[RE-wrenches] Lithium Ion tool batteries

[Dana Orzel]

Excellent in-depth info thanks 

Dana Orzel
C: 208.721.7003
E- dana at solarwork.com

> On Jan 19, 2022, at 9:58 AM, Alex MeVay <alex at sunforgellc.com> wrote:
> 
> Generally, storage or use at cold temperatures shouldn't be an issue,
> as long as the battery can still deliver enough power to operate the
> tool effectively.
> 
> Charging though...at cold temperatures, ion mobility goes down.  If
> the battery is charged too fast, the lithium ions can't make it into
> the graphite anode fast enough and they start to plate out as metallic
> lithium.  At best, this results in a permanent reduction in capacity.
> Next worst from there, the lithium metal can create an internal soft
> short, immediately or at a later point in time, resulting in high
> self-discharge or a dead cell.  Worst case, it turns into a hard short
> and a fire.
> 
> In theory, the BMS or charger should prevent charging too fast or too
> cold, but who knows if an edge-case like this is actually implemented
> correctly on any particular battery system.    Be careful charging!
> 
> Alex MeVay
> 
> Genasun * Blue Sky Energy * http://sunforgellc.com
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