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- Newsgroups: sci.electronics
- Path: sparky!uunet!nwnexus!beauty!josh
- From: josh@Happy-Man.com (Joshua_Putnam)
- Subject: Re: Battery Gell cell or Lead acid?
- Message-ID: <1993Jan6.192544.198@Happy-Man.com>
- Reply-To: Joshua_Putnam@happy-man.com
- Organization: Happy Man Corp., Vashon Island, WA 98070-7399
- References: <1993Jan5.145618.8600@oclc.org>
- Date: Wed, 6 Jan 1993 19:25:44 GMT
- Lines: 32
-
- In <1993Jan5.145618.8600@oclc.org> fhn@oclc.org (James Feehan) writes:
-
- >I am in the process of making a rechargeable bicycle light and wanted to know
- >which type of battery would be better Gell Cell or a Lead Acid. What are the
- >pros and cons of each? I have heard that it's not a good idea to fully
- >discharge a Lead Acid is this true? Also how would the cold effect each of
- >these types of batteries?
-
- A gel cell is really a lead-acid gel cell -- the difference is
- whether the battery acid can spill all over your hands when you
- tip over the battery :-0
-
- The battery will last longest if kept fully charged, but not
- overcharged. Deep discharge will damage batteries not designed
- for it.
-
- Cold reduces the speed of chemical reactions in the battery, so
- you should de-rate its capacity & maximum current in the cold.
- This isn't a big problem in most bicycle applications. My
- headlight battery is in a neoprene-insulated nylon bag, and the
- battery stays above ambient temperature from the heat generated
- during charge/discharge. It works fine in the mid-teens, but I
- haven't tried riding with it in weather colder than that.
-
- There are numerous articles discussing homebrew bikelights in the
- rec.bicycles.* archives, including a discussion of batteries, I
- believe.
- --
- Joshua_Putnam@happy-man.com Happy Man Corp. 206/463-9399 x102
- 4410 SW Pt. Robinson Rd., Vashon Island, WA 98070-7399 fax x108
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