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I'm trying to understand the spec of a SLA battery. There's a chart which is titled "Cycle Life in Relation to Depth of Discharge":

enter image description here

Can I ask what 'DOC' stands for and the chart is read? How come that line exceeds 100 on the left axis? I presume the left axis represents the percentage of discharge.

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    \$\begingroup\$ it probably exceeds 100% because the marketing intern who made it thought the arc looked cool \$\endgroup\$
    – vicatcu
    Commented Feb 24, 2019 at 15:20
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    \$\begingroup\$ It seems that DOC = Depth Of Discharge \$\endgroup\$
    – G36
    Commented Feb 24, 2019 at 15:23
  • \$\begingroup\$ @G36 Right. But what about the left axis? \$\endgroup\$
    – John M.
    Commented Feb 24, 2019 at 15:36
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    \$\begingroup\$ The left axis is the percentage of discharge. And more than 100% maybe means that the battery was charged above the normal amp-hours capacity. \$\endgroup\$
    – G36
    Commented Feb 24, 2019 at 16:37

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DOC looks like an erroneous contraction of DOD and SOC ...
DoD = Depth of Discharge
SoC = State of Charge

SoC is equal to 100% when the DoD is 0%, and 0% when the DoD is 100%

Regarding exceeding the 100%:

It is sometimes possible for a battery DoD to exceed 100%, if the nominal energy capacity was estimated conservatively, or because of actual operating conditions different from the nominal operating conditions. Source

(the latter already suggested by @G36).

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