Battery Charging Time Calculator

Battery Charging Time Calculator is tool to help you out with calculating time you have to leave your battery to fully charged.

Lead Acid – LiFePo4 – Lipo – Li-Ion Battery Time Calculator

Charge Time:

Battery Charging Time Calculator Formula

mAh (battery Capacity)/Ah (Charge Ampere)

Charging Time (Hours)=Charging Current (A)Battery Capacity (Ah)​

Charging Time (Hours) = Battery Capacity (Ah) / Charging Current (A)

Example:- 100ah/10Amp = 10 Hour

If you also use any type of battery in your home, then this tool can prove to be very beneficial for you. Usually at home you have to charge your inverter, bike or car etc. but you do not know how much time you have to leave these batteries for charging. This calculator tool will help you find out the time it takes to charge lead acid batteries, lithium phosphate batteries and lithium ion batteries in your home.
In today’s time, the use of lead acid batteries is decreasing and lithium phosphate batteries are being used in things like inverters and these get charged much faster than lead acid batteries, due to which you can use them easily and quickly. While a lead acid battery takes up to 10 hours to be fully charged, a lithium phosphate and lithium ion battery can be charged in as little as around 3 hours.

How quickly a battery can be charged depends on its chemistry, that is, the charging cycle of the battery depends on the type of metals used in it. To charge a 150 A battery, which is a lead acid battery, the current given is between 10 amps to 20 amps, whereas a lithium phosphate battery can be charged up to 50 amps. Lithium batteries come with different duty cycles according to which you can charge them.

Note: Charge cycle of each battery is not the same, so you should charge the battery as per its datasheet.

Types of 12 Volt Batteries in the Market

There are three main types of 12V batteries commonly available:

  1. Lead-Acid Batteries
    These are the most widely used and are available in three subtypes:
    • Flooded (Wet Cell)
    • AGM (Absorbent Glass Mat)
    • Gel Cell
    All three types charge differently, and each has its own characteristics and applications.

Flooded Lead-Acid Battery Types

Flooded batteries further come in two main categories:

  1. Normal Flooded Battery
  2. Solar Flooded Battery

Key Differences Between Normal and Solar Flooded Batteries:

  • Charging Current:
    • Normal battery typically charges at 10A.
    • Solar battery is designed to handle higher current and can charge at 20A or more.
  • Charging Time (for 150Ah battery):
    • Normal battery: Around 10 hours to fully charge.
    • Solar battery: Can be fully charged in about 5 hours due to higher charge acceptance.

Charging Stages of Lead-Acid Batteries with Solar Charge Controller

When connected to a solar charge controller, lead-acid batteries follow a 3-stage charging process:

  1. Bulk Charging
    • Maximum current is supplied until the battery voltage reaches the set limit.
  2. Absorption Charging
    • Voltage is maintained while the current slowly reduces, allowing the battery to reach full capacity.
  3. Float Charging
    • Maintains a constant voltage to prevent overcharging and keep the battery at 100% without losing charge.

Lithium-Ion 12V Batteries

  • Charging Capacity:
    Lithium-ion batteries have the highest charge acceptance rate among all 12V battery types.
  • Efficiency & Speed:
    They can charge much faster compared to lead-acid batteries and are highly efficient with minimal energy loss.
  • Charging Control:
    Require a Battery Management System (BMS) to safely manage charge and discharge cycles.