- Ryobi 40v batteries containing ten 18650 cells in series (10S1P)
OP4015 contains 1.5Ah cells. 1C rate = 1.5Ah/1hr = 1.5A. 6.15A > 1.5A
OP4020 contains 2.0Ah cells. 6.15A > 2.0A
- Ryobi 40v batteries containing twenty 18650 cells are arranged in two string of ten cells in series (10S2P)
Cell capacity is half that of the battery pack, since the design is two cells in parallel.
Each string of ten cells receives half the charge current, or 6.15/2 = 3.08A.
OP4026 is rated 2.6A, so the cells are 1.3Ah. 3.08A > 1.3A
OP40261 is rated 2.6A, so the cells are 1.3Ah. 3.08A > 1.3A
OP4030 is rated 3.0A, so the cells are 1.5Ah. 3.08A > 1.5A
OP40401 is rated 4.0A, so the cells are 2.0Ah. 3.08A > 2.0A
OP40501 is rated 5.0A, so the cells are 2.5Ah. 3.08A > 2.5A
OP40601 is rated 6.0A, so the cells are 3.0Ah. 3.08A > 3.0A
- Ryobi 40v batteries containing thirty 18650 cells are arranged in three string of ten cells in series (10S3P)
Cell capacity is one third that of the battery pack, since the design is three cells in parallel.
Each string of ten cells receives one third the charge current, or 6.15/3 = 2.05A.
OP40602 is rated 6.0A, so the cells are 2.0Ah. 2.05A > 2.0A
OP40751 is rated 7.5A, so the cells are 2.5Ah. 2.05A < 2.5A
As can be seen above, the charge rate of the OP406A charger exceeds the 1C rate for all Ryobi 40v batteries except for the 7.5A OP40751.
OK, so the charge current of the OP406A just barely exceeds the 1C charge rate for the 6Ah OP40601/OP40602 (103% of 1C rate).
This is probably OK.