Bought this for a road trip and had enough advance beforehand to thoroughly test the power consumption and temperature. First cup was DOA... sent it back and got a replacement that worked well.
For testing I used a standard PC USB port, a car 12v adapter, and two USB charging blocks. Over the course of all testing time ambient air temperature was 73° while the cup's liquid temperature always started at 130° and the cup's lid was in place at all times except for once per 30 minutes when it was removed to take temperature readings.
For PC testing I used a standard USB 2.0 port and monitored power flow and temperature data for 12 hours. The average power draw was 500 mA ±10 mA at 5 volts for 2.5 watts power. Within 4 hours the temperature in the liquid had dropped to a very disappointing 99°... barely tepid. It maintained that temperature for the next 8 hours.
For testing with a USB power block I used both the Anker A1257 and the Rayovac PS95 to verify draw, temperature and other factors were not affected by any individual device incompatibility. The Anker A1257 is a 15600 mAh pack operating at 3.7 volts for 57.72 watt hours total capacity while the Rayovac is a 16000 mAh pack operating at 3.7 volts for 59.2 watt hours. Power draw for both packs was 850 mA ± 40 mA at 5 volts for 4.25 watts power consumption. The Anker battery was drained after 13 hours while the Rayovac lasted 14 hours while the cup's contents maintained a tolerable 114°. (luke-warm) Performance with a 12v adapter in a car was nearly identical as with the power blocks. (draw of 850 mA with 114° liquid temperature)
Having the cup made for a very pleasant drive and I even used the battery packs while walking around (pack in the purse with the cord running to the cup in my hand) for continuous warm coffee. (VERY nice once it turned cold at night)
Cup's plug broke while on the trip (my fault... it was plugged in when I took a fall and it broke the plug off in the cup) so now I need to find a new one... but I hope this technology improves to allow 1 or 2 amp draw over USB (it already is done to charge devices... why not to power them?) to allow for a much better implementation of this system. (either that or just better isolation of the cup to retain heat better)
All in all a worthy buy, but falls just short of being all it can be and seemingly for just lack of caring to improve the design.
| Brand | Princess |
| Color | Blue |
| Special Feature | Spill Proof, Insulated |
| Style | Modern |
| Theme | Car |
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