[Power] Checking the life battery of XOs batteries deployed after 3 years of usage

[Xavier Carcelle]

Dear power OLPC folks,

As we work on the NosyKomba, Madagascar team of OLPC France, we are
keeping on expertizing the states of the 200+ xos we deployed there
and we are wondering if we can estimate the life duration of the
batteries we have for the XOs after 3+ years of usage there.

The only simple solution we see if logging the "forth" test of the battery :
ok Testing /battery at 0
AC:off Battery: BYD LiFePO4  68% 6.46V -0.60A 34C discharging Okay

Is there any way of plugging an equipment to check the battery life
and check their states ?

I think there is one-wire protocol between the battery and the
motherboard bus that may be used ?

Thanks for your prompt support as we are on-site currently.

Cheers,

Xavier Carcelle