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- Path: sparky!uunet!portal!cup.portal.com!sbixby
- From: sbixby@cup.portal.com (Steven W Bixby)
- Newsgroups: rec.models.rc
- Subject: Re: Dead battery?
- Message-ID: <74333@cup.portal.com>
- Date: Mon, 25 Jan 93 10:40:58 PST
- Organization: The Portal System (TM)
- References: <wfMqE1_00iUxM5IW0x@andrew.cmu.edu>
- Lines: 34
-
- > My question: The battery was very low, and so I plugged the unit and
- >the transmitter battery pack into the factory supplied recharger
- >overnight. Ofter about 24 hours of recharging, the voltage on the
- >transmitter pack read at about 5.6 V, according to my Tower Hobbies
- >voltmeter (top of the "green" scale). However, the transmitter pack read
- >at only 9.5 V, which is rather low (the low end of the "green" scale).
- >Also, the voltmeter on the transmitter read only about 80%. When the
- >unit was new, the voltmeter read above 11 V, and the scale on the
- >transmitter read above 100%.
- > Is my batter dead? Can I fix it? Or should I just get a new battery.
- >Is this the expected life?(two years)?
-
- (Klaxons...!) WARNING - BATTERY UNSTABLE, DO NOT FLY. REPEAT... ....
-
- :)
-
- The battery may not be dead, but you might have to cycle it a few times
- to restore it's working order. Charge/discharge it 3-4 times, noting
- how long it takes to discharge each time. This is probably best done
- with a cycler for best results, especially since leaving the transmitter
- on for 2-3 hours at a time may heat up your RF deck more than you want.
-
- But anyway, if you can determine that the pack comes up to normal standards,
- then you should be safe to fly, but keep an eye on the pack over time,
- it may not be stable.
-
- Considering the price of another pack ($25?), you might be able to rescue
- your current one; but considering the price of a replacement plane (???)
- you might want to replace it.
-
- By the voltage numbers you stated, one cell is obviously not charging,
- and may not come around, but it's worth the effort of trying.
-
- -swb- (Steve Bixby, sbixby@cup.portal.com)
-