Are these high-drain batteries? And do the have an overcharge protection circuit?
888227
They do have protection circuit on them, maximum amps out I don't know, they run a Olight M20 on high for 5 hours plus.
358102
No, they do make a very good, high capacity low self discharge battery, but these are their high power batteries. The E series is their low discharge.
146067
Yes. While they seem to be somewhat tolerate to overcharging you can ruin them. I've left them for 12hr and had no problem. But when I forgot about one and left it for a day. It was ruined. It just wouldn't hold a long term charge anymore. I had used it quite a bit so it may it was just its time to die but all the others I've had have lasted a very long time.
1371681
Do not drain them. Charge overnight BEFORE you use them. I know in the past to drain then charge, but not with these.
1973041
The instructions are easy... Plug into wall or 12v (lighter) outlet. Batteries will only fit one way into the charger. light will indicate when charge is full. I have not had an issue with leaving them in too long. They will not "over-charge".
1071930
Do I need to fully discharge these batteries after they run low and then recharge them fully so that they won't loose there memory?
540667
No, there is over-charge protection built into the battery. With that being said, I still remove my batteries when I see the charge is complete. The 18 month warranty doesn't hurt either :-)
2111066
You will not overcharge if using the Digital charger supplied with the product, It automatically Stops charging. Also Ultrafire's 18650 batteries have built-in protection. They are quite good and hold up pretty well to abuse
1286583
Black & Decker says that these batteries can be left on their chargers indefinitely without overcharging. I don't know what would happen if you used a different charger.
247971
No, its a trickle charger and the current isn't enough to cause an overcharge. I have left it connected for long periods with out ill effect
2187594
Usually, over 80%， device has overcharge protection to protect battery. The overcharge protection is coming with device not charger I think. Hope this helps
1575380
They are not rechargeables. Not sure if they're used. I don't remember. It's been a while. I checked them on a battery tester and they have a full charge.
1939638
Not sure what you are asking but here goes .I use them on my job and need a back up battery. When they go dead they don't slow down slowly ,they just stop . I prefer to have a fully charged back up handy. These have proven to be excellent batteries . very good price also.
2240400
They're not necessary, no. The former is really recommended for any Lithium Ion battery for maximum battery lifespan, but it's not required and it won't hurt you to avoid it. Having read about this before, it appears that this is mostly for devices you aren't using constantly. Keeping a device at full charge for long periods is the real no-no. Short charges are bad for a battery, but we're talking roughly 5-10%. Discharging down to &gt;2% may not only not help, but in itself be bad for the battery (especially due to heat and the size of the battery). There has been talk about a memory effect, but only in the last eight months. Li Ion batteries have managed a 20 year history without significant noticeable effects of 'memory,' so take such arguments with a grain of salt.
2076645
First, what batteries came with the flashlight? Second, these batteries are rated at a max voltage of 4.2 VDCif you charged them with a charger with greater than 4.2 Volts, it with overpower the Diode and blow it.White diodes are voltage sensitive and anything in excess of 4.2 volts with blow them quick. Check the outputof your charger to ensure that its 4.2 VDC Max. Let me know thanks perry
1227311
I find they did and the batteries I had also exploded. I'm not sure if that is a cheap battery issue or a heat issue or that I left them with the switch on the ON position for 3+ months without using them.
1457569
No, by no means they are OEM batteries. They are cheap and have higher capacity, but they do not last long. Mine only lasted about 1.5 yrs, which was disappointing. But for the amount of money it is still fine.Update 150228: I might have found the reason for the short life. The STK charger overcharges just slightly to 8.5V, this is within the 50mV tolerance for 4.2V each cell (511A has two), but never the less this is not good for the battery longevity. I plan to use Cannon charger, which goes to 8.3V, and hope the best. Will update the result after 1.5 yrs (which is Aug 2016). Wish us luck! No, by no means they are OEM batteries. They are cheap and have higher capacity, but they do not last long. Mine only lasted about 1.5 yrs, which was disappointing. But for the amount of money it is still fine.Update 150228: I might have found the reason for the short life. The STK charger overcharges just slightly to 8.5V, this is within the 50mV tolerance for 4.2V each cell (511A has two), but never the less this is not good for the battery longevity. I plan to use Cannon charger, which goes to 8.3V, and hope the best. Will update the result after 1.5 yrs (which is Aug 2016).... » Read More No, by no means they are OEM batteries. They are cheap and have higher capacity, but they do not last long. Mine only lasted about 1.5 yrs, which was disappointing. But for the amount of money it is still fine.Update 150228: I might have found the reason for the short life. The STK charger overcharges just slightly to 8.5V, this is within the 50mV tolerance for 4.2V each cell (511A has two), but never the less this is not good for the battery longevity. I plan to use Cannon charger, which goes to 8.3V, and hope the best. Will update the result after 1.5 yrs (which is Aug 2016). Wish us luck! « Show Less