Battery Quality Problem? "Bang"! Look Who Blew Up!

The advantage of standards is that they have many advantages. The same applies to the battery world. Well, I came across a new kind of battery (at least new to me). I call it a Russian doll.

Brokensphere works

Like the Russian Doll above, this kind of battery is composed of smaller battery cells. The 12V "23a" (also known as A23, mn21, mn23...) battery here consists of eight lr932 button batteries. They are used for remote control and security system sensors. These applications require small product size and high voltage, such as the wireless door sensor of my alarm system.

Having said so much, what's the problem?

The thing is, I ordered 20 batteries. After receiving the batteries, I found that about half of them were broken!

Under 1K Ω load, the voltage of the bad battery is close to 0 (e.g. 1mV) to very weak (e.g. 11.5V). However, what I want to say is that through measurement, I found that all the battery units in the two broken batteries were good.

Ha! The crux of the problem may be poor contact.

I'm not surprised at all. Why? Because I took apart the two bad batteries with the power of my fingers without the help of any tools. Haven't manufacturers thought about how to keep these batteries in good contact, especially with the passage of time and changes in environmental conditions? I can't figure it out.

Moreover, this kind of battery is still manufactured by big manufacturers such as Eveready (now called energizer?), Duracell and Toshiba. They will not tolerate 50% inefficiency. Better production processes - clean battery cell contacts and higher stacking pressure (of course, meet the requirements) - are bound to produce reliable products. Maybe they welded the battery cells together.

I was so curious that I ordered these famous brand batteries and the batteries of three other Far East manufacturers.

Here are some of my findings.

Bang!

You will ask, what is battery firecrackers?

As soon as I received these good batteries, I immediately replaced the first batch of terrible batteries that had been installed. Some of these batteries were broken. It is particularly difficult to remove one of the batteries. I think it's a little inflated! When I pried it out, there was no warning, "bang" sound, and one of the battery units exploded like a small firecracker. Then more battery cells fell out. The remaining batteries are now lying in a metal box waiting to be handled, and away from any inflammables! No, I think they might burn, it's really

By the way, the battery cells of the first group of batteries are marked with lr930, and all such battery cells I can find are marked with lr932. In this way, lr930 does not seem to exist. Such a situation can not help but people do not think much.

Fix it?

Can these defective batteries be repaired? Maybe. I have a battery here. When there is a load, the voltage is 1mV. If you apply a little pressure with the probe, the voltage will rise to 20mV. The no-load reading rises from 4V to 8V. I want to know what to do

Well, after applying a little pressure on the edge of the packaging paper with a vise, the load reading becomes 20 30mV and the no-load reading is 11V. From the measurement results, the situation has improved, but it is still a bad battery, which is far from being repaired.

Disassemble all battery samples. No welding.

Pay attention to the Toshiba battery unit. The bottom one has expanded and looks like it's going to explode. I guess it was damaged when prying off the battery shell (the packaging leather of all other batteries is stronger than the first batch).

Nevertheless, the most interesting thing is that the corrugated spring rings of the three famous brand batteries are also stacked with the battery units. ah There is no problem with its design. In fact, pkcell also has a spring, but there are some failures. Who knows

Here are the comments of EDN American readers who read this article.

@Amclaussen is a trick used by Chinese people... I saw that the first battery was renamed "alkaine" instead of "alkaline". I remember in the 1970s, our downtown was full of cassette tapes called "Soni", which imitated Sony and was absolutely rubbish! Their packaging is almost the same as that of real Sony products, except that they are a little faded, and they are welded by ultrasonic. Real Sony cassette tapes are connected by screws (which is easy to repair). At that time, the Chinese just copied cheap goods. Up to now, they can copy almost anything, including the expensive "Hitachi" large electrolytic capacitor, which uses a similar but non-existent serial number. Even the expensive power transistor in the TO-3 iron cap can be imitated. The TO-3 iron cap is at least true, but the semiconductor chip inside is replaced by a much smaller imitated transistor. The measurement results should be passable, but it can only withstand about one-third of the rated current and explode into a cloud of smoke!

@Nigel doesn't know if the battery cells in these batteries are the same. Interestingly, if the battery units are the same, it can be attributed to the poor packaging.

@Michael Dunn all battery cells have different marks.

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