How long does it take to recharge a Power bank?

The charging time of a power bank depends on the charger and cable used, as well as the power bank’s specifications.

Also, another influencing factor is the energy efficiency of the recharging process, i.e.:

To achieve a full recharge of the power bank, any charger will always supply more energy than is stored in the internal battery of the power bank.

This excess energy, manifested in the form of heat, will depend on the quality of the cable used and the internal circuitry of the power bank that manages the battery charging process.

The energy efficiency in recharging a power bank can be expressed by the following formula:

Recharging Efficiency = (Power bank stored energy / Charger supplied energy) x 100.

Our tests found that the average efficiency in the Standard Recharge process (5V) of a power bank was 85%.

This means that the charger must supply 15% more energy than the power bank’s internal battery stores.

With this information, we can use the following formula to estimate the minimum time required to recharge a power bank fully:

Min. charging time = [Power bank stored energy (Wh) / Max. input power (W)] x Efficiency

In addition, the following considerations must be taken into account to use this formula:

  1. The power bank charges constantly at the maximum power on the USB input port.
  2. A charger that supplies this power is used.
  3. The efficiency of the recharging process is 85% (multiplied by 1.15).

Disclaimer:

Logically, a power bank does not recharge at a constant power nor is it possible to know the energy efficiency when recharging, but using this formula allows us to know in advance the estimated charging time.

For example, if we are interested in buying a high-capacity power bank, 20000 mAh, and we have seen 3 models with a similar price, we can use this formula to choose the model that charges faster:

Models Max. Input Power Min. Charging Time
PB01 5 W (74 Wh / 5 W) x 1,15 = 17 h
PB02 10 W (74 Wh / 10 W) x 1,15 = 8,5 h
PB03 18 W (74 Wh / 18 W) x 1,15 = 4,7 h

Finally, in the following table we can analyze, with real data, the time and efficiency of the charging process of some models tested by our team, both standard and fast charging:

