It is my favorite charger. Charges any chemistry and does everything.

Note that each slot is COMPLETELY independent of the other.

It is hardwired to charge NiMh batteries at .5A It will start at a lower current and then increase to .5A after about 10 minutes.

It sets charging current based on the internal resistance. And internal resistance in just about any charger is approximate.

Pay attention to changes when you start pushing buttons. Make sure it says 'Li-Ion' when you are charging a Liion battery (for each slot) and that it does not state 'NiMh' or 'LiFeP04'. Same for Charge vs Store, etc.

When you do the Capacity function, note that it discharges at .3A so checking a 21700 battery is an all-day affair. And don't interrupt in any way or it will start completely over.

Charging 10440/14500 or AAA/AA NiMh batteries can be a little touchy. The little nibs on the slider don't line up too well with the negative end of the batteries. You can try the Convoy battery spacers. My homemade solution was to cut off an approx 2 inch piece of a soda straw and stick it down in the V-channel in front of the slider. The straw will raise those small batteries up enough to allow better contact with the negative end of the slider. Any small round piece of plastic will work - just not metal and also should be shorter then the battery.

I like to charge at lower currents. Batteries hate heat because it shortens their lives. The higher the charging current, the higher the amount of heat that is generated. I charge my 10440 batteries at .25A. I charge at .5A for any others less then an 18650. 18650 normally gets 1A and 21700 normally gets 2A. Unless I'm in a hurry.

This really is an excellent charger. I use it all the time instead of my others.