This will be interesting. Takealot has one huge advantage over them: a well-established efficient logistics network including owning most of what they now use.
Amazon in the US uses numerous carriers and often dumps into the postal service for the final stage. Good luck with doing that here...
The hidden presumption here is that recharging the batteries is the sole cost. However, during time that power is out, you are not paying Eskom when you draw from the batteries.
The actual cost is the 10–20% overhead of the charging circuit and battery recharge efficiency.
A smart user will...