BrandModelRecharge TypeUSB Input PortCharging Time (h)Avg. Charging VoltageBattery Energy (Wh)Supplied Energy (Wh)Recharging Efficiency (%)
BlitzWolfBW-P6StandardMicro-USB4.515.2737.048.3676.51
BlitzWolfBW-P6QC 2.0Micro-USB3.19.3637.047.478.05
TronsmartPBT10StandardMicro-USB5.565.2437.044.7582.68
TronsmartPBT10QC 2.0Micro-USB3.699.3337.044.3983.36
XiaomiPLM02ZMStandardMicro-USB5.715.2638.546.8482.19
XiaomiPLM02ZMQC 2.0Micro-USB3.619.3538.546.8382.21
XiaomiPLM09ZMStandardMicro-USB6.025.137.043.4985.08
XiaomiPLM09ZMQC 2.0Micro-USB4.239.0837.044.7482.7
XiaomiPLM01ZMStandardUSB-C6.825.1239.1949.4779.23
XiaomiPLM01ZMQC 2.0USB-C3.4412.1239.1950.2877.95
AnkerA1261StandardMicro-USB4.995.0938.544.9685.63
AnkerA1261QC 2.0Micro-USB3.479.0838.543.5488.42
RAVPowerRP-PB077StandardMicro-USB4.455.2838.043.9986.38
RAVPowerRP-PB077QC 2.0Micro-USB3.3411.9938.042.6589.1
ElecjetGen 4StandardUSB-C3.075.2533.335.992.76
ElecjetGen 4PDUSB-C0.7720.0933.332.87101.31
OmarsOMPB10KStandardUSB-C4.695.0637.043.884.47
OmarsOMPB10KPDUSB-C3.079.0937.044.982.41
TqkaKA023StandardMicro-USB8.255.1637.040.4791.43
TqkaKA023QC 2.0Micro-USB4.159.3237.043.1885.69
TqkaKA023PDUSB-C4.139.0837.042.5586.96
KinpsKP-S010StandardMicro-USB5.185.2737.043.7484.59
UgreenPB108StandardUSB-C3.925.0138.043.4987.38
UgreenPB108QC 2.0USB-C2.839.0738.043.7886.8
DuracellPB3StandardMicro-USB4.895.2336.540.989.24
PoweraddMP-TC018GYStandardMicro-USB4.715.0937.044.2583.62
AideazID1001StandardUSB-C5.645.2336.046.6377.2
AideazID1001QC 2.0USB-C3.889.3236.047.2876.14
AideazID1001PDUSB-C3.859.0836.046.1977.94
TronsmartPBD01StandardUSB-C5.015.0937.043.4885.1
TronsmartPBD01QC 2.0USB-C3.489.0837.044.1783.77
TronsmartPBD01PDUSB-C3.439.0837.043.9684.17
AukeyPB-N50StandardMicro-USB6.025.1137.045.381.68
BaseusBS-P10KQ02StandardUSB-C5.165.2437.044.4483.26
BaseusBS-P10KQ02QC 2.0USB-C3.7412.0737.046.4579.66
BaseusBS-P10KQ02PDUSB-C3.7312.0137.046.0180.42
ZendureZDA3TCStandardUSB-C4.425.0637.038.2396.78
XnuoyoXP2StandardMicro-USB3.955.2337.034.66106.75
CharmastW1040PStandardUSB-C5.085.0838.4842.7889.95
CharmastW1040PQC 2.0USB-C3.3712.1338.4845.7684.09
CharmastW1040PPDUSB-C3.2912.0138.4844.2387.0
OzkuC1001StandardUSB-C4.615.2637.041.9788.16
OzkuC1001QC 2.0USB-C3.3112.0537.044.6882.81
OzkuC1001PDUSB-C3.2712.0137.044.0783.96
ZendureZDA3PDStandardUSB-C4.245.2437.038.8995.14
ZendureZDA3PDQC 2.0USB-C3.1212.0637.040.5191.34
ZendureZDA3PDPDUSB-C3.0212.0137.038.7495.51
PoweraddSlim 2StandardMicro-USB3.495.1318.520.2691.31
AukeyPB-Y13StandardUSB-C4.855.2537.042.2387.62
AukeyPB-Y13PDUSB-C3.669.0837.042.8986.27
AnkerA1109StandardMicro-USB3.55.0618.524.0177.05
AukeyPB-N54StandardMicro-USB3.395.0618.522.1183.67
AukeyPB-N41StandardMicro-USB3.065.1118.521.0687.84
BonaiBNPBM58-9GNStandardMicro-USB2.865.1121.4621.07101.85
OmarsSlim PackStandardUSB-C2.395.0518.522.1283.63
