Battery voltage reading.

[HDMontana]

Hope this is not a dumb question. When you stack 2 18350 batteries, should your device read around 8 volts opposed to around 4 volts for a single 18650? Is it because you are doubling the voltage with 2 batteries. Thanks in advance for any responses.

HD.

 

[schuff]

Yes, fully charged should be 8.4v and depending on the device the cut off will be 6.4v or 6.6v.

Just remember when stacking to follow three simple rules.

First, both batteries need to be near the same age. A year old battery will drain much quicker than a brand new one. This can result in the older battery over discharging.

Second, do not mismatch batteries. A 1100 mah battery and 800 mah battery stacked together obviously will not drain equally also causing possible over discharging.

Third, always make sure both batteries are equally charged. If you put a fully charged 4.2v battery in with a 3.6v partially drained battery the device reads it as 7.8v. If both batteries operate until the device detects low voltage at 6.4 then the battery that started at 3.6v will be drained to around 2.8v which could potentially cause damage to the battery.

 

[HDMontana]

Thanks for the response. Batteries purchased at same time. All are labeled with purchase date and codes to keep pairs together and to alternate which is on top each time. I keep a battery log so I can remember this. Thanks again.

HD.