When to get new batteries?

[SJClouds]

Hey I've tried searching for the answer but I couldn't find anything. I have 2 of the blue samsung 25r batteries and I'm wondering how long does one battery usually last until you need to get a new one? Do you see how many mah's it charges to until you know when to replace them? My batteries charge to around 2300 mah's right now how do I know when I need to get new ones?

 

[Semiretired]

When you feel it just is not lasting as long as you would like it to. For example - I rotate several batts - all 18650s 2000mah - they used to last me 1.5 days easy - now they last about 1 - 1.1 days (still enough for me). They are about 2.5 years old.

I need to add - also if you damage them.

 

[SJClouds]

When you feel it just is not lasting as long as you would like it to. For example - I rotate several batts - all 18650s 2000mah - they used to last me 1.5 days easy - now they last about 1 - 1.1 days (still enough for me). They are about 2.5 years old.

I need to add - also if you damage them.

Wow ok so the batteries can last a couple of years then. I thought you would have to change them in a couple of months cause my battery lasts me about a day or so it used to last me almost 2 days also when I first got them.

 

[EBates]

Here is the spec sheet on the INR18650-25R.
https://cdn.shopify.com/s/files/1/0674/3651/files/Samsung_INR18650-25R.pdf?835
I haven't found anything indicating a 'life expectancy' but YRMV.
Good Luck

 

[sando7]

have herd, but it's not confirmed...when your battery reaches 70% of it's holding capacity....

so with the Samsung 25R that would be when it only holds 1750mAh.....you might want to check my math

 

[Semiretired]

Wow ok so the batteries can last a couple of years then. I thought you would have to change them in a couple of months cause my battery lasts me about a day or so it used to last me almost 2 days also when I first got them.

It all depends upon how many you have in rotation and how low you drain them. I change batts at the first sign of a drop in vape instead of waiting for my PV to tell me they need changing - it adds to the life of the battery because full draining followed by full charging takes the most life from a batt.

 

[Jugband]

I never keep batteries longer than a year, no matter what.

 

[SJClouds]

I'm using a sigelei 50w box and the volts change .1 for some reason is that because of the box or cause of the battery? Like sometimes when I turn it on it reads 3.8v but then when I'm using it for a little bit it will sometimes drop to 3.7v is that because of the battery? Sometimes it even jumps back to 3.8v

 

[foolswithsometools]

I'm using a sigelei 50w box and the volts change .1 for some reason is that because of the box or cause of the battery? Like sometimes when I turn it on it reads 3.8v but then when I'm using it for a little bit it will sometimes drop to 3.7v is that because of the battery? Sometimes it even jumps back to 3.8v

No its not the battery, its likely the resistance changing slightly (maybe the 510 connection isnt super solid? and your vape auto-adjusting your voltage to keep it at the power you set it to. The way that these chips work, a small change in input voltage wont affect a thing, its why you get the same kind of regulated vape with charged batteries or dead ones