Don't use magnets w/li-ion cell positive contact issues.
Li-ion technologies has progressed at a rate hard to predict a short year ago.
It's not been that long since JSB pioneered the protected R123 by investing a large sum $$$. The current batch of consumer li-ion cells available in all sort of configurations is direct result.
Sure seems Li-ion mfg sometimes don't have a clue as to what is needed for successful use in the field. making flat top protected or bare li-ion cells meant for consumer devices designed for raised positive nipple may aply.
practice of giving/selling magnets to help make positive contact is not a safe one. even if the li-ion cells is protected, why would somone want to repeatly test the safety device built-in.
best and safest way to for mfg to design a cell with raised positive nipples. but all cells currently in pipeline will be sold reguardless of defective design. witness the li-ion charger that caught on fire early in li-ion technology life-cycle. those same chargers are still being sold on ebay.
next best practice is aply a dab of solder on your board. putting a dab of solder on positive nipple may kill PTC, if you are not quick enough.
supporting use of magnets on positive nipple is a marginal practice at best. magnets will shift, possibly bridging to ground on cell and/or flashlight body. use of magnets on negative end of li-ion cell usually indicates shoddy workmanship.
li-ion cells have very little internal resistance and will discharge at huge amps. hot enough to weld with.
not enough has been made of li-ion cell's inherent dangers when charging. Li-ion cells don't have a peak and will accept a charge for so long as you deliver charging current. most low end li-ion charger will not terminate charge, but will continue to deliver a trickle charge until you unplug charger. never charge your li-ion cells unattended.
charging multi-cell li-ion packs adds further danger to charging li-ion cells. unless you are using a li-ion charger specifically engineered for that particular protected li-ion pack. I'd charge li-ion cells one at a time.
dangers of charging multi-cell li-ion packs is one huge advantage multi-cell NMH packs like M6R enjoys. It's not by accident large mfg of multi-cell packs like Dewalt and Milwaukee is now using Saphion li-ion technology. Until Saphion li-ion cell technology tickles down. Multi-cell NHM packs large enough to drive Surefire M6 will be safer than multi-cell li-ion packs.
Venting with flames is what we want to avoid!
OK, flame-suit on... flame away
Li-ion technologies has progressed at a rate hard to predict a short year ago.
It's not been that long since JSB pioneered the protected R123 by investing a large sum $$$. The current batch of consumer li-ion cells available in all sort of configurations is direct result.
Sure seems Li-ion mfg sometimes don't have a clue as to what is needed for successful use in the field. making flat top protected or bare li-ion cells meant for consumer devices designed for raised positive nipple may aply.
practice of giving/selling magnets to help make positive contact is not a safe one. even if the li-ion cells is protected, why would somone want to repeatly test the safety device built-in.
best and safest way to for mfg to design a cell with raised positive nipples. but all cells currently in pipeline will be sold reguardless of defective design. witness the li-ion charger that caught on fire early in li-ion technology life-cycle. those same chargers are still being sold on ebay.
next best practice is aply a dab of solder on your board. putting a dab of solder on positive nipple may kill PTC, if you are not quick enough.
supporting use of magnets on positive nipple is a marginal practice at best. magnets will shift, possibly bridging to ground on cell and/or flashlight body. use of magnets on negative end of li-ion cell usually indicates shoddy workmanship.
li-ion cells have very little internal resistance and will discharge at huge amps. hot enough to weld with.
not enough has been made of li-ion cell's inherent dangers when charging. Li-ion cells don't have a peak and will accept a charge for so long as you deliver charging current. most low end li-ion charger will not terminate charge, but will continue to deliver a trickle charge until you unplug charger. never charge your li-ion cells unattended.
charging multi-cell li-ion packs adds further danger to charging li-ion cells. unless you are using a li-ion charger specifically engineered for that particular protected li-ion pack. I'd charge li-ion cells one at a time.
dangers of charging multi-cell li-ion packs is one huge advantage multi-cell NMH packs like M6R enjoys. It's not by accident large mfg of multi-cell packs like Dewalt and Milwaukee is now using Saphion li-ion technology. Until Saphion li-ion cell technology tickles down. Multi-cell NHM packs large enough to drive Surefire M6 will be safer than multi-cell li-ion packs.
Venting with flames is what we want to avoid!
OK, flame-suit on... flame away
