26650 batteries are becoming more popular, so I've tested them for continuous load at 0,5 ohm.
TEST SETUP
Tests were carried out in the set-up shown below:
a) battery was placed in charger (of course disconnected, just for hold - charger pins were isolated),
b) as a load was used power resistor 0,5 ohm connected to the battery by switch,
c) to the battery terminals have also been connected:
- multimeter (voltmeter),
- thermocouple from typical thermometer (minus pin).
WARNING - In such constructed circuit the current can reach the 8A level and resistor is heated to more then 100 *C - so be careful
Measurements were finished when the battery voltage dropped to ~3V vaping on mechanical mod below this voltage makes no sense
In such constructed set-up we can observe:
- battery voltage,
- minus pin temperature.
EQUIPMENT UNDER TEST
Each battery was after 3-5 charging cycles.
The RESULTS
The best way to view the results are collective charts for all tested batteries:
For reference on the charts is also the best of the 18650 batteries which I tested before (Samsung INR18650-29E).
As we can see the Keeppower is the best. But ... IMHO only for VV/VW mods... For mechanical mods the Purple Efest is better - it holds voltage above 3.6V till 13th minute, and above 3.3V till 25th minute. Keeppower voltage drops to 3.6V already after 5 minutes.
TEST SETUP
Tests were carried out in the set-up shown below:
a) battery was placed in charger (of course disconnected, just for hold - charger pins were isolated),
b) as a load was used power resistor 0,5 ohm connected to the battery by switch,
c) to the battery terminals have also been connected:
- multimeter (voltmeter),
- thermocouple from typical thermometer (minus pin).
WARNING - In such constructed circuit the current can reach the 8A level and resistor is heated to more then 100 *C - so be careful
Measurements were finished when the battery voltage dropped to ~3V vaping on mechanical mod below this voltage makes no sense
In such constructed set-up we can observe:
- battery voltage,
- minus pin temperature.
EQUIPMENT UNDER TEST
Each battery was after 3-5 charging cycles.
The RESULTS
The best way to view the results are collective charts for all tested batteries:
For reference on the charts is also the best of the 18650 batteries which I tested before (Samsung INR18650-29E).
As we can see the Keeppower is the best. But ... IMHO only for VV/VW mods... For mechanical mods the Purple Efest is better - it holds voltage above 3.6V till 13th minute, and above 3.3V till 25th minute. Keeppower voltage drops to 3.6V already after 5 minutes.
