The Lidl Ultimate Speed UPK 10 H5 (also sold as a jump starter / power bank / compressor unit) has fairly well-documented specs.
Here are the key values you asked for:
—
🔋 Battery capacity (mAh)
14,000 mAh (internal Li-ion/LiFePO4 pack)
However:
The usable USB capacity is lower
It is specified as:
8,400 mAh at 5 V output
This is normal due to voltage conversion losses (internal ~3.2–12 V system → 5 V USB).
—
⚡ Energy capacity (mWh / Wh)
44.8 Wh (watt-hours)
Equivalent in mWh:
44,800 mWh
So:
✔ Internal energy: 44,800 mWh
—
🔌 Output current (USB)
USB outputs
USB-A: 5 V / 1 A
USB-C: 5 V / 2 A
Combined total output: 3 A max
So:
✔ At 5 V: up to 3 A total
—
🚗 12 V output (jump starter function)
This is not a continuous USB-type output, but a starter pulse system:
12 V vehicle jump-start mode
Peak current: up to 200 A (short burst)
Some specs mention 400 A peak (very short surge)
Important:
This is not usable as a 12 V power supply
It is only for engine cranking pulses
—
📊 Summary
Spec Value
Internal capacity 14,000 mAh
Usable USB capacity 8,400 mAh @ 5 V
Energy 44.8 Wh (44,800 mWh)
USB output 5 V / 1 A + 5 V / 2 A
Max USB current 3 A total
12 V function Jump start only
Peak current (12 V) 200–400 A (short burst)
—
If you want a useful interpretation
It’s roughly a 45 Wh battery pack
Equivalent to about:
~12,000 mAh at true 3.7 V cell level
but marketed as 14,000 mAh (standard internal rating method)