Review: cheap 18650 mobile power bank

WarHawk-AVG · March 27, 2014, 9:52pm

bluey:

I also informed the shop where I bought it (eBay Shop from “keyzone”) with a link to there, also to get a refund for the black one that was defective after 5mins.

I would guess that nobody really gets hurt, or rather equally bad for both chips. Only the battery cells will get damaged with the FM6316 because of the discharge issues, but they won’t get shortcircuited or overcharged. At least from the current information we have. Of course both of these chips/designs could still have some other issues. When looking at the poorly detailed datasheets it looks like “anything could happen” ….

// Edit: Ok afterall the datasheet of the FM6316 seems to be actually more detailed than the ETA one, at least what you are showing here and what I found for the ETA. And like you said, maybe poor implementation, wrong current limiting resistor? I will check mine at another time…

That’s what I don’t understand…per a translation of website pertaining to the FM6316CE

First, an overview
FM6316 is a software application for mobile power supply , the integrated lithium battery charger, DC-DC converter step-up current-limiting, and load testing functionality in one portable power management IC.
FM6316 integration including trickle charging, constant current and constant voltage charging charging charging mode, the system closes the output in a charged state discharge path, when the external input to the power supply when removing, FM6316 powered from battery to external devices, if there is no external device access is detected, the system enters the standby state, the entire system standby current 16uA. Constant current charging current and voltage boosting current value by external resistor programmable.
FM6316 has multiple protection design, including load over current protection, charging anti-flooding protection, short circuit protection, soft-start protection, overtemperature and undervoltage protection. Where FM6316BE is the limit of, FM6316CE is an open-ended flow, discharge current maximum is 1 a.

Second, characteristics
Simple peripheral circuit;
No load testing shutdown;
Standby current 16uA;
Constant-current/constant-voltage trickle/three-stage charging;
IC boosting efficiencies up to 90;
Boost current limiting output;
Load flow and short circuit protection;
Constant current charging current values can be externally programmed;
Boost limit value can be set by an external program;

Third, the package:
FM6316BE and FM6316CE in the SOP-8 package, FM6316E ESOP-8? Yu? br/>
IV product application
Mobile power supply;
IPAD and other digital equipment power backup.

If it was working as designed these chips “should” thermal/current limit to 1A and charge the li ion with the correct CC/CV…but alas…it appears that either a bad design or bad components on the board…unknown at this time till someone with ALOT better test equipment can see just what these boards are doing…hmmmm

So far all 4 of my other FM6316CE driven boards are doing what they are supposed to do on charge…all of them give blue on full charge, using one of those .36” voltmeter I get 4.2 on the readout, and on power out they run whatever device just fine and don’t get warm, the one black one however smoked after a few hours (I need to get a USB doctor module)

I am getting one of these for sure…maybe 2 or 3
http://www.dx.com/p/usb-av-usb-power-current-voltage-tester-translucent-blue-silver-235090?r=43033281
Give me something for easy volts/amps diagnostics

BLF review thread