Protected battery voltage

[chuck]

I've got four 18350 batteries which when charged stop at 4.2 volts, I've checked this with a multimeter and thers a .1 discrepancy. When I use the battery it stops working at 4 volts, so I'm really getting very little use before putting them on charge again. Is that right, I thought they would drop down to around 3.6-3.7 volts before the protection kicked in?
It's possible I've misunderstood how the protection works, so if someone could clarify I'd be grateful. Thanks .

[DiscoDes]

.1v discrepancy is fine, unless you have a very good multimeter .1v is probably the meters accuracy.

Which batteries did you get? (link please) I thought the protection was to the current output, not the voltage (I may be wrong) so maybe your PV is drawing more current than the protection circuit threshold so they're cutting out.

[chuck]

These are the batteries www.fasttech.com/products/1420/10002173/1156600-trustfire-protected-tf18350-3-7v-1200mah. I bought some off ebay and some off Fasttech.

[DiscoDes]

Read the review on the Fasttech site about the current limit with low ohm atomisers.

What device are you using, what resistance atomiser?

[chuck]

Thanks DiscoDes, they're in a Cube and the atomiser resistance is 2.8 ohm, which I checked with the multimeter. It's a standard vivi nova.

[raid2506]

Mine are Ultrafire protected and drop to about 3.6v no matter what I use them in.

[DiscoDes]

Aug 14, 2013 16:13:08 GMT chuck said:

Thanks DiscoDes, they're in a Cube and the atomiser resistance is 2.8 ohm, which I checked with the multimeter. It's a standard vivi nova.

Even though the atomiser is 2.8 ohm I think it's the batteries, sorry.

Try another make, I use THESE SAFE CHEMISTRY BATTERIES, I have 6 and have no issues.

[chuck]

I kinda thought raid that they should drop below 4v.

[DiscoDes]

Aug 14, 2013 16:20:24 GMT raid2506 said:

Mine are Ultrafire protected and drop to about 3.6v no matter what I use them in.

As it's a Cube mechanical Mod it can only be the batteries, yes?

[chuck]

Des, I did try to find a decent make but the only one I could find in 18350 were the Trustfires.
Thanks

[raid2506]

Aug 14, 2013 16:23:16 GMT DiscoDes said:

Aug 14, 2013 16:20:24 GMT raid2506 said:

Mine are Ultrafire protected and drop to about 3.6v no matter what I use them in.

As it's a Cube mechanical Mod it can only be the batteries, yes?

I'm guessing so you are on the money Des.

I would rig them to an incandescent torch bulb and multi meter in series and see what happens.

[DiscoDes]

Aug 14, 2013 16:24:58 GMT chuck said:

Des, I did try to find a decent make but the only one I could find in 18350 were the Trustfires.
Thanks

chuck

I know mate, good 18350's cheap are hard to find. EFEST & IMR's are good but expensive.

BTW you're not stacking them are you?

I would NOT STACK the one's I have listed

[chuck]

Thanks guys.
I'll be ordering stuff from Fasttech soon, so I'll get a few of the batteries you linked to and try them out.

[chuck]

No, not stacked. It's an 18350 Mod.

[fred]

I've got a couple of the batteries Des linked to, and they're way better than the Ultrafires I have from fasttech