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Gel batteries (#GEL) are a type of sealed lead-acid battery in which the electrolyte is thickened into a gel by adding silica. They belong to the #VRLA (Valve Regulated Lead Acid) family — maintenance-free, sealed batteries with pressure-relief valves.
Advantages of Gel #Batteries
• Sealed and maintenance-free — no water topping-up, minimal gas emission.
• Long service life — typically 6–12 years in standby applications.
• Deep-cycle capable — handle deep discharges better than AGM batteries.
• Vibration resistant — suitable for marine environments.
• Safe — very low risk of acid leakage.
• Wide operating temperature range — around −20 to +50 °C (model-dependent).
Disadvantages
• More expensive than AGM or flooded lead-acid batteries.
• Lower charge current tolerance — require precise charge control.
• Sensitive to overcharging, especially at high temperatures.
Typical Applications
• Marine systems (emergency power, communication systems).
• #UPS (Uninterruptible Power Supplies).
• Solar and off-grid power systems.
• Electric vehicles and medical equipment.
Charging Parameters
Proper charging is critical for long battery life:
• Bulk/Absorption voltage: 14.0–14.4 V (for a 12 V battery).
• Float #voltage: 13.5–13.8 V.
• Charge current: typically 0.1C (10% of capacity).
• Temperature compensation: about −3 mV/°C per cell.
How to Identify a Faulty Gel Battery
• Significant capacity loss (over 30% drop).
• Strong voltage drop under load.
• #Battery gets unusually warm while charging.
• Swelling of the case (critical sign).
• High internal #resistance during testing.
Advantages of Gel #Batteries
• Sealed and maintenance-free — no water topping-up, minimal gas emission.
• Long service life — typically 6–12 years in standby applications.
• Deep-cycle capable — handle deep discharges better than AGM batteries.
• Vibration resistant — suitable for marine environments.
• Safe — very low risk of acid leakage.
• Wide operating temperature range — around −20 to +50 °C (model-dependent).
Disadvantages
• More expensive than AGM or flooded lead-acid batteries.
• Lower charge current tolerance — require precise charge control.
• Sensitive to overcharging, especially at high temperatures.
Typical Applications
• Marine systems (emergency power, communication systems).
• #UPS (Uninterruptible Power Supplies).
• Solar and off-grid power systems.
• Electric vehicles and medical equipment.
Charging Parameters
Proper charging is critical for long battery life:
• Bulk/Absorption voltage: 14.0–14.4 V (for a 12 V battery).
• Float #voltage: 13.5–13.8 V.
• Charge current: typically 0.1C (10% of capacity).
• Temperature compensation: about −3 mV/°C per cell.
How to Identify a Faulty Gel Battery
• Significant capacity loss (over 30% drop).
• Strong voltage drop under load.
• #Battery gets unusually warm while charging.
• Swelling of the case (critical sign).
• High internal #resistance during testing.
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Loose Wire on Containership Dali Leads to Blackouts and Contact with Baltimore’s Francis Scott Key Bridge
Date: November 18, 2025
Key Points:
• A single loose #wire in the electrical system of the 984-foot long #containership Dali caused an electrical blackout.
• The #blackout led to the vessel losing both propulsion and steering while passing near the Francis Scott Key Bridge (Key Bridge) in Baltimore, and the ship contacted the bridge structure.
• The incident occurred on March 26, 2024; the bridge collapse followed, resulting in the deaths of six highway workers.
• The investigation revealed that the wire-label banding prevented the wire from being fully inserted into a terminal-block spring-clamp, causing an inadequate connection which triggered a #breaker to trip.
• During the series of events: after the first blackout the ship’s heading swung toward Pier 17 of the Key Bridge; despite efforts by pilots and shoreside dispatchers, the loss of #propulsion close to the bridge made avoiding the collision impossible.
• The size of the #ship and the lack of bridge design counter-measures for large ocean-going vessels contributed to the severity of the event. For example, an earlier collision by the ship Blue Nagoya in 1980 (390 ft long) caused only minor damage; the Dali was about ten times the size.
• As a result of the investigation, NTSB issued a series of safety recommendations to multiple parties including the United States Coast Guard, the Federal Highway Administration, bridge-owners nationwide, and electrical-component manufacturers.
• #NTSB emphasised that this incident was preventable, and that implementation of the recommendations is essential to avoid similar tragedies in the future.
🔗 Link to the news ➡️ https://www.ntsb.gov/news/press-releases/Pages/NR20251118.aspx
#news
Date: November 18, 2025
Key Points:
• A single loose #wire in the electrical system of the 984-foot long #containership Dali caused an electrical blackout.
• The #blackout led to the vessel losing both propulsion and steering while passing near the Francis Scott Key Bridge (Key Bridge) in Baltimore, and the ship contacted the bridge structure.
• The incident occurred on March 26, 2024; the bridge collapse followed, resulting in the deaths of six highway workers.
• The investigation revealed that the wire-label banding prevented the wire from being fully inserted into a terminal-block spring-clamp, causing an inadequate connection which triggered a #breaker to trip.
• During the series of events: after the first blackout the ship’s heading swung toward Pier 17 of the Key Bridge; despite efforts by pilots and shoreside dispatchers, the loss of #propulsion close to the bridge made avoiding the collision impossible.
• The size of the #ship and the lack of bridge design counter-measures for large ocean-going vessels contributed to the severity of the event. For example, an earlier collision by the ship Blue Nagoya in 1980 (390 ft long) caused only minor damage; the Dali was about ten times the size.
• As a result of the investigation, NTSB issued a series of safety recommendations to multiple parties including the United States Coast Guard, the Federal Highway Administration, bridge-owners nationwide, and electrical-component manufacturers.
• #NTSB emphasised that this incident was preventable, and that implementation of the recommendations is essential to avoid similar tragedies in the future.
#news
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