Did you fully charge your batteries before you started vaping?
The 2500mah is imren and the 3000mah is LG I think (it's plain brown)
Although both are 20A CDR cells, the LG HG2 is the better cell (if it is authentic).
Fake LG HG2's
Calculating Amp Draw
The resistance of your coil does not come into play when using a REGULATED mod. As long as the coils resistance falls within your mods specs, you are good to go. The power/wattage you vape at is what's important when using a REGULATED mod (as far as safety goes).
An authentic 20A CDR cell is safe to use up to 60 watts.
About Batteries
There are only a few battery manufacturers in the world who make their own "cells", including LG, Samsung, Sony, Panasonic & Sanyo.
All the other brands on the market buy the second and third tier cells from those manufacturers and re-wrap them under their own brand. These are "second and/or third tier cells" which did not meet the higher standards of the original manufacturer. In order to compete with the original manufacturers' batteries (first tier), these other companies feel obligated to publish specifications which are inflated to make them appear superior to those of the original manufacturer.
Do your research before you buy. Decide what battery to buy depending upon the application that you will use them.
@Mooch has done independent testing of many of the batteries available to use; look for the results for the top batteries you are interested in in his
blog.
BATTERIES - WHERE TO BUY
Only buy batteries from a reputable supplier (not ebay or Amazon) as there are many counterfeit batteries being sold. Here are several reputable battery suppliers in the US.
