Comment on Facebook open sources its servers and data centersparentComments−iloveponies15yTheir claims were that the efficiency was that great, and that it's acceptable to pay the extra few dollars in motherboard manufacture to build it in.−Swannie15yI guess in their instance the lifetime of the server was never likely to be eclipsed by that of the battery. In telco, 15-20yrs of operation is not uncommon, so a single set of replaceable/easily service batteries is important.
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Their claims were that the efficiency was that great, and that it's acceptable to pay the extra few dollars in motherboard manufacture to build it in.
I guess in their instance the lifetime of the server was never likely to be eclipsed by that of the battery. In telco, 15-20yrs of operation is not uncommon, so a single set of replaceable/easily service batteries is important.