Does this battery have protection circuit to limit overcharge and overdischarge" A: The answer is yes, these are protected cells. I received and tested the batteries. Writing on the label says the IC for protection against short circuit, overcharge, and discharge protection has a life of about 10 years. Does this battery have protection circuit to limit overcharge and overdischarge" A: The answer is yes, these are protected cells. I received and tested the batteries. Writing on the... » Read More Does this battery have protection circuit to limit overcharge and overdischarge" A: The answer is yes, these are protected cells. I received and tested the batteries. Writing on the label says the IC for protection against short circuit, overcharge, and discharge protection has a life of about 10 years. « Show Less
858895
Stop encouraging idiots. Throw this question in the trash These batteries cost app $ 2.00 each including shipping. That makes them disposable. Anyone who does know how to charge and use Li-on batteries should leave them alone and stick to AA alkaline batteries
858896
There doesn't appear to be any protection built into these batteries. I took a voltage measurement while I had these sitting out of circuit and they had just over 4 volts several days after I gave them a little time in the charger.
1638105
I believe the charging circuit monitors the voltage and as the voltage reaches the maximum for that type battery the charging stops. The lights turn from red (Charging) to green when fully charged. It is recommended to take the batteries out once charged and use them. If its not a device I have to have I just take the dead batteries out and charge them and put them back in. They charge quite rapidly. If the battery is bad it won't charge them. I love it, especially the dual usb chargers on the front. I can quick charge my phone with the 2 amp or leave it on all night with the 1 amp. Per your question no, I don't believe it will overcharge a battery. I believe the charging circuit monitors the voltage and as the voltage reaches the maximum for that type battery the charging stops. The lights turn from red (Charging) to green when fully charged. It is recommended to take the batteries out once charged and use them. If its not a device I have to have I just take the dead batteries out and charge them and put them back in. They charge quite rapidly. If the battery is bad it won't charge them. I love it, especially the dual usb chargers on the front. I can quick charge my phone with the 2 amp or leave it on all night with the 1 amp. Per... » Read More I believe the charging circuit monitors the voltage and as the voltage reaches the maximum for that type battery the charging stops. The lights turn from red (Charging) to green when fully charged. It is recommended to take the batteries out once charged and use them. If its not a device I have to have I just take the dead batteries out and charge them and put them back in. They charge quite rapidly. If the battery is bad it won't charge them. I love it, especially the dual usb chargers on the front. I can quick charge my phone with the 2 amp or leave it on all night with the 1 amp. Per your question no, I don't believe it will overcharge a battery. « Show Less
905741
Generally if the seller doesn't claim that it is "protected", you can be quite sure it is NOT. To protect, they have to add a protector disk, typically at the bottom of the battery; and connect the + & - terminals to the protection circuit. As such the battery will cost more than the same battery without protection. So check the title & description, you should be able to decide if it is protected or not.
1515703
18650 Batteries come in two versions, one "unprotected" and the other "protected". The "protected" batteries are just a tiny bit longer than the other. That might make the difference for you.
222902
Hi! I just read the little manual that came with the charger. It says the charger has Individual Maximum Timer Control for overcharge protection. By the way, I love this charger and think it works very well. Hope that helps! :)
786935
Hi there is a switch inside the battery compartment, if that switch is set to the Nicad position and you put rechargeable cells in the unit they will be recharged with a quite sophisticated charger that does not overcharge or damage the battery.Hans. J Weedon.
412396
When the battery is charging the internal voltage increases. When that voltage reaches a certain preset point, the controller is supposed to shut off charging current. It seems to work that way to prevent overcharging. As far as discharge, there is supposed to be a diode in the circuit that prevents current from leaving the battery but allows current to enter the battery for charging.
1981314
I was unsure of buying this battery I saw some of the review on it and I said why not try and I have not had any problems with it. there is a six cell and a 9 cell I got the 9 cell battery. I hope this answer your question.
1949368
I haven't had Wasabi's long enough to know about them in particular... Just generically, a decent lithium cell should be good for a few hundred cycles or 3-4 years... generally lasting longer if stored about 50% charged and at cool (40-70F) temperatures. Storing them completely discharged (or allowing them to completely self-discharge) isn't a good idea. These things are somewhat unpredictable -- ask Boeing -- but most of us hope to get a few years out of them...
