it is also possible they are running higher capacity cells on the 6amp
if you search ebay for 18650 cells you can find them in 1.5amp,2amp 2.5amp and 3amp variety's traditionally in the older packs that i have taken apart a 2amp pack will have 1 row of 2amp cells. a 4amp pack will have 2 rows of 2amp 18650 cells, a 5 amp will have 2 rows of 2.5 cells. and i custom rebuilt a 4amp pack with 2 rows of 3amp cells making it a 6 amp pack in a 4 amp pack housing.
if you search ebay for 18650 cells you can find them in 1.5amp,2amp 2.5amp and 3amp variety's traditionally in the older packs that i have taken apart a 2amp pack will have 1 row of 2amp cells. a 4amp pack will have 2 rows of 2amp 18650 cells, a 5 amp will have 2 rows of 2.5 cells. and i custom rebuilt a 4amp pack with 2 rows of 3amp cells making it a 6 amp pack in a 4 amp pack housing.
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