battery tester

[bestcounsel]

So, now that i am into this flashlight thing....i need a good battery checker...

I need battery checker to check 123 batts rcr123's 17500's aa,aaa' etc..

 

[old4570]

So, now that i am into this flashlight thing....i need a good battery checker...

I need battery checker to check 123 batts rcr123's 17500's aa,aaa' etc..

Multi meter .... Just check the voltage of the battery .

 

[march.brown]

There are some very cheap battery testers for AA and AAA batteries ... Mine has an analogue moving coil meter and the dial is marked replace , low , and good ... It has an arm that clips across the battery and you just read off the coloured dial ... It puts a load on the battery for testing purposes ... It works and is cheap off Ebay ... It also checks button cells.

As OLD4570 says, it is just a matter of measuring the Voltage on the Li-Ions ... There is a table showing a range of Voltage readings (open circuit) for rechargeable Li-Ion cells ... It gives the percentage capacity left for a given voltage ... For example 4.2V is 100% (full) , 4.0V is 80% , 3.9V is 60% ... It shows voltage readings down to 3.6V empty ... The table is on CPF somewhere ... I made a written copy for personal use though most of the regulars will know it off by heart.

Good Luck.

 

[AEHaas]

I have been using this one along with checking the voltage. It gives a really good idea of capacity as it puts everything under a load:

http://www.amazon.com/dp/B000FQG1XE/?tag=cpf0b6-20

aehaas

 

[bestcounsel]

I think multi meter is the best bet....to check to voltage reading?

 

[Light Sabre]

Just be careful of the really inexpensive battery testers. If the tester does not have a selector switch for the battery type don't buy it. I have one here that puts a big load on all battery types: D, C, AAA, AA, coin, button. So in otherwords all coin and button batteries test bad becasue the load is to high for them to handle. Radio Shack should sell one that has a selector switch. Probably around $15 or so.