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- Xref: sparky misc.consumers:21822 misc.consumers.house:16583 misc.kids:32166
- Newsgroups: misc.consumers,misc.consumers.house,misc.kids
- Path: sparky!uunet!s5!joec
- From: joec@fid.morgan.com (Joe Collins)
- Subject: Rechargable Batteries
- Message-ID: <1993Jan11.205609.7424@fid.morgan.com>
- Organization: None
- References: <1993Jan4.150614.6635@kodak.kodak.com>
- Distribution: na
- Date: Mon, 11 Jan 1993 20:56:09 GMT
- Lines: 71
-
- In article <1993Jan4.150614.6635@kodak.kodak.com> marulli@kodak.kodak.com (Dave x71244/RDCS/2-205-KO) writes:
- >I am looking for a 'cheap' source for NiCad batteries. Does anyone know
- >of perhaps a mail order place or a chain store that has them cheaper than
- >Radio Shack. ($9.75/9V, $5.75/2 pack of D-cells, etc)
- RS has them on sale periodically....In addition their blue/white D-cells
- are rumored to be a C-cell in a bigger wrapper.
-
- >With all the kid's toys, I was as given a battery charger for Christmas. Now
- >I'm looking at a second mortgage in order to stock up on all the batteries
- >I will need, especially if I want spares!
- >
- >Also, does anyone have hints about uses of NiCads? For example, one toy
- >will not run on known good rechargables. The truck won't even start. Radio
- >Shack tells me that it's because the NiCads are .25V lower than standard
- >batteries and the truck must need the full voltage (4x1.5V) I have a problem
- >with this because the truck simply slows down with weak standard batteries
- >but still starts up. In addition, my Mom's point and shoot 35MM camera has
- >a 'No NiCad' symbol in the battery compartment. Could there be a connection?
-
- Due to the cemistry involved, Ni-cads cells put out 1.2Volt instead of 1.5 in
- the standard cells. Anything that uses multiple cells (i.e. a battery) may have
- a problem:
- 6 standards @ 1.5 volts each is 9 volts (6x1.5)
- 6 Nicads @ 1.2 volts each is 7.2 volts (6x1.2)
- Thats why nicads are not always appropiate.
-
- NOTE: a cell denotes a single chemical unit while a battery denotes a
- collection of cells to make higher voltages. For example, a 9 volt
- battery is collect of individual cells wired in series.
-
- I have been using Nicads for years (and am using them right now in my walkman).
- They do work well under the right circumstances. I first became aware of them
- when I received a radio scanner as a present. The alkalines lasted one week.
- I then bought rechargeables and they lasted 9 months (recharging as needed).
- The economics became instantly obvious.
-
- To keep them longer, only charge them when you are ready to use them and
- adhere to the cell charge times, i.e. don't undercharge or overcharge
- them. Charged cells/batteries lose 1-2%/day of their charge when idle, i.e.
- on the shelf.
-
- After I use a ni-cad cell and it appears dead, I deep-discharge it further by
- connecting the cell to a light rated for 1.5 volts until the light goes out.
- I leave it connected for a few hours more after the light goes out.
- This allows the nicad to be fully discharged before recharging it. This
- should make for a longer lasting cell.
-
- Whats not good is to recharge it before its discharged. Nicads are said
- to 'remember' this and thus the NEXT time, it will run down sooner.
- Thats why I deep-discharge them before recharging them.
-
- Car batteries are a different chemistry altogether and they should be
- left charged when not in use (by design). Certain video batteries may use
- the same chemistry. Read the instructions of any device that uses rechargeable
- batteries to determine what type of battery it is - The hint is the info
- on recharging.
-
- Rechargeables will eventually wear out as do most items in life - its called
- the 2nd law of Thermodynamics (i.e. entropy). Sorry about that....
-
- >
- >What about mixing NiCads and standard? Rumor has it that I will weaken
- >both types of batteries very rapidly. True?
- I wouldn't....
-
- >Anything anyone knows would be a help. Thanks!
-
- Hope that helps.....
-
-
-
-