Test/review of battery tester ZTS Mini-MBT

4 posts / 0 new
Last post
HKJ
HKJ's picture
Offline
Last seen: 2 days 3 hours ago
Joined: 05/24/2011 - 12:23
Posts: 7448
Location: Copenhagen, Denmark
Test/review of battery tester ZTS Mini-MBT

Test/review of battery tester <span class="caps">ZTS</span> Mini-<span class="caps">MBT</span>


Battery tester ZTS Mini-MBT
DSC_9204
The ZTS tester is fairly advanced battery testers that uses some sort of pulse test. This is one of the smaller models. I will see how good it is, how it do its magic and how it is build.
DSC_9202 DSC_9203
This model includes a small bag for it.
DSC_9208
The front has one connection for a couple of battery sizes.
DSC_9205
DSC_9206
The other connection is hidden in a slot on the device (A neat solution).
DSC_9207
There is also a power button on the box, a press will turn the device on for some time, power off is always automatic.
DSC_9383
When a battery is connected the lights run left and right a couple of times, before a single led lights up showing the estimated remaning energy.
Measurements


  • Power consumption when on and idle is 17.5mA
  • Power consumption when off is below 1uA
  • Power consumption when testing is 31mA
  • Power consumption when showing result is 78mA (The relay is using a lot of power).
  • Power on time is about 2 minutes
  • Works down to about 4 volt on the internal batteries.
  • The power led will flash when internal batteryes are too low.

Alkaline
To test the tester I discharged a AA alkaline battery in 100mAh steps and put it on the tester for each step (I discharged with 100mA).
Each time I checked the state on the ZTS I did multiple tests, if the tester changed between two values I recorded a value between, i.e. a indication of both 60% and 80% was recorded as 70%.
The dots above shows the ZTS indications, the green line is the correct remaning capacity.
This curve was done over two days, this means the battery got a lot of rest time at some of the measurement points.
NiMH
I did the same test with a NiMN, (2000mAh Eneloop discharged with 500mA).
As expected it is very difficult to measure charge state of NiMH batteries.
Alkaline-AA
The pulse loading is one 2 second pulse at around 150mA for alkaline batteries.
NiMH-AA
With NiMH the current is 350mA and the pulse is slightly longer.
LiIon-18650
LiIon batteries are pulsed with 700mA
Because there are different LiIon chemistries with different voltages, this cannot be very precise.
Lithium-CR123
And CR123 is pulsed with 750mA
Tear down
DSC_9349
It was easy to open, I just had to remove a couple of screws, but removing the circuit board required desoldering the two connections to the battery box.
DSC_9353
The 5 level leds (D1 to D5) are smd leds and marked with the color. There is also a power led (D6).
Q1 is used to drive the relay and Q3 is probably used together with the power switch.
Z1 may be the reference.
It can also be seen that the circuit board can be used for another MBT model (There are holes for some other battery terminals).
DSC_9352
On this side is the microprocessor (U1: PIC16F1507), the load resistors and a relay to disconnect the loads.
DSC_9354
DSC_9355
Conclusion
The device is not a precision meter, but it can give an idea about the power remaning in a battery
Compared to many other battery testers it has the advantage of a well controlled load, both current and time.
Notes
I got the device from a reader.
Here is some voltage tables for estimating remaning energy in LiIon batteries

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

MRsDNF
MRsDNF's picture
Offline
Last seen: 3 months 3 weeks ago
Joined: 12/22/2011 - 21:18
Posts: 13473
Location: A light beam away from the missus in the land of Aus.

Thanks HKJ and to the reader who sent it to you for testing.

 

djozz quotes, "it came with chinese lettering that is chinese to me".

                      "My man mousehole needs one too"

old4570 said "I'm not an expert , so don't suffer from any such technical restrictions".

Old-Lumens. Highly admired and cherished member of Budget Light Forum. 11.5.2011 - 20.12.16. RIP.

 

SubLGT
Offline
Last seen: 23 hours 5 min ago
Joined: 12/08/2014 - 12:42
Posts: 288
Location: Idaho, USA
Quote:
…..it is very difficult to measure charge state of NiMH batteries.

Why? Just curious.

HKJ
HKJ's picture
Offline
Last seen: 2 days 3 hours ago
Joined: 05/24/2011 - 12:23
Posts: 7448
Location: Copenhagen, Denmark
SubLGT wrote:
Quote:
…..it is very difficult to measure charge state of NiMH batteries.

Why? Just curious.

Because the voltage du not vary much during discharge. At the start it drops to 1.25V and then it stays there for most of the discharge.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/