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|    sci.electronics.basics    |    Elementary questions about electronics    |    72,318 messages    |
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|    Message 71,257 of 72,318    |
|    Phil Allison to default    |
|    Re: Charging NiMh batteries when not com    |
|    14 Jun 19 23:30:12    |
      From: pallison49@gmail.com              default wrote:       >              >       > Phil Allison wrote:       >       > >> >       > >> > The aaa alkaline batteries went out on my tv remote.       > >> >       > >> > I decided to use my NiMh UBL aaa batteries. 1100 mAh.       > >> >       > >> > They are currently showing 1.31 volts.       > >> >       > >> > And they work ok in the remote as is.       > >> >       > >> > My charger is the manual type.       > >> >       > >> > It charges that type at 150 mA.       > >> >       > >> > I want them fully charged since they are 1.2 volts versus 1.50 for the       alkaline.       > >> >       > >> > I would like to know how much longer to charge them.       > >> >       > >> >       > >> >       > >>       > >> ** The correct procedure is to discharge the cells fully and then apply a       full recharge cycle - 8 hours in your case.       > >>       > >> If you must recharge partly discharged cells, then it takes whatever time       needed until their temperate just starts to rise. Constant monitoring by you       is needed.       > >>       > >>       > >>       > >> ... Phil       > >       > >I have no way of monitoring temp.       > >       > >How do I fully discharge the cells manually?       > >       > >Andy       >       >       ..................................       >       >       > If they are unused, it is best to charge low self-discharge NiMH every       > nine to twelve months. Do NiMH batteries need to be completely       > discharged before charging? No, NiMH batteries do not have a memory.       > They can be charged without adverse effect at any point regardless of       > their state of charge.       >                     ** Fraid you did not read the question, the OP wanted to know HOW LONG to       charge his cells with his existing charger.              There is NO way to know that without first discharging them.              >       > Get a quality charger that monitors each battery under charge                     ** An expensive and unnecessary option.               IOW - a wank.                     >       > Monitoring temperature is over-kill IMO and not the best method. It       > is too dependent on ambient temperatures, air flow, etc..       >              ** Utter bullshit.              Long as one has fingers on the ends of one's hand, a user can easily monitor a       small temp rise that takes hours to happen.              Ambient and air flow have SFA to do with it.                     > Old Nickel Cadmium cells required discharging to get the full capacity       > out of them.                     ** A well worn myth that applies only to cells made in the 1960s.               Bet not too many of them are still working...                                   ... Phil              --- SoupGate-Win32 v1.05        * Origin: you cannot sedate... all the things you hate (1:229/2)    |
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