Battery discharge safety question

[Mrsmac]

Hi everyone. I have w new toy today the Dicodes Dani (love it so far!) and it has the option to set the point at which the mod will reduce power supplied to the coil.

i am currently using Efest IMR 18650 and 18490 v2 batteries. It never had to worry before about setting anything to do with the battery as my zmax's usually cut off at 3.4volts.

the Dani comes with it set at 3v default, not sure if I should change this, any thoughts?

[geordie_vaper]

i remember VapingBad mention somthing similar in another thread him and ronaldo are the go to people about all things battery related

[Greg]

Mrsmac geordiepoints you to the right people

I'd imagine 3v is fine if that's the default but I really don't know, maybe set it at 3.4 for now which will be fine until the battery gurus turn up

At least then you know your safe pending the definitive.

[Ripshod]

The higher you set it Mrsmac the less you'll stress the battery and the longer it'll last you (lifetime, not charge)

I consider 3.2V to be the limit (personally) but certainly no harm setting it at 3.4
tagging hijack

[thatguy]

Efest themselves state that the max discharge should be 2.5V, so 3 V should be fine. 3V probably a safer bet since we all know battery manufacturers love to overstate specs.  Anyway, lower voltages wont vape as well even on VV mods, so I;d go a bit higher than that on E-cigs. 3.2-3.4 seems a good choice.  Can take lower on torches etc.

[fiddles]

quote from batteryuniversity.com/learn/article/charging_lithium_ion_batteries

Over-discharging Lithium-ion

Li-ion should never be discharged too low, and there are several safeguards to prevent this from happening. The equipment cuts off when the battery discharges to about 3.0V/cell, stopping the current flow. If the discharge continues to about 2.70V/cell or lower, the battery’s protection circuit puts the battery into a sleep mode. This renders the pack unserviceable and a recharge with most chargers is not possible. To prevent a battery from falling asleep, apply a partial charge before a long storage period.
Battery manufacturers ship batteries with a 40 percent charge. The low charge state reduces aging-related stress while allowing some self-discharge during storage. To minimize the current flow for the protection circuit before the battery is sold, advanced Li-ion packs feature a sleep mode that disables the protection circuit until activated by a brief charge or discharge. Once engaged, the battery remains operational and the on state can no longer be switched back to the standby mode.
Do not recharge lithium-ion if a cell has stayed at or below 1.5V for more than a week. Copper shunts may have formed inside the cells that can lead to a partial or total electrical short. If recharged, the cells might become unstable, causing excessive heat or showing other anomalies. Li-ion packs that have been under stress are more sensitive to mechanical abuse, such as vibration, dropping and exposure to heat.

[Mrsmac]

Thanks guys for responding, with the zmax's it cuts out at 3.4 and with the mechs, the vape is once it drops from 3.7.

So far I'm seeing 3.0 to 3.2 roughly and I should be ok. I hoe I have read the manual right and that is where it will shut off

Dan are you around as well? I know you have had the Dani and who is the other person not sure if it is smifee or scooby

[ronaldo]

3v is a safe level to set it to but I would change it to3.2v myself as it is better for your batteries

[Mrsmac]

Thanks guys, appreciate all your help

[Dan]

I use efest 18490s and the battery cutoff is set to 2.6v.

yes you'll get more lifetime out of the batteries if you set it to 3v or 3.2v but it's not as if batteries will break the bank.. I'd rather get the most out of a £150 device per charge than a £7 battery

I usually change batteries when the power reduces but haven't taken the time to check what that is lol

bare in mind.. the sb is an "under load" reading so the true voltage won't actually be that low