Group 34-78DT Automotive Batteries

3D rendering of the BCI (Battery Council International) Group 34-78DT battery for cars and trucks.

Electrical Specifications:
12 Volts
465 - 800 Cold Cranking Amps (CCA)
100 - 115 Reserve Capacity Minutes
Left Positive Polarity

Mechanical Specifications:
Length: 10 1/4" (26.0 CM)
Width: 7 1/8" (18.0 CM)
Height: 7 5/16" (18.6 CM)
Body Style: Traditional with Flat Classical top
Terminals: Left Positive Left Positive Top Post STD/SAE and Left Positive Side Post
Flanges: Raised Hold Down Ledge

Electricals:

   We measure battery power with two numbers: Voltage and Capacity.  All 34-78DT batteries provide 12 Volts and strong international standards have made sure that everyone agrees on what Voltage means and how to measure it.  Capacity, however, varies between manufacturers and brands.  To complicate matters further, we measure automotive battery capacity in a variety of ways.
   Capacity measures the number of electrons a battery can provide.  In general, we measure battery capacity in amp hours, or watt hours, however, in automotive applications, we care more about how much electrical power a battery can supply instantaneously to start the engine.  We measure this instantaneous power in CA, Cranking Amps, and CCA, Cold Cranking Amps.  Batteries store chemical energy and release it through temperature sensitive chemical reactions.  In cold climates, we only care about CCA, because they report how much instantaneous power the battery can supply at zero degrees Fahrenheit.  When new, Group 34-78DT batteries must provide a minimum of 465 CCA and a maximum of 800 to meet standards but many manufacturers exceed the requirements.
   Modern vehicles increasingly rely on their batteries to power peripheral electrical features like sound and entertainment systems, navigation computers, USB ports, light bars, winches, inverters, communications devices, and countless other specialized electrical equipment.  We call these features deep cycle applications because they draw smaller amounts of power over longer time periods.  We measure deep cycle capacity in Amp Hours or Reserve Capacity Minutes.  To meet specifications, new group 34-78DT batteries must provide at least 100 Reserve Capacity Minutes and a maximum of 115 but many batteries exceed these capacity requirements.

Mechanicals:

   Group 34-78DT batteries have Traditional body shapes with overall dimensions of: 10 1/4" X 7 1/8" X 7 5/16" or 26.0 CM X 18.0 CM X 18.6 CM.  The 7 1/8" (18.0 CM) length includes the flanges.  The 7 5/16" (18.6 CM) height includes the Flat Classical top and the terminals plus any protruding acid caps, but not any raised lifting straps or handles.
   Vehicles can fasten group 34-78DT batteries with top mounted hold down straps/bars or by gripping any of its Raised Hold Down Ledge flanges, and connect electrically via leads fit for Left Positive Left Positive Top Post STD/SAE and Left Positive Side Post terminals.

Example Battery Images:

Group Size 34-78DT.  DieHard S39890  by Clarios 875 CCA Left-Positive polarity Double terminals.
34-78DT by Clarios.  
Marketed as DieHard
Part#: S39890.
Group Size 34-78DT.  Exide Marathon Unknown  by Exide Left-Positive polarity Double terminals.
34-78DT by Exide.  
Marketed as Exide Marathon
Part#: Unknown.
Group Size 34-78DT.  Super Start Premium  34-78PRMJ 721112800493 Made in Mexico  by Clarios 800 CCA 115 Min.  RC Left-Positive polarity Side-Post terminals.
34-78DT made in Mexico by Clarios.  
Marketed as Super Start Premium
Part#s: 34-78PRMJ 721112800493.
Group Size 34-78DT.  Super Start Premium  34-78PRMJ 721112800493 Made in Mexico  by Clarios 800 CCA 115 Min.  RC Left-Positive polarity Side-Post terminals.
34-78DT made in Mexico by Clarios.  
Marketed as Super Start Premium
Part#s: 34-78PRMJ 721112800493.
Group Size 34-78DT.  Unknown  by Clarios Left-Positive polarity Double terminals.
34-78DT by Clarios.  
Part#: Unknown.
More example images coming soon.  

Where to Buy:

https://goto.walmart.com/c/1934446/565706/9383?veh=aff&sourceid=imp_000011112222333344&u=https%3A%2F%2Fwww.walmart.com%2Fip%2FOPTIMA-YellowTop-AGM-Spiralcell-Dual-Purpose-Battery-Group-D34-78%2F55465196
https://goto.walmart.com/c/1934446/565706/9383?veh=aff&sourceid=imp_000011112222333344&u=https%3A%2F%2Fwww.walmart.com%2Fip%2FOPTIMA-RedTop-AGM-Spiralcell-Automotive-Battery-Group-34-78%2F55465192