Thoughts on batteries .....

[mzeitlin3348]

Just curious if I am calculating correctly.
Assuming linear discharge - my TV remote reported 43% charge left in AA batteries.
When I measured their voltage - they were at 1.3 volts. Full charge (alkaline) is 1.5 volts.

What would the voltage be at "zero" charge? I calculate 1.03 volts.

From 1.5 v to 1.3 v the batteries lost 57% of their charge.
Is this a correct way to think about this? Just curious.

I did notice that when I put fully charged rechargeable batteries in the remote (1.45v), the TV reported only 80% charge.

 

[old_tv_nut]

Depends on battery technology, rate of discharge, number of previous charge/discharge cycles.
The charge estimator in your TV remote is based on a particular technology. Since the rechargable batteries will have a lower voltage for a long time, they will indicate 80% percent charge for a long time before dropping off. In other words, the 80% number is not a true reading of the charge left.

https://qnovo.com/119-explaining-apple-must-shamefully-throttle-old-iphones/

 

[El Rubio]

I wouldn’t trust the circuit in the remote to be very accurate. On my sailboat, I had a battery monitor that monitored battery bank voltage, discharge current, rate, temp, etc. it would constantly calculate the ‘usable’ time left at that discharge rate. It would also measure incoming current during charge cycles. This was a better method of calculating capacity than just measuring voltage. Capacity will vary with current draw. Usually, batteries can deliver more amp-hrs at low discharge rates than high rates.

 

[egellings]

A good place to go for all things battery is www.batteryuniversity.com.

 

[Quadman2]

A good place to go for all things battery is www.batteryuniversity.com.

I don't want to bump this thread, but I have a battery concern that is battery related. And, even after reading most the the url that was shared by EL, I'm still up in the air as to being sure of the answer to my concern.

Here's my question: Does it do harm to a portable device to leave it permanently on a charger when using it?.

The item in question is a bluetooth speaker, of which I think makes use of a rechargable Li-on battery. The device is supposed to shut down if left unattended for a certain period of time, and also wondering that if plugged in it might bypass this turn off feature.

I suppose my question is really two part, but interrelated just the same.

Q

 

[egellings]

Look that question up on batteryuniversity.com. The answer to your question depends on the battery chemistry of your battery. Some are harmed by being on constant charge, others don't care.

 

[old_tv_nut]

Look that question up on batteryuniversity.com. The answer to your question depends on the battery chemistry of your battery. Some are harmed by being on constant charge, others don't care.

This.

Plus, it's not only a matter of lithium ion vs.other types, but different materials (the particular electrode structures and electrolyte) in different lithium ion batteries. Follow the equipment makers instructions, if they give you any. If not, you just have to wing it. A decent charging circuit designed for the actual supplied battery, will generally protect the battery against terrible deterioration even if left on continuous charge, but if no info is provided, and the device has a charge indicator, keeping the charge between 25% and 75% *might* be the best policy for long life.

Every time a manufacturer starts to use a newly modified battery chemistry, they are starting a new life test experiment, which can only be partially accomplished in the lab before the customers become the guinea pigs.

 

[nasadowsk]

Every time a manufacturer starts to use a newly modified battery chemistry, they are starting a new life test experiment, which can only be partially accomplished in the lab before the customers become the guinea pigs.

That's why buying new batteries can be, for some people, be a tough cell

 

[NH-MAN]

Just curious if I am calculating correctly.
Assuming linear discharge - my TV remote reported 43% charge left in AA batteries.
When I measured their voltage - they were at 1.3 volts. Full charge (alkaline) is 1.5 volts.

What would the voltage be at "zero" charge? I calculate 1.03 volts.

From 1.5 v to 1.3 v the batteries lost 57% of their charge.
Is this a correct way to think about this? Just curious.

I did notice that when I put fully charged rechargeable batteries in the remote (1.45v), the TV reported only 80% charge.

A new AA usually measures 1.6

Any device I have if the batteries are 1.25 or so they are considered dead and the device won't work. Sometimes I can get 1.2 or so from a few LED flashlights but will be really dim and considered dead.

its a remote and means nothing, dont overthink it.

 

[the skipper]

While not necessarily the subject being discussed, I'd like to interject that those coppertop wonders have leaked in virtually evert remote that is rarely used. Make of this what you will.

 

[Blue Shadow]

1.0something is a AAbattery that isn't going to do much, even use in a remote won't fire the LED enough for action, based on some measurements I've made.

 

[beat_truck]

While not necessarily the subject being discussed, I'd like to interject that those coppertop wonders have leaked in virtually evert remote that is rarely used. Make of this what you will.

On the Antique Radio Forum, Duracells are widely known to be leak-o-matic garbage. They have even posted pictures of Duracell 9v batteries that are leaking in the packages while in the store for sale. I've had them leak too, and won't buy them or have them in the house.

For most things like remotes, clocks, radios, etc. I use cheapo Rayovacs or Sunbeams from Big Lots or The Dollar Store. For high drain devices like my digital camera where the cheap batteries don't work well or at all, I use Energizer Extremes (or whatever their better batteries are). I haven't had a problem with any of them leaking.

 

[BillyTheKid]

My dad was a TV repair man back in the day. He taught me that batteries had to be tested under a load...He used a flashlight bulb and a piece of wire. I still use the same method, it tells me all i need to know.

 

[sanford12]

I'm using Panasonic Eneloop NiHM AA's in the TV remote no problem. Use them in the radios for the RC trucks and in LED flashlights.

 

[Hajidub]

My dad was a TV repair man back in the day. He taught me that batteries had to be tested under a load...He used a flashlight bulb and a piece of wire. I still use the same method, it tells me all i need to know.

You think he can help me fix my wrecked Camaro?