Battery Voltage

This web server is running on a Raspberry Pi (Model B) powered 100% by Solar energy
 Raspberry Pi
Battery Voltage collected every 5 minutes
Last Updated: Monday, September 20, 20:20:00

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[ERROR: invalid format string '' (should match '^(?:[^%]+|%%)*%s(?:[^%]+|%%)*%lu(?:[^%]+|%%)*%lu(?:[^%]+|%%)*$')]
[ERROR: invalid format string '' (should match '^(?:[^%]+|%%)*%s(?:[^%]+|%%)*%lu(?:[^%]+|%%)*%lu(?:[^%]+|%%)*$')]
[ERROR: invalid format string '' (should match '^(?:[^%]+|%%)*%s(?:[^%]+|%%)*%lu(?:[^%]+|%%)*%lu(?:[^%]+|%%)*$')]
[ERROR: invalid format string '' (should match '^(?:[^%]+|%%)*%s(?:[^%]+|%%)*%lu(?:[^%]+|%%)*%lu(?:[^%]+|%%)*$')]