CAPACITY & VOLTAGE
The important things to consider when looking at any batteries, whether NIMH or Lipo, are capacity (which determines how long your car or truck will run per charge) and voltage (which determines how much speed and power your model will deliver). Here’s what you need to know:
The big number on most battery labels (3300, 4000, 5000, etc.) indicates its capacity in milliamp hours, which is generally shortened to “mah.” The greater the mah number, the longer your car will run per charge (and conversely, the longer it will take to recharge the pack). “Bigger number = longer run time” is all you really need to know, but it’s helpful to understand what the mah rating actually means. If your battery is rated at 5000mah, that means it can hold a steady 5-amp load for a full hour. We get “5” from “5000” because a milliamp is 1/1000 of an amp. Divide the mah rating by 1000, and you get amp-hours: 5000 ÷ 1000 = 5. If you have a 6000mah battery, it can hold a 6-amp load for an hour. Or, if the load is 3 amps, that 6000mah will run for two hours. Greater capacity = longer run time.
The voltage of a battery pack is determined by how many cells it has. A single NIMH cell delivers 1.2 volts, and NIMH batteries are most commonly offered with six or seven cells. These may be referred to as “6-cell” and “7-cell” packs, or they may be referred to by their voltage: 7.2 volts and 8.4 volts (since 6 x 1.2 = 7.2, and 7 x 1.2 = 8.4). It’s different with Lipos.
The principle is the same, but since a single Lipo cell delivers 3.7 volts, Lipo packs have fewer cells for a given voltage. The most common configurations are 2-cell, 7.4-volt packs (2 x 3.7 = 7.4) and 3-cell, 11.1V packs. As with capacity, more volts is better—to a point. Your vehicle’s power system is designed to handle a certain amount of voltage, and exceeding that voltage will, at the very least, shut the system down if it has “overvoltage protection” or, at worst, fry the electronics. Always check your vehicle’s (or speed control’s) manual for the maximum voltage specification before upgrading to a pack with more volts.
This Dynamite Lipo’s capacity is 5000mah, and its voltage is 11.1 volts.