![]() ![]() ![]() Once you tell us that, we can tell you (or you can calculate) how many 4-series battery packs NEEDS TO RUN CONTINUOUSLY WITHOUT POWERING DOWN. If 11.1v is unacceptable then you have to round up to FOUR 3.7V batteries to get 14.8VĮven if you use 4 batteries IN SERIES, you STILL need to tell us HOW LONG THIS APPLICATION How many batteries do you need in SERIES ? Then you calculate how many of those SERIES battery packs you need to get the operation timeĪpplication requires FOUR batteries IN SERIES to get 14.8V (3 batteries is only 11.1V)Īpplication requires FOUR SERIES 18650 battery packs (of FOUR batteries) in PARALLEL). Typically you calculate the number of batteries to get the voltage you need. Minimum current capability at any given time = 870mA (0.870A)ĭoes it matter which you calculate first ? In other words, what is the application mAh spec ?Ī- WHAT IS THE APPLICATION CURRENT REQUIREMENT ?ī- HOW LONG DOES YOUR APPLICATION NEED TO RUN AT ONE SESSION WITHOUT STOPPING TOĪpplication contains the following devices:Īpplication needs to run 12 hours without powering down for a battery change.ġ0440/3400= 3.07 batteries =>either round up to 4 or reduce time to 11 hrs, 43min. ![]() What's the load and the the minimum operating You still haven't answered the questions : Why people use parallel batteries to increase voltage but keeping the capacity the same while if they connect in parallel it will increase the capacity of the charge and to get higher voltage use step up circuit in parallel the voltage is increased but capacity will be equal to whatever a single 18650 assuming all 18650 are of same brand with same capacity. The question is what are the disadvantages of this approach. If i need 12Vs from 18650 power bank then i will connect four 3.7V cells in series to get 14.8V and to increase capacity i will have 3 or series arrange in for example 4s3p bankīut what if i connect all 18650 in parallel which will increase the capacity of the power bank but voltage will be 3.7 and to get 12 volts i will use step up circuit to make it 12v ![]()
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