Different material cells, and diverse combined methods, will make variety voltage battery pack. In addition to the standard voltage of the cell, the NiMh,NiCd battery can be make up 2S (2.4V), 3S (3.6V), 4S (4.8V), 5S ( 6V), 6S(7.2V), 7S(8.4V), 8S(9.6V), 10S(12V), 12S(14.4V), 15S(18V), 20S(24V), 24S(28.8V), 30S( 36V), 40S (48V), 50S (60V).

Lithium ion batteries can be used as 2S (7.4V),  3S (11.1V),  4S (14.8V),  5S (18.5V),  6S (22.2V),  7S ( 25.9V),  8S(29.6V),  10S(37V),  13S(48V),  14S(51.8V/48V),  16S(59.2V/60V),  17S(62.9V/60V), 20S(74V),  23S (85.1V/84V),  26S(96.2V),  27S(99.9V),  30S(111V).

Lifepo4 batteries(lithium iron phosphate battery) can be used as 2S(6.4V),  3S(9.6V),  4S(12.8V),  8S( 25.6V),  12S(38.4V/36V),  16S(51.2V/48V),  20S(64V/60V),  24S(76.8V/72V),  28S(89.6V/84V),  32S(102.4V/96V) ,  36S (115.2V/110V),  40S (128V/120V).

LTO batteries can be used as 2S (4.8V),  5S (12V),  10S (24V),  15S (36V),  20S (48V),  25S ( 60V),  30S (72V),  35S (84V),  40S (96V),  45S (108V),  50S (120V).

Alkaline batteries can be used for 4.5V,  6V,  9V,  12V,  there are more available battery solutions, Alkaline batteries do very little other voltages.

ER lisocl2 batteries(Lithium thionyl chloride battery) can be used as 2S (7.2V),  3S (10.8V/9V),  4S (14.4V/12V),  5S (18V),  8S (28.8V),  10S (36V), etc.

CR limno2 batteries(Lithium-manganese dioxide battery)  can be make up 2S(6V),  3S(9V),  4S(12V) etc.