Yes, these batteries need a protection circuit. I bought some and took them apart. If they get drained to much there is a chance they might catch fire. The protection circuit stops power coming from the batteries if the voltage gets too low. So, if you don't wanna burn get a protection circuit.bgnome wrote:please correct me if i am wrong, but i do not think you need to buy a separate protection circuit. the charger itself has the protection circuit built in to it. you are supposed to hook up the balancing connector to it and it is supposed to take care of maintaining each cell and bringing them up to the correct voltage.hailrazer wrote:Yes guys they will work. You just need the charging circuit linked to on page 1 of this thread and then a charger also linked on the first page.
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- cowsgoquack101
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the charger will only keep it from overcharging, but the safety PCB will keep it from overcharging, being drained too far (will cut off power once it gets to a certain voltage), and some will keep each cell balanced and equally charged.cowsgoquack101 wrote:Wait, just a question since I know little to nothing about batteries, is that charger linked on one of the pages (1st or 2nd) able to charge them without a protection circuit or will that still be necessary? Because the charger has the same connector for the batteries.
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- jjhammerstein
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I think that the charger is made with the protection built in.
It HAS to be, otherwise they couldn't sell them together without a third piece.
It HAS to be, otherwise they couldn't sell them together without a third piece.
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so, when your batteries are not being charged what is protecting them? Just buy the protection circuit. If you are too poor to afford one then you should not be porablizing.jjhammerstein wrote:I think that the charger is made with the protection built in.
It HAS to be, otherwise they couldn't sell them together without a third piece.
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They sell them separate for a reason. They have different Current Limits, Overcharge Ratings, extra gauges and such.jjhammerstein wrote:I think that the charger is made with the protection built in.
It HAS to be, otherwise they couldn't sell them together without a third piece.
One protection circuit won't work for all Li-Poly batteries. You need the correct one for the batteries you have.
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i am with hammer on this one. like i have said, i have been doing quite a bit of research on this, and i think you might be confused as to the particular application these batteries are meant for. they are not being sold as single cells all willy-nilly-like, they are designed for RC application. NONE of the RC lipos come with an integrated protection circuit as they are designed for somewhat high discharge rates, which i would think would limit the amp output.hailrazer wrote:Dear Lord you guys are stubborn.
YOU HAVE TO HAVE THE PROTECTION CIRCUIT AND THE CHARGER !!!!!
End of discussion.
Here's a course paper by an electrical engineer that describes the options you have, (PCM integrated or not), and the advantages/disadvantages depending on the application. It is not a definitive source, but all I am saying is that no PCM is required if you use the correct type of charger. The overcharge protection and so on is built in to the charger, as described in the paper as one of the options, which is how they do it in the RC world.
If you use a balancing charger, you connect it to the balancing connection, which is wired to each individual cell. If you are not using a balancing charger, you will have to make sure that each cell is not overcharged, etc., which is where a PCM is important. Since the "smart charger" from allbattery is not meant to be a balancing charger, a PCM is required.
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The protection board is for charging.
If this charger is made specifically for these batteries, unmodified, then it is VERY HIGHLY likeley that the charger has SOME sort of technology to prevent catastrophic failure.
If this charger is made specifically for these batteries, unmodified, then it is VERY HIGHLY likeley that the charger has SOME sort of technology to prevent catastrophic failure.
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yes, the have a protection circuit IN them. not all chargers do, just these balancing ones.jjhammerstein wrote:The protection board is for charging.
If this charger is made specifically for these batteries, unmodified, then it is VERY HIGHLY likeley that the charger has SOME sort of technology to prevent catastrophic failure.
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I was just going to mention that. Regardless of whether the charger has a protection circuit, you'll need something in the portable to prevent discharging the batteries too much. Besides, a protection circuit costs like, what, $3.50? Please. Put one in.hailrazer wrote:The protection circuit is also so that you don't overdischarge the batteries.
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