Another stupid battery question!

[mowjo]

Ok folk! I just ordered some of these from Torchy as they seem to be what everyone recommends, 2x Green 30A Samsung 25R INR18650-25R 2500mAh 18650 3.7v Li-ion batteries +case, but I noticed while checking they do a Blue version are they the same battery's as I can find no difference apart from the case colour, I know it's a stupid question but my OCD has kicked in and it's really bugging me,,

Mowjo,,,

[Q]

The green ones are the newer version, some people say they've had better life from them, I've got both and they are the same to me

They are also available on FT and they ARE genuine, £6.25 for 2, but cheaper if you buy multiples, and only taking 14-21 days to arrive

[mowjo]

Thanks Q! OCD cured for today, , I did look at F/T but need them quickly, but looking at the price I think I'll order a couple of 4 packs from them,

Mowjo,,,

[Get Off My Cloud]

Yep all the specs are identical, just to clarify better life is they're good for more charge cycles not that they last longer between charges.

[Q]

Cheapest option when I bought was to buy the pairs, I bought 5 pairs which worked out best

[Ali Bongo]

An observation on the Samsung 25r's. I couldn't get to grips with these batteries when I first bought a pair. In a single tube mech mod, with a really low ohm dripper on, I found them crap. But in a dual battery mech box mod with these batteries (at really low ohms) I found them Brilliant. I am using them in the Dimitri I take to work at the moment, with a dripper coiled at 0.1ohm, and they do the business. I get home from work, put them on my charger, and they are still three quarters charged.
Good batteries in my book. They cannot handle mega low ohms when used singular. But in pairs, they are excellent.

[Q]

10 of the green ones from FT work out at £28.74 (if you buy 5 lots of 2)

£2.87 per battery is pretty good

[decoy]

there is a new type of batt coming
when i say that what i mean is it works in a totally diff way to old batts and should never run out of life cycles
they can apparently be charged v quickly and have better mha to size
its something to do with atom thickness layers of 2 types of material built up and the electrons can move between it or sumut
still tomorrows world stuff but not to far off(within 5 years)
i think the only reason why they have put so much development in to batts now is electric cars wich is wear i gleamed this info from
any one for a 1000 watt mod

[Greg]

Sept 15, 2015 17:03:12 GMT Ali Bongo said:

An observation on the Samsung 25r's. I couldn't get to grips with these batteries when I first bought a pair. In a single tube mech mod, with a really low ohm dripper on, I found them crap. But in a dual battery mech box mod with these batteries (at really low ohms) I found them Brilliant. I am using them in the Dimitri I take to work at the moment, with a dripper coiled at 0.1ohm, and they do the business. I get home from work, put them on my charger, and they are still three quarters charged.
Good batteries in my book. They cannot handle mega low ohms when used singular. But in pairs, they are excellent.

That's not the batteries fault it's yours ! If you're using low ohms on a mech you should acquaint yourself with ohms law first for your own safety.

A fully charged batt in a mech with a 0.1 coil will draw circa 42 amps.

[Get Off My Cloud]

Sept 15, 2015 17:03:12 GMT Ali Bongo said:

An observation on the Samsung 25r's. I couldn't get to grips with these batteries when I first bought a pair. In a single tube mech mod, with a really low ohm dripper on, I found them crap. But in a dual battery mech box mod with these batteries (at really low ohms) I found them Brilliant. I am using them in the Dimitri I take to work at the moment, with a dripper coiled at 0.1ohm, and they do the business. I get home from work, put them on my charger, and they are still three quarters charged.
Good batteries in my book. They cannot handle mega low ohms when used singular. But in pairs, they are excellent.

The Dimitri uses parallel configuration for the batteries so you double your mAh but keep the same voltage output.
In a series box you would double your voltage but keep the same mAh.

[hijack]

Sept 15, 2015 11:57:59 GMT mowjo said:

 2x Green 30A Samsung 25R INR18650-25R 2500mAh 18650 3.7v Li-ion batteries +case
Mowjo,,,

I would stay well below the advertised 30A on the 25R's(really they are more a 15A with the ability to peak at 30A without dying on you).
Mainly because of the drop in voltage. I think the data sheet say's at 30A the average voltage achieved is 3.1ish volts.

[peter12]

Sept 15, 2015 17:03:12 GMT Ali Bongo said:

An observation on the Samsung 25r's. I couldn't get to grips with these batteries when I first bought a pair. In a single tube mech mod, with a really low ohm dripper on, I found them crap. But in a dual battery mech box mod with these batteries (at really low ohms) I found them Brilliant. I am using them in the Dimitri I take to work at the moment, with a dripper coiled at 0.1ohm, and they do the business. I get home from work, put them on my charger, and they are still three quarters charged.
Good batteries in my book. They cannot handle mega low ohms when used singular. But in pairs, they are excellent.

I see this also with the 25r. I have to go though 3 or 4 batteries a day. May have to get a dual mod. (Birthday soon)

[Ali Bongo]

Sept 16, 2015 6:43:57 GMT Greg said:

Sept 15, 2015 17:03:12 GMT Ali Bongo said:

An observation on the Samsung 25r's. I couldn't get to grips with these batteries when I first bought a pair. In a single tube mech mod, with a really low ohm dripper on, I found them crap. But in a dual battery mech box mod with these batteries (at really low ohms) I found them Brilliant. I am using them in the Dimitri I take to work at the moment, with a dripper coiled at 0.1ohm, and they do the business. I get home from work, put them on my charger, and they are still three quarters charged.
Good batteries in my book. They cannot handle mega low ohms when used singular. But in pairs, they are excellent.

That's not the batteries fault it's yours ! If you're using low ohms on a mech you should acquaint yourself with ohms law first for your own safety.

A fully charged batt in a mech with a 0.1 coil will draw circa 42 amps.

 

posted twice. sorry.

[Ali Bongo]

Sept 16, 2015 17:25:13 GMT Ali Bongo said:

Sept 16, 2015 6:43:57 GMT Greg said:

That's not the batteries fault it's yours ! If you're using low ohms on a mech you should acquaint yourself with ohms law first for your own safety.

A fully charged batt in a mech with a 0.1 coil will draw circa 42 amps.

I'm well acquainted with the ohms law. and battery safety. I've been doing it too long. The 25r's will p**s 42amp at a 3 second burst (pulse) and not even get warm.  After 3 bursts they get warm. So let them cool down. We are not talking continuous amps here. We are talking pulse. Good batteries will take more than their spec if used correctly. I have pulsed the Efest 2100mAh, 30amp ones at 0.03ohm. That's 140amp. (one pulse and wait a minute to let them cool down) Yes, they get warm, but do not vent. I know this might sound mad to some sub ohmers, but I have hammered batteries to test their capability and beyond. I am also an electrical engineer, so I know what I'm doing.