RomossQS05StandardMicro-USB2.795.0618.522.4782.33
RAVPowerRP-PB060StandardMicro-USB3.985.1224.7927.8589.01
XiaomiPLM10ZMStandardMicro-USB2.695.0518.522.1783.45
PoweraddEnergyCellStandardMicro-USB5.545.0637.040.8190.66
PoweraddEnergyCellStandardMicro-USB3.045.1218.519.992.96
TeckNetIEP1010StandardMicro-USB4.825.0637.045.7180.95
TeckNetIEP1010QC 2.0Micro-USB3.349.0737.046.280.09
TeckNetIEP1010PDUSB-C3.369.2837.046.0880.3
XnuoyoXPB-1WStandardMicro-USB5.215.0637.044.3683.41
OmarsSlim PackStandardUSB-C4.335.1837.044.5383.09
AukeyPB-XN10StandardUSB-C3.285.0537.040.691.13
XiaomiPLM03ZMStandardUSB-C5.625.3238.548.7678.96
XiaomiPLM03ZMQC 2.0USB-C3.7512.738.548.9978.59
OmarsOMPB20KPLTStandardUSB-C6.545.0474.093.0879.5
OmarsOMPB20KPLTPDUSB-C3.5320.0774.087.8484.24
AideazID1002StandardUSB-C11.455.2972.090.7479.35
AideazID1002QC 2.0USB-C7.612.272.093.876.76
AideazID1002PDUSB-C7.5712.1372.092.9977.43
AukeyPB-T10StandardMicro-USB7.325.3674.088.1383.97
ElecjetA5StandardUSB-C2.25.2818.518.08102.32
ElecjetA5PDUSB-C0.6616.118.519.2496.15
PoweraddPilot X7StandardMicro-USB8.485.2974.090.3181.94
ZMIQB822StandardUSB-C8.985.3474.089.7782.43
ZMIQB822QC 2.0USB-C6.899.5474.091.5280.86
ZMIQB822PDUSB-C6.019.0174.088.0384.06
XiaomiPLM07ZMStandardUSB-C8.055.3174.088.383.81
XiaomiPLM07ZMQC 2.0USB-C5.2212.7174.087.6684.42
XiaomiPLM07ZMPDUSB-C3.6815.1374.090.5881.7
AukeyPB-N36StandardMicro-USB8.845.2874.082.2589.97
AukeyPB-Y11StandardUSB-C7.695.374.096.7476.49
AukeyPB-Y14StandardUSB-C7.745.374.096.2176.92
XiaomiPLM11ZMStandardUSB-C4.385.3437.045.1282.0
XiaomiPLM11ZMQC 2.0USB-C3.389.1737.045.5181.3
XiaomiPLM11ZMPDUSB-C3.349.0337.045.182.04
RAVPowerRP-PB043StandardMicro-USB8.175.2374.3778.2695.04
RAVPowerRP-PB043QC 2.0Micro-USB4.947.5274.3782.690.03
PoweraddEnergyCellStandardUSB-C7.775.3274.095.977.17
PoweraddEnergyCellQC 2.0USB-C5.89.2174.090.981.41
PoweraddEnergyCellPDUSB-C5.869.0374.090.2781.98
RAVPowerRP-PB159StandardMicro-USB9.265.2672.3683.0987.08
RAVPowerRP-PB159PDUSB-C3.3920.372.3675.6895.62
RAVPowerRP-PB159PDUSB-C3.3920.372.3675.6895.62
RomossSW20 ProStandardUSB-C8.575.2874.082.0690.18
RomossSW20 ProPDUSB-C5.879.0174.086.1885.87
UgreenPB132StandardUSB-C7.944.8274.089.1383.03
UgreenPB132QC 2.0USB-C5.349.5574.088.0284.07
UgreenPB132PDUSB-C6.3112.1974.089.612782.58
TeckNetiEP12000StandardUSB-C8.044.8374.083.0689.09
TeckNetiEP12000QC 2.0USB-C6.099.5274.085.4486.61
TeckNetiEP12000PDUSB-C6.079.0274.083.5488.58
LitioniteVulcanStandardUSB-C7.714.9174.092.9879.59
LitioniteVulcanQC 2.0USB-C4.989.1974.084.2787.81
LitioniteVulcanPDUSB-C1.8619.874.083.7988.32
dodocoolDP13StandardUSB-C8.985.3172.3683.7186.44
dodocoolDP13PDUSB-C3.4620.372.3682.1788.06
dodocoolDP13PDUSB-C3.4620.372.3682.1788.06
BlitzWolfBW-P8StandardUSB-C8.235.2374.084.7587.32
BlitzWolfBW-P8PDUSB-C3.1820.374.078.993.79
