mAh Tester

[old4570]

I saw in one of the threads a battery tester that showed mah-charge in the batt , is it a load tester ? and where can you get one .
:tinfoil:

 

[Marduke]

A battery charger with a "test" or "analyze" function is what you want. The LaCrosse BC-900 and Maha C9000 are two of the most common.

 

[old4570]

Yeah , there AA and AAA ...

What can you use for CR123A and 18650 ?

Im interested in something like in the picture . Looks Choice !

 

[rmteo]

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXEYD4&P=ML

Hobbico AC/DC Accu-Cycle Elite Battery Cycler
Input Voltage: 11-14.5V DC
AC Power Supply: 110V AC 60Hz input, 14.5V DC 2.5A output
Number of Output Ports: two
For BOTH Outputs:
Battery Types: Nickel-Cadmium (NiCd), Nickel-Metal Hydride (NiMH)
Lithium Polymer (LiPo), Lithium-Ion (Li-Ion)
Number Cells: 1-10 NiCd or NiMH (1.2-12V)
1-3 LiPo or Li-Ion (3.6-11.1V)
Fast Charge Current: * 50-2000mA
Fast Charge Termination:
NiCd/MH -"negative deltaV'" Peak Detection,
LiPo -"Constant-Current/Constant-Voltage" (4.2V/cell max.)
Li-Ion -"Constant-Current/Constant-Voltage" (4.lV/cell max.)
Peak Detection Sensitivity: 3-15mV per cell adjustable
Fast Chg Safety Timer: * automatically calculated
TRICKLE Charge Current: * 0-200mA
Peak Detection Delay: 3 minutes
Discharge Current: 50-2000mA
Discharge Cutoff Voltage:
* 0.8-1.2V per cell adjustable for NiCd & NiMH
3.7V per cell fixed for Li-Ion and LiPo
Cycle Count: 1 to 5 (NiCd and NiMH only)
Cycle Delay- Chg/Dsch: 10 minutes
Status Indicators: two tri -color LEDs (Red/Amber/Green)
Optional Temp. Cutoff: ** 60-130°F (15-54°C)
Output Connectors: banana jacks
Battery Memories: ten
Display Type: 2-line, 16 character LCD

 

[65535]

The only way to truly tell the capacity left in a cell is to completely discharge it using a meter inline that is able to measure both voltage and current constantly to give a mA/h reading.

Doing this to a primary cell will render it useless.

In order to perform a discharge or charge test you need a hobby type charger they normally have a meter built in. There is a CBA battery analyzer that is designed for the sole purpose of discharging batteries and collecting information that is uploaded to a computer for interpretation.

There is a ZTS tester out there that does a decent job of quickly loading the cell and estimating the capacity left. Although you'll notice the accuracy levels are in the 20% of full scale, and they aren't 100% reliable it estimating the charge.

There is also a device called a watts-up meter which is good for 0-60V and 0-100A and will record Ah, Wh, voltage, and current for the duration of time that power is pulled through the circuit. They are around $60 I think.

 

[xpea]

I saw in one of the threads a battery tester that showed mah-charge in the batt , is it a load tester ? and where can you get one .
:tinfoil:

Hello,

I believe you are thinking about my small tester I showed with Panasonic 2900mah NCR18650. These can be easily find in small Chinese electronic shops for 15.00 USD. If you want it, PM me, I can send you one

 

[old4570]

PM sent .

 

[Kremer]

The 'GY568+' labeled box looks interesting, the only references I can find for it on the web are in Chinese.

 

[VegasF6]

Xpea, I must admit that caught my eye as well.
It got me looking around at this which led me to this.

But, I wonder if you were able to buy those (the gy568+) in bulk and offer them how many members would be interested? I am pretty sure I would be.

I have asked in another thread how I could test a lithium cell capacity and I didn't get the results I wanted.

P.S.
Curious what the end voltage is of the battery after discharge with that device? Does it just discharge until the pack isn't able to supply the load, 500 mA or 1A? Regardless of the pack voltage?