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cluros(at)gmail.com
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 Posted: Wed Nov 04, 2020 8:16 am Post subject: Ni-Cd Battery Safety Information Bulletin |
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Interesting, I have never heard of this.
Aircraft Maintenance Manual Aircraft Parking Procedures usually require the physical disconnection of the aircraft batteries, and the periodic reconnection to carry out the parking or storage checks. A Type Certificate (TC) holder in conjunction with a battery manufacturer has identified that when a Nickel-Cadmium (Ni-Cd) battery is disconnected from the aircraft loads, it self-discharges due to an electrochemical phenomenon, thus inducing a reduction of battery capacity. When the battery is charged again from the aircraft, the battery does not recover 100% of its initial capacity. Therefore, after each cycle of battery self-discharge, the available battery capacity will decrease progressively.
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Ceengland
Joined: 11 Oct 2020
Posts: 379
Location: MS
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| Posted: Wed Nov 04, 2020 8:43 am Post subject: Ni-Cd Battery Safety Information Bulletin |
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On 11/4/2020 10:11 AM, Sebastien wrote:
| Quote: | Interesting, I have never heard of this.
Aircraft Maintenance Manual Aircraft Parking Procedures usually require the physical disconnection of the aircraft batteries, and the periodic reconnection to carry out the parking or storage checks. A Type Certificate (TC) holder in conjunction with a battery manufacturer has identified that when a Nickel-Cadmium (Ni-Cd) battery is disconnected from the aircraft loads, it self-discharges due to an electrochemical phenomenon, thus inducing a reduction of battery capacity. When the battery is charged again from the aircraft, the battery does not recover 100% of its initial capacity. Therefore, after each cycle of battery self-discharge, the available battery capacity will decrease progressively.
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Interesting, but isn't it more of academic than practical interest, for most of us? I doubt that you could find a NiCd starting battery in a homebuilt these days.
Charlie
 Virus-free. www.avast.com [url=#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2] [/url]
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stuart(at)stuarthutchison
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| Posted: Wed Nov 04, 2020 3:49 pm Post subject: Ni-Cd Battery Safety Information Bulletin |
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Yes, few if any NiCd left in GA. This is the ‘memory effect’ of NiCd, which grows larger crystals in the electrolyte over time. These have a smaller interstitial surface area, therefore less chemical reaction can take place, so degraded capacity unless properly ‘deep-cycled’. | Quote: | On 5 Nov 2020, at 3:38 am, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
On 11/4/2020 10:11 AM, Sebastien wrote:
| Quote: | Interesting, I have never heard of this.
Aircraft Maintenance Manual Aircraft Parking Procedures usually require the physical disconnection of the aircraft batteries, and the periodic reconnection to carry out the parking or storage checks. A Type Certificate (TC) holder in conjunction with a battery manufacturer has identified that when a Nickel-Cadmium (Ni-Cd) battery is disconnected from the aircraft loads, it self-discharges due to an electrochemical phenomenon, thus inducing a reduction of battery capacity. When the battery is charged again from the aircraft, the battery does not recover 100% of its initial capacity. Therefore, after each cycle of battery self-discharge, the available battery capacity will decrease progressively.
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Interesting, but isn't it more of academic than practical interest, for most of us? I doubt that you could find a NiCd starting battery in a homebuilt these days. Charlie Virus-free. www.avast.com [url=x-msg://1/#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2][/url]
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