[Openec] RFC: One-Wire-Filesystem (owfs) for charging battery on XO and openec, (long)

[Richard A. Smith]

Frieder Ferlemann wrote:
> Hi Rafael,
> 
> Rafael Enrique Ortiz Guerrero schrieb:
>> Hi frieder,
>>
>> For me is a really good idea, but i dont know if the charging algorithm for
>> the NIMH is an issue anymore, because  afaik these batteries are not going
>> to be deployed and the LIFe batteries have a really easy charging algorithm,

Not quite right.

The official OLPC battery deployment does include NiMH.

LFP is the preferred battery technology and will be the bulk of the 
deployment.  LFP is superior in almost every aspect.  However, LFP has 
almost no long term history.  There is also some question of if there is 
enough Lithium powder to make the quantity of batteries that our goals 
involve.
Because of the lack of history we cannot just drop NiMH from our battery 
list.  ~10% of the battery shipments will be NiMH.  If for some reason 
the LFP batteries have some sort of issue we will ramp up NiMH as 
production as fast a possible.

Both the Laptop and the Bulk Charger will have to support NiMH 
technology for the foreseeable future.

-- 
Richard Smith  <richard at laptop.org>
One Laptop Per Child