Unprotected phone battery copies.

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You often find salvaged phone batteries in cheap imported products. It makes sense to reuse them in a less demanding application once their capacity has dropped a bit. Some of those products rely on the batteries internal protection circuit to prevent overcharging when simple USB or solar chargers are used.
I've used them in projects like this too, but I always double check that there's protection there and that it's working.
I do this by connecting the battery to my bench power supply and setting the voltage fro about 4.5V with a 500mA current limit. The voltage measured across the battery should gradually increase to between 4.2V and 4.5V whereupon the current will suddenly drop to zero as the cell protection kicks in. If the voltage keeps rising above 4.3V then there may not be a protection chip in use.
The battery I show in this video is the first of this type that I've tested that has not had a full protection PCB despite having the usual gold flashed PCB contacts.

Опубликовано:

9 дек 2018

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Комментарии : 295

@petersage5157 5 лет назад

I love that Clive tears down cheap consumer junk that the vast majority of us are likely to have. Helps us to know what traps to watch out for.

@martinclemesha4794 Год назад

Maybe 4 years ago, but I still enjoy this type of format Clive. Useful reminder, and gives an understanding of the basics. Good to know the charging characteristics for using a bench power supply for charging.

@johncrisman576 5 лет назад

I swear Clive was channeling Richard Attenborough during the commentary of this video. I love the voice, the temperament, and the tone of Clive's videos. But that is only partially why I listen. The education value is priceless. More please.

@NoviDooms

Thanks for the demo on how to remove the protection circuits on these types of batteries. Very useful to know! I collect old phones and I'm going to trying using the protection boards to bypass the battery requirement on some of them since finding replacement batteries is shady or just not an option.

@ilaril 5 лет назад

Every single official Nokia-branded battery has the protection circuit. We were quite proud of the fact.

@aserta 5 лет назад

No Nokia battery ever came without protection, even the 3310 ones had some form. As far as i'm concerned, the standard Nokia battery is the best one ever made. Long lasting, protected, and built like a

@Anvilshock 5 лет назад

Great. I JUST ordered an entire bag of used BL-5Cs for playing about with. Oh, am I looking forward to trying them in my projects now.

@ramast4881 5 лет назад

Thank you so much. I've always wanted to understand how does this protection circuit work and haven't figured it out until now.

@featheredskeptic1301 5 лет назад

I've came across something like this several years ago. It was a brand new cell that a friend of mine got for her phone. When attempting to recharge the phone the cell swelled up and was subsequently given to me for investigation. Upon revealing the "protection circuit" I came across a complete circuit board, designed to have the protection components soldered on it, that was instead empty with the exception of a 0 ohm link where the dual mosfet should be and a nameless smd transistor looking device in place of the dw01. It measured like a standard NPN transistor with the ohmmeter but I never bothered reverse engineering the thing. Not that there was much to reverse engineer anyway.

@Umski 5 лет назад

The middle (usually on 3 contact batteries) pin's resistance indicates the default battery capacity (and type) to the phone, crudely hardcoded - 68k indicating 650mAh. There were other versions with a fourth terminal that was the temperature monitor...

@rogerbeck3018 5 лет назад

be careful in this wide unscrupulous world. There are some people who do not care that your house burned down. They have your money.

@Psi105 5 лет назад

From what i can recall, the original Nokia BL batteries (back in the Nokia 31xx phone era) had no protection IC, just cell + / - and NTC pin.

@MrFmiller 5 лет назад

It's easy to tell if the knock off batteries have proper protection. All you need is a bunch of equipment, the knowledge and decades of experience to use it, and the patience and diligence to keep track of how they are charging. Otherwise you can spend the extra money. Thanks for the information Clive.

@visionofwellboyofficial 5 лет назад

Thank you for making this. Keep going Clive!

@matakaw4287 5 лет назад

The best videos on RU-vid. Keep them coming, Clive.

@90msg90 5 лет назад

Next in Big Clive's ebay purchase items list: 10 pcs Li-Ion protection 1S for $2.59.

@SuperFredAZ 5 лет назад

Each Mosfet has what is called a "body diode" which is a result of the manufacturing process. It is not a Schottky, this is useful for switching solenoids, relays etc. It is there and cannot be removed

@raymondmucklow3793 5 лет назад

Cheers to ya, another fine video, sir BigClive.

@teardowndan5364 5 лет назад

There are no actual diode across the FETs, those are only the "body diode" of the FETs - a parasitic diode that arises from how FETs are made from N-channel deposited on a P-doped substrate or vice-versa for P-channel, forming a PN (diode) junction. That's why you need a pair of back-to-back FETs to achieve complete bidirectional current shut-off.