Lithium battery chargers don't use a timer. The output has voltage and current limits to prevent overcharging.
I know in general that they don't rely on timers for lithium chargers but there have been threads here where some users were seeing some kind of error indication after getting the chargers when they became available. I can't recall what the indication was, a blinking LED I think after say 8 hours charge time.
Either way, I'm pretty sure someone determined it was caused by the Lithium cell not reaching full charge after some unknown time limit. I don't recall if that time limit was ever stated and I did not try and confirm if it was even true.
With that, there very well could be a timed circuit involved as a last case failsafe that shuts the charger down if what was stated is true. I never looked into it any further though as I don't have the external charger and I don't think there was much discussion about it. More likely user error like a cell not inserted correctly resulting in a poor connection.
It may have been Paul himself that mentioned the reason for the error indication before he went in for his treatment for all I remember, it's been a while since I saw anything about it.
I only remember talk about in a thread or so here somewhere and that's it.
I just figured it's worth mentioning here in case users start seeing this and are using lower current power supplies than the OEM supply that comes with the external charger.
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