[Review] Rugged smartphone Oinom LMV9

[Matjazz]

Li-Ion batteries are safe to deplete to 2,8V and I was curious about the battery voltage when it gets depleted and the phone shuts down. It was 3,49V. Then I measured empty battery of Lumia 520 and it showed 3,5V Perhaps phones let battery deplete only to 3,5V to prevent from depleting beyond safe point too soon if the phone is left unattended.


The phone takes some time (8h) to charge its 4,5Ah battery and I was wandering if a better USB charger would charge it faster. I then measured the current that phone draws from USB charger. The Lumia 520 draws 1A and is charged in a couple of hours (1,43Ah).
It's a disappointing that this phone draws only 0,47A. Considering that the smallest battery it can adapt has 2,8Ah it could easily charge at a double rate. Too bad it doesn't.
Also the charging isn't constant. It regularly drops to 0A for a split second. This happens every 5 seconds or so. I don't know whether this is common to Android phones or MTK phones. Lumia 520 charges at 1A constantly.