dicodes Yog's E-PIPE Podręcznik użytkownika - Strona 8

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Battery Status Part 1

The Check battery item displays the battery voltage at low current drain (Ub0) and the

battery voltage under load during the last puff (UbL). The difference is the voltage drop

of the battery (dU). A high voltage drop (e.g. dU>0.4V@20W and dU>0.7V@60W)

indicates a bad battery and/or contact problems.

Please note that every battery has an internal resistance and therefore the voltage at the

contacts will always drop when current is drained. The more current that is drained, the

greater the voltage drop. Always keep this behavior in mind. Common 18650 size

batteries have internal resistances of about 18mW to 80mW. Smaller batteries have even

higher resistances. In general, high capacity batteries have higher internal resistance and

lower capacity batteries have lower internal resistance.

Battery Status Part 2

The E-PIPE one has an additional function that helps the user to evaluate the quality of

the battery and the system contacts on the battery side.

When you are in the menu at the display values for Ub0 and UbL, wait until the values

are highlighted and then press the plus or minus button. Now the battery source

resistance Rb and the voltage drop dU (difference Ub0-UbL) are displayed in increased

accuracy. Each time now one of the keys is pressed, the display changes between

Ub0/UbL and Rb/dU back and forth.

Note that these values may change somewhat as you toggle back and forth because the

battery voltage may change without a load (Ub0), mainly due to temperature change

(cooling) after vaping.

The source resistance of the system is the sum of the internal resistance of the battery as

the main contributor and all contact and wiring resistances of the device. As mentioned

earlier, typical battery resistances vary from 18mW to 80mW depending on the type. The

typical contact and wiring resistances of the E-PIPE one boxes add up to about 6mW.

At high power, the current drawn from a battery results in a significant voltage drop

across the system's source resistor.By far the largest part of the voltage drop is generated

within the battery and not within the device. Please keep this in mind at all times.

The diagram below shows the voltage drop as a function of source resistance for a fully

charged 4.2V battery. If the battery is not fully charged, the voltage drop will increase

even more as more current is needed to provide the same output power.