Langcjl
March 26, 2011, 7:06am
1
Are there any budget 14500 xm-ls yet?
Don
March 26, 2011, 7:10am
2
There probably shouldn't be. With the current an XM-L wants for full output you are way beyond what is safe for a lithium cobalt 14500. That would be an IMR or LiFePO4 cell only device.
ezeqdb
March 26, 2011, 7:14am
3
Anyway, it could be regulated to 2A, and still be very bright and safe
Don
March 26, 2011, 7:49am
4
That's still above what is wise for LiCo cells. My homemade one pulls 1.8A from a LiCo 14500. If I could find where I put it, I'd check the current with the IMR cell in it.
srfreddy
March 26, 2011, 1:58pm
5
You should really only be pulling 1.4 amps off a LiCO....
is there a thead anywhere on the different battery chemistries? Are my trustfire flame batteries lico?
Don
March 26, 2011, 5:07pm
7
Unless it clearly says different, all lithium batteries are lithium cobalt chemistry. It gives the most energy storage of the various lithium chemistries so is the most common. Lithium polymer cells are also lithium cobalt I believe. IMR cells which can be persuaded to go boom but you have to work at it, are lithium manganese. Lithium iron (LiFePO4) cells can't be persuaded to go boom though no doubt someone, somewhere has succeeded in doing it.
The Wikipedia stuff on rechargeable batteries is not bad at all. Better than many an article there.
A rechargeable battery, storage battery, or secondary cell (formally a type of energy accumulator), is a type of electrical battery which can be charged, discharged into a load, and recharged many times, as opposed to a disposable or primary battery, which is supplied fully charged and discarded after use. It is composed of one or more electrochemical cells. The term "accumulator" is used as it accumulates and stores energy through a reversible electrochemical reaction. Rechargeable batteries a...
The lead–acid battery is a type of rechargeable battery first invented in 1859 by French physicist Gaston Planté. It is the first type of rechargeable battery ever created. Compared to modern rechargeable batteries, lead–acid batteries have relatively low energy density. Despite this, they are able to supply high surge currents. These features, along with their low cost, make them attractive for use in motor vehicles to provide the high current required by starter motors. Lead–acid batteries suff...
The nickel–cadmium battery (Ni–Cd battery or NiCad battery) is a type of rechargeable battery using nickel oxide hydroxide and metallic cadmium as electrodes. The abbreviation Ni–Cd is derived from the chemical symbols of nickel (Ni) and cadmium (Cd): the abbreviation NiCad is a registered trademark of SAFT Corporation, although this brand name is commonly used to describe all Ni–Cd batteries.
Wet-cell nickel–cadmium batteries were invented in 1899. A Ni–Cd battery has a terminal voltage during ...
The nickel–iron battery (NiFe battery) is a rechargeable battery having nickel(III) oxide-hydroxide positive plates and iron negative plates, with an electrolyte of potassium hydroxide. The active materials are held in nickel-plated steel tubes or perforated pockets. It is a very robust battery which is tolerant of abuse, (overcharge, overdischarge, and short-circuiting) and can have very long life even if so treated.
It is often used in backup situations where it can be continuously charged
A nickel–metal hydride battery (NiMH or Ni–MH) is a type of rechargeable battery. The chemical reaction at the positive electrode is similar to that of the nickel-cadmium cell (NiCd), with both using nickel oxide hydroxide (NiOOH). However, the negative electrodes use a hydrogen-absorbing alloy instead of cadmium. NiMH batteries can have two to three times the capacity of NiCd batteries of the same size, with significantly higher energy density, although only about half that of lithium-ion ba...
A nickel–zinc battery (Ni–Zn battery or NiZn battery) is a type of rechargeable battery similar to nickel–cadmium batteries, but with a higher voltage of 1.6 V.
Larger nickel–zinc battery systems have been known for over 100 years. Since 2000, development of a stabilized zinc electrode system has made this technology viable and competitive with other commercially available rechargeable battery systems. Unlike some other technologies, trickle charging is not recommended.
In 1901 Thomas Alva Ed...
A lithium-ion or Li-ion battery is a type of rechargeable battery that uses the reversible intercalation of Li+ ions into electronically conducting solids to store energy. In comparison with other commercial rechargeable batteries, Li-ion batteries are characterized by higher specific energy, higher energy density, higher energy efficiency, a longer cycle life, and a longer calendar life. Also noteworthy is a dramatic improvement in lithium-ion battery properties after their market introducti...
A lithium polymer battery, or more correctly lithium-ion polymer battery (abbreviated as LiPo, LIP, Li-poly, lithium-poly and others), is a rechargeable battery of lithium-ion technology using a polymer electrolyte instead of a liquid electrolyte. Highly conductive semisolid (gel) polymers form this electrolyte. These batteries provide higher specific energy than other lithium battery types and are used in applications where weight is a critical feature, such as mobile devices, radio-controlled a...
There are other technologies such as sodium-sulphur batteries but you aren't going to see them in a light since they need to be at above 350C to operate.
srfreddy
March 26, 2011, 5:54pm
8
lifipo4.... hm.... lets see, how about shorting 2 differently charged ones in parallel? And then hammerering then open with a chisel while you're at it?
Don
March 26, 2011, 6:04pm
9
While "warming" them with a welding torch ;)
