the pathetic charging time. So I have no reason to not trust the readings.
Unfortunately I have no battery or charger I could easily swap out
Best guess would be battery nearly dead or?

 

If it is taking a longer time to charge, my first guess is a failing battery.

 

I edited my calculation.
I figure you are charging at 2.8 amps on the DC side.

 

If you are only getting 90 minutes on the battery then its time for a new one

 

There are a lot of CF-19 batteries on fleabay and they are fairly cheap.Heck I might have one.

 

taking efficiency into account ... 80% is a good ballpark number ... with the numbers provided it would seem that the problem is beyond the charger/ps .
i will take it that you had the machine powered down when you checked the input power (W or watts) .
inasmuch (and how often does on get to use that word ?) as switchmode supplies are basically of the work-or-they-don't nature (i would hazard 95% of the time) , this leaves the charging circuit and/or the battery to be at fault .

the charger/ps can be checked by hooking two single filament 12 volt lamps in series .
if the lamps are rated for 20W each then this will give a 10W load at 12VDC ...
sooo ...
10W/12VDC = .833A
.833A X 16VDC = 13W.
there will be a 13W load for those two lamps in series on a 16VDC supply .
(to get closer use the actual output voltage printed on the supply)
connect banks of the two series lamps in parallel to get up to the current level required .
trying to measure the dc resistance of a tungsten lamp is not easy ... the best one will come up with it the "cold resistance" which is nowhere near the hot resistance (think positive temperature coefficient) .
if one could find higher power lamps then it will be easier to place a decent load on the charger/ps .
a load of about 50% minimum would be acceptable but 90% load would be better .
place an ammeter in series with the output side of the supply to measure/prove the dc current .
there is another way to do this with fixed resistors of the correct wattage but most people do not have ready access to these items .

as the others have suggested , the battery would be the most likely culprit .
these have a much higher "heading south" rate than the charging circuit or ps .

 

Late to the party but CF-19 charging time is around 6 hours while machine is turned on and 3 hours while turned off.

While CF-19mk2 is very power hungry (at least mine is) you should get at least 200 minutes out of healthy battery doing most intensive tasks.

 

Hmm...can anybody confirm this? Do you have chance to use a watt meter? Even with the machine turned on and the battery charging I see a power consumption of around 37 W max.
If you take the efficiency into account then you will realize the PSU does supply only around half of what is really capable. Doesn't make sense at all to ship the unit with a power supply it cannot make use of (fully).
Also I agree with you that my mk2 runs very hot during use as well.

 

Here it is, right in the specs sheet:

POWER SUPPLY: Battery charging time: 4.5 hours off, 7.5 hours on

I'll make measurements later today.

 

Maybe from a dead battery but mine never took that long.

 

CF-19mk2, battery at 75%, wifi+BT on, backlight 50%

Idle - 36W
Idle no battery - 17W
Full load (Chrome game) - 47W
Off - 21W