Mixing Batteries of the Same Chemistry

It is possible to mix batteries in a battery pack, provided they are the same battery chemistry and the total Ah for each group in series is consistent.

(i.e.  The sum of each group in series should be the same,  e.g. if one is 300Ah...  the others should add up to 300Ah too.)  

For people making packs of 18650 batteries programs like https://www.repackr.com/ can help you build your pack once you have checked the capacity.  

Note:-  That this can also be used to turn your WatchMonPlus 12s to 14s for a better 48V fit for your inverter.  

(e.g. Tesla with Leaf batteries provided total Ah of Leaf same as Tesla in your battery pack)