Quick question on electronics!
12-11-2007 | 05:01 PM
#1
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Quick question on electronics!
Hi guys and girls
Here's one for you,
How long will a 12v 21watt bulb take to fully discharge a 3000mah 7.2v battery pack?
Thanks in advance
Rich
Here's one for you,
How long will a 12v 21watt bulb take to fully discharge a 3000mah 7.2v battery pack?
Thanks in advance
Rich
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12-11-2007 | 06:55 PM
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From: The Black Country!
12-11-2007 | 07:11 PM
#12
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From: The Black Country!
When discharging the pack.. bringing the down to 1.1v-0.8v per cell is fine..
But below that voltage cells in the pack start to become unbalanced and some will discharge lower than others, when the cells start to drop below the reccomended 1.1v-0.8v discharge limit they start to produce gas which starts to build up pressure inside the cell which makes the cell/cells start to vent which loses water and damages the cell/cells permantly.
Which is why you buy a propper piece of discharging piece of equipment like the spintec which not only discharges the pack down to a safe voltage (will cutoff if it senses anything wrong) but it also lowers the internal resistance, increase the voltage, increase runtime, increase capacity and increase the energy of the battery..
so no.. a bulb and a bit of wire won't do the same as Ł50 of propper equipment.. so if you do use the spintec you might make your Rc project go fast..
But to be honest id just go Lipo
I thank you.
But below that voltage cells in the pack start to become unbalanced and some will discharge lower than others, when the cells start to drop below the reccomended 1.1v-0.8v discharge limit they start to produce gas which starts to build up pressure inside the cell which makes the cell/cells start to vent which loses water and damages the cell/cells permantly.
Which is why you buy a propper piece of discharging piece of equipment like the spintec which not only discharges the pack down to a safe voltage (will cutoff if it senses anything wrong) but it also lowers the internal resistance, increase the voltage, increase runtime, increase capacity and increase the energy of the battery..
so no.. a bulb and a bit of wire won't do the same as Ł50 of propper equipment.. so if you do use the spintec you might make your Rc project go fast..
But to be honest id just go Lipo
I thank you.
12-11-2007 | 07:18 PM
#13
PassionFord Post Troll
Joined: Mar 2006
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From: st.annes, blackpool
Originally Posted by Nick.
When discharging the pack.. bringing the down to 1.1v-0.8v per cell is fine..
But below that voltage cells in the pack start to become unbalanced and some will discharge lower than others, when the cells start to drop below the reccomended 1.1v-0.8v discharge limit they start to produce gas which starts to build up pressure inside the cell which makes the cell/cells start to vent which loses water and damages the cell/cells permantly.
Which is why you buy a propper piece of discharging piece of equipment like the spintec which not only discharges the pack down to a safe voltage (will cutoff if it senses anything wrong) but it also lowers the internal resistance, increase the voltage, increase runtime, increase capacity and increase the energy of the battery..
well and truely answered!!
so no.. a bulb and a bit of wire won't do the same as Ł50 of propper equipment.. so if you do use the spintec you might make your Rc project go fast..
But to be honest id just go Lipo
I thank you.
But below that voltage cells in the pack start to become unbalanced and some will discharge lower than others, when the cells start to drop below the reccomended 1.1v-0.8v discharge limit they start to produce gas which starts to build up pressure inside the cell which makes the cell/cells start to vent which loses water and damages the cell/cells permantly.
Which is why you buy a propper piece of discharging piece of equipment like the spintec which not only discharges the pack down to a safe voltage (will cutoff if it senses anything wrong) but it also lowers the internal resistance, increase the voltage, increase runtime, increase capacity and increase the energy of the battery..
well and truely answered!! so no.. a bulb and a bit of wire won't do the same as Ł50 of propper equipment.. so if you do use the spintec you might make your Rc project go fast..
But to be honest id just go Lipo
I thank you.
12-11-2007 | 07:44 PM
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From: Wiltshire
http://cgi.ebay.co.uk/LRP-NiMH-NiCd-...QQcmdZViewItem
so would this one be just as good at 1/5th of the price??
so would this one be just as good at 1/5th of the price??
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