what batery

[folharin]

friends, what you guys battery use in tgsl detector.I'm using 4 flashlight battery tactic 3,7vand circuit voltage regulator lm317

[folharin]

but not this much lasting charging them, only 1 hour

[pebe]

What is your regulated voltage?

[folharin]

11,99 volt

[raygdunn]

but not this much lasting charging them, only 1 hour

Hi

I think you are saying that the batteries only last for one hour between charges. If so, then looking at the "6800mAh" battery label, which is the largest figure I've seen for this battery type, I would say that your problem is cheap batteries. I recently bought some for a torch that were sold as 5000mAh. They were actually marked 5600mAh and in use are probably less than 1000mAh! You probably should be looking for 3000mAh or less and choose a reliable seller.

Personally I use an 11.1V LiPo 1300mAh pack. Mainly because I have them to hand for radio control flying. They are very light, but I wouldn't really recommend them. They are more prone to damage (plastic case) and have been known to catch fire or explode, when charging. (Probably down to previously damaged batteries or charging too fast, in my view). A quality cell balancing charger also essential. They also permanently lose capacity, if cooled, when fully charged! As such they need to be stored partly discharged to avoid overnight/winter temperature drops.

You are safer with your 18650s I would say.

I hope that helps.

Ray

[pebe]

Let's call it 12V. An LM317 requires its input voltage to be 2.0V to 2.5V higher than its output voltage in order to function properly. That voltage will be reached when each of the 4 batteries has dropped to 3.625V. If you assume the useful output of each cell to be from its fully charged state of about 4.2V down to 3.0V, then you are only discharging the battery to half its capacity.

A much more efficient way is to get rid of the regulator and use a switch mode boost voltage converter like this, and it will allow the full capacity of the batteries to be utilized.

http://www.ebay.co.uk/itm/2-24v-Inpu...nvSz1OQWoNKkDg

Arrange your 4 cells in parallel ((3.7V) or in a 2 x 2 series/parallel arrangement (7.4V) and set the converter output to 12V. BTW, you should use protected cells if you are fully discharging them in this way - if you over-discharge an unprotected cell it will be ruined.

I agree with raygdunn about cheap 18650s. It pays to go for something from a reputable manufacturer, like Panasonic.

[raygdunn]

Apologies folarin,

I failed to note your battery query was TGSL specific. My 11.1V LiPo setup was driving a lower voltaged circuit than a 12V one.

Ray