943268
No, you can not over charge the battery. It does not have a charge controller but it has a voltage regulator that prevents overcharging (additionally, it keeps power from the alternator from reaching the panel). I have had mine plugged in for 7 months straight and can even drive with it connected with no problems.
1756713
You cannot overcharge the battery so don't worry about it. Also no harm done if you undercharge. I have had mine for years, and to be honest do not charge it regularly, and have not had any problems. These are really just guidelines.
683411
I am not sure that anyone could truly answer that question. It all depends on the battery. I think it might last about a hour on a full charged battery. I don't think there is any overheat problems. You can always buy extra batteries and simply plug one in after the other has gone out.
782229
Michael, because these are Nickel Cadmium (Ni-Cd), they have a memory. In other words they remember how low their charge gets, before they are recharged, Charging them too soon, will prevent you from getting all the battery has to offer. Try to charge them when they get very low. That way you'll get the longest life from them. Keep in mind that the hotter the batteries get, the more internal damage occurs. Try not to let them get too hot. Their life cycle will be shortened. Use them, charge them, and then use them again is probably the best bet, unless you have some sophisticated temperature, current and an adjustable charger at hand. Norm Michael, because these are Nickel Cadmium (Ni-Cd), they have a memory. In other words they remember how low their charge gets, before they are recharged, Charging them too soon, will prevent you from getting all the battery has to offer. Try to charge them when they get very low. That way you'll get the longest life from them. Keep in mind that the hotter the batteries get, the more internal damage occurs. Try not to let them get too hot. Their life cycle will be shortened. Use them, charge them, and then use them again is probably the best bet, unless you have some sophisticated... » Read More Michael, because these are Nickel Cadmium (Ni-Cd), they have a memory. In other words they remember how low their charge gets, before they are recharged, Charging them too soon, will prevent you from getting all the battery has to offer. Try to charge them when they get very low. That way you'll get the longest life from them. Keep in mind that the hotter the batteries get, the more internal damage occurs. Try not to let them get too hot. Their life cycle will be shortened. Use them, charge them, and then use them again is probably the best bet, unless you have some sophisticated temperature, current and an adjustable charger at hand. Norm « Show Less
2025934
No, you will not ruin the battery by a DOD (depth of discharge) below 50% the first time, or every time for that matter. You WILL reduce the lifespan by repeatedly taking it below 50% but in essence, the deep cycle battery is made for repeated discharge cycles followed by charging either by way of solar panels or AC battery charger. Batteries will last longer if you can manage to limit the DOD to a range between 70%-80%, for example, at 50% DOD you may get 450 charging cycles before the battery is dead but at 80% DOD you may get as many as 1,200 charging cycles. So while the greater depth of discharge is within the capability of the deep cycle battery, it does have a negative effect on lifespan. What can really damage the battery in very short order is slow recharging or leaving the battery depleted for long periods after the 50% DOD. Also leaving or allowing the batteries to operate at higher temperatures than 80 degrees takes its toll, so quickly recharging the battery will have mitigating qualities which will help to preserve the integrity of the battery. Overcharging and undercharging can result in the battery shedding active material or the sulfation of the battery so in addition to quickly recharging the battery after a deep discharge, you need to protect the battery from overcharging. This can be done with a charge controller if you are using solar power to recharge the battery or in the event of AC recharging, typically battery chargers have systems in place to prevent overcharging built into the charging device. So, I hope I have answered your question adequately as I have much experience with deep cycle batteries because I use them in my stand alone solar power station and have burned out several batteries due to my ignorance and clumsiness. Deep cycle batteries are tougher than the typical automotive battery with thicker lead plates and I think a little more tolerance to overworking than a much lighter duty auto battery. P. Minns Solar Tech DIY, Inc
1044418
I am not sure about overvoltage protection, but I have had this product for quite some time now and hasn't caused a fire yet. Hope that helps.
159113
My battery still works the same as new. Lithium Ion batteries like to be stored with at least 3/4 charge and normally have very long life. Avoiding deep discharge should also prolong life. There are several good battery encyclopedias on the web that will tell you all about lithium ion batteries.
151317
The instructions say "You cannot overcharge this unit using the AC charging method." However, elsewhere in the manual it says "overcharging will reduce battery life." But if you charge it DC you should not exceed 6 hours of charging time.