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Charging batteries for 8 hours

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Charging batteries for 8 hours

Post by chongwk on Sun Apr 04, 2010 4:03 pm

With the latest battery technologies. whenever I buy stuffs with batteries, the shopkeepers always tell me to "First time battery - charge it for 8 hours". However, when I open the book (camera battery in this case), it says full charge take 3 hours and should not let the battery too long on the charger as it will deteriorate the battery life.

Even AA rechargeable battery with fast chargers (for flash), shopkeepers always recommend first time charge make it 8 hours - even though it takes 1 hour for fast chargers.

Do we really need to charge at least 8 hours for the first charge?

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Re: Charging batteries for 8 hours

Post by CY on Sun Apr 04, 2010 4:15 pm

No, you don't need to do that. Modern chargers would turn off automatically nowadays after it is full. So leaving it 'charging' for 8 hours would be useless.

AFAIK, the reason behind this was lithium ion batteries had to charge for a few cycles before being able to produce maximum capacity. Charging it for 8 hours is to speed up the process.

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Re: Charging batteries for 8 hours

Post by chongwk on Sun Apr 04, 2010 6:50 pm

Yeah, it would turn off...
But they said, this 8 hours of charging is only for once - the first time charging of new batteries

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Re: Charging batteries for 8 hours

Post by CY on Sun Apr 04, 2010 7:11 pm

Well, it sounds like BS to me. You are aware that modern chargers cut off after full capacity. So, let's say it is a 1 hour charger, what is the point of continuing for 7 more hours when the charger has already cut off the supply? Makes no sense right?

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Re: Charging batteries for 8 hours

Post by simmon on Sun Apr 04, 2010 7:50 pm

My slow charger will charge my batteries for 24 hours Sad

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Re: Charging batteries for 8 hours

Post by chongwk on Sun Apr 04, 2010 8:38 pm

simmon wrote:My slow charger will charge my batteries for 24 hours Sad
eh heh... Razz
sorry ar... this thread I started is about new batteries that newly open, the first time charge


CY wrote:Well, it sounds like BS to me. You are aware that modern chargers cut off after full capacity. So, let's say it is a 1 hour charger, what is the point of continuing for 7 more hours when the charger has already cut off the supply? Makes no sense right?
yeah... it did sounds like BS to me
Here is another sales guy talk, "Oh, even though the power is cut off after full charge, the charger will do maintenance to the battery to make the battery better life"

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Re: Charging batteries for 8 hours

Post by CY on Sun Apr 04, 2010 10:40 pm

That one only for the very pricey ones that is capable to do trickle charging.

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