I have two unprotected 18650 batteries that I would like to use, but having read up on these (on CPF), I am a little worried that something drastic might possibly happen ... It seems that most of the problems occur when the batteries are in the charger, perhaps when the owner has left them alone (charging) too long ... Or in multiple cell devices where one cell has been more discharged than the others.
I only want to use these cells in a torch ... Not a super-power torch, only my Saik SA-8, my Solarforce L2i (lengthened), my Solarforce L2 (not yet received) or my recently ordered Romisen RC-U4 ... None of these torches is what I would call a super-power torch ... So, now I don't know what to do ... My charger is a Ultrafire WF-137 single cell charger.
Surely if the unprotected cells are as dangerous as people say (on CPF) then they should not be sold for using in torches ... I know that these cells are used in Laptop Computers and that there have been problems there, but that is in a system using multiple cells ... I have a friend with a laptop and it is continuously plugged into the mains when in use ... It is rarely (if ever) used on batteries alone, in fact I doubt whether it would work now on its batteries ... She doesn't use it often so it only gets used a couple of times a week for an hour or so each time ... It is now about nine years old and apparently still performs as she wants it to ... If this Laptop is using these problem cells then perhaps she has just been very lucky so far ... Sometimes though, she leaves the laptop on for a few days just to charge the batteries ... She is in her seventies and won't listen when I have told her to use it instead on battery only ... Perhaps I should tell her about these dangers ?
The two unprotected Ultrafire (blue) 18650s as yet uncharged by me, are both reading 3.69 volts according to my old Avo 8 ... My two Ultrafire (grey) which were charged yesterday are reading 3.7 volts ... I can't guarantee the absolute accuracy of the old analogue meter ... Since I have just received the blue (unprotected) ones, is it safe to fully charge them now ? ... When I use them in a torch, do I estimate when they should be recharged or do I have to bring the torches into my study regularly just to measure the voltage ? ... Do I wait till the LED torches containing the unprotected cells are starting to go dim before recharging ? ... At least with the protected ones there should be a point at which the LED goes out but still leaves the battery safe (I think).
Perhaps someone could point me to the best thread that covers these queries ... Maybe with reference voltages giving predicted remaining power in the cell ... There may be other relative newbies that are also a bit worried about the transition from old battery technology to these new (to us) cells.
I hope this thread makes some sense to the advanced torch user ... "We newbies got to start somewhere".