Hmmm. The Zenithink Upgrade models use AML8726-M3 chip. Seems Amlogic changed these chips to work @ lower voltage. The M1 were 7.4V. The M3 appear to be 3.7V. Must now support mobile RAM instead of standard RAM chips. ie, lower voltage RAM chips.Be careful, the new Z102 upgrade use 5V charger now. not 9V like before.
I did not checked and I charged my new unit with my old Z102 charger, realizing after that they have different voltage...
No, before it was 2 X 3500mAh(3.7V) = 3500mAh @ 7.4V, ie connected in series.Another thing i have noted, they have put smaller battery inside the tablet, half the size of what it was before. Before it had 2 x 7.2V 3500mah battery in parallel to get 7000mah.
Or just one massive 6KmAh single cell would solve the problem.No, before it was 2 X 3500mAh(3.7V) = 3500mAh @ 7.4V, ie connected in series.
With 1 battery, it likely is 3500mAh @ 3.7V.
Stored Energy = Wh (watt hours) = [email protected] = [email protected] = 25.9
The AML8726-M1 runs @ 7.4V and probably uses standard RAM chips. For that reason, it would have used more power over time.
The AML8726-M3 runs @ 3.7V and must use mobile RAM. For that reason, it will run about 2 hours longer on the same battery size as the M1. So, Zenithink probably decided to cut their cost down by using single battery only.
So, by going to 1 X [email protected], Zenithink halved the battery's stored energy but since chip now runs @ 3.7V it gained about 2 hours extra battery time.
ie, if battery time with original was 5 hours you would now get 5/2 + 2 = 2.5 + 2 = 4.5 hours of use.,etc. ie, So, battery life is lost by going to single battery. 2 X 3500mAh batteries in parallel would have made the Upgrade tablet run for about 10 hours.