BlitzWolfBW-P8PDUSB-C3.1820.374.078.993.79
CharmastW2002PStandardUSB-C7.824.8499.1689.47110.83
CharmastW2002PQC 2.0Micro-USB5.469.299.1689.18111.19
CharmastW2002PPDUSB-C5.579.0199.1689.4110.92
PoweraddPilot Pro 4StandardMicro-USB17.625.399.16143.0469.32
PoweraddEnergyCell llStandardUSB-C3.055.1337.037.1599.6
PoweraddEnergyCell llPDUSB-C2.399.0537.032.78112.87
LitioniteNJF-2StandardDC2.8819.092.583.9110.25
LitioniteNJF-2StandardDC2.8819.092.583.9110.25
LitioniteNJF-2StandardDC2.8819.092.583.9110.25
LitioniteNJF-2StandardDC2.8819.092.583.9110.25
YaberYR700StandardDC5.0815.2681.474.06109.91
YaberYR700StandardDC5.0815.2681.474.06109.91
X-DragonXD-PB-021StandardUSB-C7.264.8899.1672.54136.7
X-DragonXD-PB-021QC 2.0USB-C4.849.5399.1677.15128.53
X-DragonXD-PB-021PDUSB-C5.449.0399.1674.22133.6
OmarsOMPB20PW40GYCJNLStandardUSB-C10.215.2272.086.6783.07
OmarsOMPB20PW40GYCJNLPDUSB-C2.0720.2172.078.0692.24
OmarsOMPB20PW40GYCJNLPDUSB-C2.0720.2172.078.0692.24
RAVPowerRP-PB186StandardUSB-C4.035.3236.339.1792.67
RAVPowerRP-PB186PDUSB-C2.512.1736.338.7193.77
RAVPowerRP-PB186PDUSB-C2.512.1736.338.7193.77
RAVPowerRP-PB186PDUSB-C2.512.1736.338.7193.77
EC TechnologyPB05StandardUSB-C7.985.2599.1689.34110.99
EC TechnologyPB05QC 2.0USB-C6.019.5299.1689.1111.29
EC TechnologyPB05PDUSB-C6.012.299.1690.13110.02
XiaomiPLM06ZMStandardMicro-USB9.255.3274.088.2383.87
XiaomiPLM06ZMQC 2.0Micro-USB6.319.5474.091.1681.18
BlitzWolfBW-P9StandardMicro-USB4.45.2737.042.2387.62
BlitzWolfBW-P9QC 2.0Micro-USB3.29.237.042.6786.71
BlitzWolfBW-P9PDUSB-C4.212.1837.042.8586.35
FlyLinkTechJ17BStandardUSB-C7.435.3599.1688.82111.64
FlyLinkTechJ17BQC 2.0Micro-USB5.929.1999.1689.5110.79
FlyLinkTechJ17BPDUSB-C5.989.0399.1688.63111.88
RedmiPB200LZMStandardUSB-C10.275.2974.091.9380.5
RedmiPB200LZMQC 2.0USB-C6.769.274.091.5480.84
TackLifeT8StandardDC4.3415.1766.662.87105.93
TackLifeT8StandardDC4.3415.1766.662.87105.93
BlavorPN-W12StandardUSB-C8.184.9374.094.7778.08
BlavorPN-W12QC 2.0USB-C5.839.5574.090.9981.33
BlavorPN-W12PDUSB-C6.099.0474.090.6481.64
PoweraddEnergyCell llStandardUSB-C12.585.2999.16123.1880.5
PoweraddEnergyCell llPDUSB-C4.4320.2299.16109.2390.78
PoweraddEnergyCell llPDUSB-C4.4320.2299.16109.2390.78
UgreenPB178StandardUSB-C4.084.838.544.3586.81
UgreenPB178QC 2.0USB-C2.919.0738.545.1585.27
UgreenPB178PDUSB-C2.939.0238.546.083.7
CharmastC2023StandardUSB-C8.465.0388.0692.9794.72
CharmastC2023FCP/ACPUSB-C6.219.1788.0689.9497.91
CharmastC2023PDUSB-C6.09.0288.0687.22100.96
BaseusBS-30KP365StandardUSB-C12.224.91114.0143.8679.24
BaseusBS-30KP366QC 2.0USB-C7.619.05114.0132.3786.12
BaseusBS-30KP367PDUSB-C4.3115.51114.0141.980.34
BaseusBS-30KP367PDUSB-C4.3115.51114.0141.980.34
AnkerA1239StandardUSB-C8.385.236.339.4891.95
AnkerA1239PDUSB-C2.5615.2536.339.0193.05

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