Batteries charging while in use???

Cenobite9 · Feb 27, 2010

I have run into an odd situation: I have a 10x Blu-ray build with a version 4 flexdrive in an all aluminum host. The negative connection goes to the case. Now, I'm using standard Energizer lithium batteries (two AAA) in this host and I have noticed that the battery voltage has actually increased a bit after moderate use of the laser. I checked the batteries right out of the pack and they both measured in at 1.52v. After moderate use of the pointer the two batteries are now reading 1.617v. Is this normal behavior for a non-rechargeable battery??? I'm gonna keep a close tab on these batteries as I use the pointer to see if this continues. I don't want exploding batteries in my pointer afterall.

photonaholic · Feb 27, 2010

Never seen anything like that...... weird

ninja_tux · Feb 27, 2010

The only thing I could think of is that running current through it "woke up" parts of the battery that weren't active when you measured the voltage? That is very strange though...

Greenmechanic · Feb 27, 2010

Most primary (nonrechargeable) AAA batteries should be around 1.6V+ fresh from the pack. 1.5V or below, is considered discharged.
1.52V fresh from the pack does not sound right.
I don't think they will explode, as I also believe they just needed a "nudge" to produce the correct fully charged voltage.
BTW: If this continues, I want to buy that laser. I always wanted a "self-charging" IE: perpetual energy, laser.:wave::crackup:

Cenobite9 · Feb 27, 2010

That's comforting... eventually I will put a 10440+spacer in place of the two AAA's. Since those will charge up to around 4.2v it will definitely give me longer runtimes. Thanks for the info guys!

Cenobite9 · Mar 1, 2010

The batteries are definitely going down... after another night of hardy use by the club manager the Energizers are down to 1.502v. While on the subject of batteries are there any dangers to hooking up two 3.6v 10440s in parallel rather than using a single + spacer?

LarryDFW · Mar 1, 2010

Cenobite9 said:
While on the subject of batteries are there any dangers to hooking up two 3.6v 10440s in parallel rather than using a single + spacer?

You can hook up two 10440's in parallel;
if you have some additional space next to the battery.

It requires a flat metal band along the side of the battery and some insulating PVC heatshrink.

LarryDFW

Cenobite9 · Mar 2, 2010

Of course the real question would be how to charge such a thing since most chargers are made for single batts and not two stuck together. It'd be a pain to have to take apart the batteries every time I had to charge them unless I could leave them together and use wires to attach the plus and minus ends to the charger.

ff-racer · Mar 2, 2010

Cenobite9,

Energizer Lithium batteries (Non Rechargable) have a nominal voltage of 1.7 volts so they are .2 volts higher than alkaline.
It is just the nature of the chemicals used just as Nicad and Nickel-Metal Hydride are .3 volts lower at 1.2 volts
These DO have a much longer run time than alkaline and offer good performance.

Doug

Deleted member 8382 · Mar 2, 2010

^listen this. Having higher nominal voltage doesn't mean that they are gonna give you longer lifetime.

HIMNL9 · Mar 2, 2010

Have you considered that it can be due to temperature ?

Non rechargeable alkaline batterias sometimes change their voltage, increasing when heated, (til the point they start to become weak and decrease again, ofcourse) ..... if the fresh batteries was cold, when inserted, and then becomed more hot, also few degrees, this may justify the increasing of the voltage .....

ff-racer · Mar 2, 2010

These particular batteries are the best primary (one time use) batteries currently available. They can handle a much higher current drain compared to any other primary battery on the market. Their start out voltage just happens to be slightly higher. They are also incredibly light in weight. Energizer claims 10X run in digital cameras and a 10 year self life.
You sometimes see these labeled as "Photo" batteries.

Pilgor · Mar 2, 2010

when checking your batteries for amount of "life" you should check current if your testing just the battery because if there is no load so the voltage may not be a true result. If the battery has a load you can then check voltage to get true results. The reason the voltage would go up is because when you use your battery the amount of electrolytes changes, causing resistance to change.
V=I*R

Deleted member 8382 · Mar 3, 2010

what? I've always tested batteries "as they are", without loads...

Pilgor · Mar 3, 2010

ya you can check batteries voltage with no load, but the reading will not always be true results, batteries life is measure is mAH, mAH is actually the life span and therefore determines the amount of life. checking voltage will not always work because the multimeter may read 1.5v but as soon as you put a load on it, it will drop to maybe 1v, .8v etc....

HIMNL9 · Mar 3, 2010

Just put a 10 to 15 ohm, 5W, resistor, in parallel with your test leads, when you measure the battery (1,5V cells, ofcourse, not 12V batteries

), and you have an effective measure ..... and also, this way you can see if the batteries are "dead from storage" (when this happens, the battery measure full output without load, but with load, it constantly decrease, like, going to half volt or similar in 5 or 10 seconds)

Batteries charging while in use???

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