It would appear there is a Makita tester for the CXT range of batteries, a BTC06. I found it somewhat difficult to get information about, but this is the translated text from a Dutch site:
"Using the battery tester, the condition of a CXT battery can be read within 5 seconds. This way you can see whether the battery is in perfect condition or why it is not. It is possible to read the following things: voltage of the entire battery, voltage of a cell, remaining battery capacity, error message readout function and temperature of the battery/cells. Power supply via 4 AA (LR6) batteries or USB adapter DEBAD05 in combination with Makita battery. The following CXT Li-ion batteries can be tested: BL1015, BL1016, BL1020B, BL1021B, BL1040B, BL1041B"
No mention of number of cycles, so it's unclear whether the battery records that detail or not.
The CXT battery appears to have 5 pins, at this stage I've not found any data on what they each do, nor decent photographs of the board. What I have been able to establish is that there are at least two different board types, and at least two different cell types (18650 and 21700). The 21700 cell type appears to have quite a different board from the others.
It would appear there is a Makita tester for the CXT range of batteries, a BTC06. I found it somewhat difficult to get information about, but this is the translated text from a Dutch site:
"Using the battery tester, the condition of a CXT battery can be read within 5 seconds. This way you can see whether the battery is in perfect condition or why it is not. It is possible to read the following things: voltage of the entire battery, voltage of a cell, remaining battery capacity, error message readout function and temperature of the battery/cells. Power supply via 4 AA (LR6) batteries or USB adapter DEBAD05 in combination with Makita battery. The following CXT Li-ion batteries can be tested: BL1015, BL1016, BL1020B, BL1021B, BL1040B, BL1041B"
No mention of number of cycles, so it's unclear whether the battery records that detail or not.
The CXT battery appears to have 5 pins, at this stage I've not found any data on what they each do, nor decent photographs of the board. What I have been able to establish is that there are at least two different board types, and at least two different cell types (18650 and 21700). The 21700 cell type appears to have quite a different board from the others.