presta
Legendary Member
It's lithium batteries in particular that are the notorious arsonists, they require particularly complex battery management because they can develop short circuits if discharged too deeply.
Safe recharging of lights overnight
- Thread starter johnnyb47
- Start date
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Vantage
Carbon fibre... LMAO!!!
- Location
- Behind everyone else, Bolton
When you consider how many of these rechargeable lights are sold and constantly recharged over and over again, one or two batteries going poof is no big problem. You're as likely to have a driver park his/her car in your living room after a police chase.
Luckily for me, my living room is at the back of the house and the house is at the top of 18 steps
Luckily for me, my living room is at the back of the house and the house is at the top of 18 steps
classic33
Leg End Member
No guarantee, a house, 50 yards from the road, nearly had a car come through a bedroom(first floor) via the roof.When you consider how many of these rechargeable lights are sold and constantly recharged over and over again, one or two batteries going poof is no big problem. You're as likely to have a driver park his/her car in your living room after a police chase.
Luckily for me, my living room is at the back of the house and the house is at the top of 18 steps
Driver swore he wasn't doing over 30 at the time car & road parted company!!
Pale Rider
Legendary Member
When you consider how many of these rechargeable lights are sold and constantly recharged over and over again, one or two batteries going poof is no big problem. You're as likely to have a driver park his/her car in your living room after a police chase.
Luckily for me, my living room is at the back of the house and the house is at the top of 18 steps
Planning guidelines suggest not having a ground floor bedroom at the front of the house, which will often mean the living room is the room at the front.
External noise is one reason, but car/house crashes tend to happen in the early hours when a bedroom is more likely to be occupied.
Ajax Bay
Guru
- Location
- East Devon
Yes.
A USB port offers charging voltage of up to 5v and can give 500 mA output max so provides 5v x 0.5 amps = 2.5w
I use a front light with a separate battery (lithium ion), the charger for which offers 8.4v and 1 amp - the battery is 8.4v nominal (4 x 18650 batteries in series parallel) and rated as 4400mAh.
The batteries you can charge using a USB are quite small (ie low capacity and voltage). Not sure whether that makes them less or more likely to catch fire but the power going into them is much less.
I agree with this ^^^^^. My batteries are from Magicshine.
From Battery University: "Lithium-ion operates safely within the designated operating voltages; however, the battery becomes unstable if inadvertently charged to a higher than specified voltage. Prolonged charging above 4.30V on a Li-ion designed for 4.20V/cell will plate metallic lithium on the anode. The cathode material becomes an oxidizing agent, loses stability and produces carbon dioxide (CO2). The cell pressure rises and if the charge is allowed to continue, the current interrupt device (CID) responsible for cell safety disconnects at 1,000–1,380kPa (145–200psi). Should the pressure rise further, the safety membrane on some Li-ion bursts open at about 3,450kPa (500psi) and the cell might eventually vent with flame. (See BU-304b: Making Lithium-ion Safe.) Venting with flame is connected with elevated temperature. A fully charged battery has a lower thermal runaway temperature and will vent sooner than one that is partially charged."
Tenacious Sloth
Guru
- Location
- Huntingdon, UK
I must admit to worrying about this in the past, particularly as front cycle lights can take several hours to charge.
I now have a dynamo hub on my commute bike which has removed the problem. The dynamo-powered light also has a much better beam, so win-win.
Graham
I now have a dynamo hub on my commute bike which has removed the problem. The dynamo-powered light also has a much better beam, so win-win.
Graham
Drago
Legendary Member
- Location
- Suburban Poshshire
Look at the Apple and Samsung phones that have gone pop, yet no one gives a second thought to charging their hypno-phones while they sleep
Tenacious Sloth
Guru
- Location
- Huntingdon, UK
HLaB
Marie Attoinette Fan
I'm pretty fortunate with the advent of usb I can charge most things up at work. In the rare event I need to top at home I usually don't charge lights overnight. I have once or twice though left them plugged in to the laptop which will go into stan by after a while.
- Location
- London
I trust as a modern man you take the extra precaution of placing her between you and the potential blast zone?
In truth, though a cautious sort, I have no problem with recharging all sorts of stuff overnight. But then it's all from proper manufacturers/sources. I do buy some simple bits direct from China but I'd never buy anything electronic for what, to me, are pretty obvious reasons.
- Location
- London
Is that true? As a planning precaution/rule? It's hardly very likely that a car is going to land or your bed is it? Anyone who worried about that (not saying you) should surely get out more/live a little.
mjr
Comfy armchair to one person & a plank to the next
- Location
- mostly Norfolk, sometimes Somerset
View: https://www.youtube.com/watch?v=so-0slsg2bY
Parents - don't let your children grow up to be motorists!
mjr
Comfy armchair to one person & a plank to the next
- Location
- mostly Norfolk, sometimes Somerset
Not very likely but the consequences are pretty horrific and it's relatively easily avoidable so why not make it a planning guideline? Not a rule like some of the fire and flood regulations (the flood regs also limit when you can have ground-floor bedrooms in flood risk zones IIRC), but a guideline.
If the lid is on tight there won't be a decent supply of oxygen to support combustion ( unless you have made a big hole to put the wires through ).
Triangle of fire .
