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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!cs.utexas.edu!gateway
- From: tquinn@heartland.bradley.edu (Terry Quinn)
- Newsgroups: rec.video
- Subject: Re: NiCd Batteries, Part 3/3
- Date: 28 Dec 1992 17:33:34 -0600
- Organization: CS Dept, University of Texas at Austin
- Lines: 37
- Sender: daemon@cs.utexas.edu
- Message-ID: <9212282333.AA27960@heartland.bradley.edu_>
- Reply-To: tquinn@heartland.bradley.edu
- NNTP-Posting-Host: cs.utexas.edu
-
-
-
- > > NICAD CELL CHARACTERISTICS
- > > by
- > > W6WTU
- >
- > Here's what I do: When the batteries in a device are low, I remove
- > them and put them into a discharger I built. This discharger is simply
- > a light bulb in series with a battery holder that holds 1 battery. I
- > discharge the batteries individually and then put them into the
- > charger. Is this good or bad? I've toyed with adding a diode to
- > the circuit so that the batteries only discharge to .7 volts instead
- > of to 0 volts.
-
- I've done this also, and at the suggestion of Mike Brown, directed
- the current against 3 diodes in series. This keeps the battery
- pack from dropping below 2 volts.
-
- However, after reading some of this thread, I am wondering if even
- that is safe. The above article indicates that if you take an
- individual cell below 1.1 volts, and it is a multi-cell pack,
- there is a chance of reverse charging the weakest cell. If I
- interpret that correctly, a 5 cell battery such as a typical
- camcorder 6v nominal pack should not be discharged below 5.5
- volts, and you run the risk of damaging it if you were to take it
- down to 2 volts.
-
- Does anyone have some thoughts on this? Even my camera manual
- says that it is good to discharge the battery fully by running it
- until the battery indicator comes on, but 5.5 volts doesn't seem
- very low.
-
- --
- Terry Quinn
- Germantown Hills, IL
- tquinn@heartland.bradley.edu
- from Compuserve . . . >INTERNET: tquinn@heartland.bradley.edu
-