Sealed Batteries vs. Unsealed Batteries

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In summary, sealed lead storage batteries have not been used in the past due to the hazardous nature of hydrogen gas produced during discharge and the lack of technology to safely contain it. However, modern sealed batteries have a safety vent to release excess gas and prevent pressure build-up. The pressure does increase during discharge, but it is not cumulative over the life of the battery as the hydrogen gas is reabsorbed during charging.
  • #1
apchemstudent
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Newly devised automobile batteries are sealed. When lead storage batteries discharge, they produce hydrogen. Do you know why sealed lead storage batteries have not been used in the past?

Is it because the hydrogen gas is hazardous under such high pressure and back then, they couldn't sustain a safe temperature for the batteries since no such technology was available yet or well-equipped for that job?

I had to estimate the increase in pressure if 0.05 grams of hydrogen gas was produced and it was around 6 atm.

Please reply. If you don't agree, please explain your answer as well, thanks in advance.
 
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  • #2
Sealed batteries have a safety vent to allow gas to escape if pressure gets too high. So the answer is, that the pressure does increase to whatever value the safety vent is set for.

But when charge is complete, pressurized hydrogen is reabsorbed, so the gas pressure is not cumulative over the life of the battery.
 

1. What is the difference between sealed and unsealed batteries?

Sealed batteries are completely enclosed and do not allow for any maintenance or addition of electrolyte. Unsealed batteries have a removable cap or cover that allows for maintenance and addition of electrolyte.

2. Which type of battery is better for long-term use?

Sealed batteries are typically better for long-term use because they have a longer lifespan and require less maintenance. Unsealed batteries may require more frequent maintenance and replacement of electrolyte, which can be costly and time-consuming.

3. Can sealed batteries be recharged?

Yes, sealed batteries can be recharged just like unsealed batteries. However, some sealed batteries may require specialized chargers or charging methods. It is important to follow the manufacturer's instructions for recharging sealed batteries.

4. Are unsealed batteries more prone to leaks?

Unsealed batteries are more prone to leaks because they have a removable cap or cover that can be easily damaged or loosened. This can cause electrolyte to leak out, which can be hazardous and also lead to a shorter lifespan for the battery.

5. Which type of battery is more environmentally friendly?

Sealed batteries are generally considered more environmentally friendly because they do not require regular maintenance and replacement of electrolyte, which can be harmful to the environment if not disposed of properly. However, both sealed and unsealed batteries should be recycled to prevent any negative impact on the environment.

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