Can You Mix Batteries With Different Ah. Uncertain about what to buy. You can wire two batteries in parallel if they have different amp hour ratings deep cycle or regular.
As well do not mix different battery brands within a device. Battery systems need to be installed all at the same time with all the components being the same. When you wire batteries together in parallel you are essentially just making each battery a cell of a larger unit.
Do not mix batteries with different chemistry alkaline lithium-ion etc.
15V Alkaline 13V NiMH and 12V NiCads are cells. Doing so will reduce overall performance and may also cause battery leakage or rupture. In parallel you should use diodes to connect the batteries to the UPS. If you must you can but be gentle with them and expect shorter charge life and shorter battery life.
