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Can lithium batteries and lead-acid batteries be used in parallel? Can lead-acid batteries be mixed in parallel with lithium batteries at the same voltage? The editor tells you that both series and parallel connections are not acceptable. Batteries with different capacities cannot be used in series or parallel, but they can be replaced and used under the same voltage state. The editor has compiled an article on whether lead-acid batteries and iron lithium batteries can be used in parallel for reference only.

Can lithium batteries and lead-acid batteries be used in parallel?

The editor will definitely answer you that lithium iron batteries and lead-acid batteries cannot be used in parallel for the following reasons:

1. Different discharge platforms

A single lithium battery has a voltage of 3.7V, while a single lead-acid battery has a voltage of 2 * 2=4V. (Lead acid batteries have a voltage of 2V per cell, and a battery can have 2-6 cells or even 8 cells, which is 4-16V). If they are combined, one type of battery will run out of electricity while the other has a lot of electricity left.

2. Different charging methods

Lead acid batteries are charged using a constant current and constant voltage method, while lithium batteries are charged using a constant current and then a constant voltage method. If the constant voltage is applied from the beginning, it will activate the protection function of the lithium battery management board, resulting in failure to charge, or if the charging current is too high, it will damage the battery life and the battery will not be used for 50 times.

What would happen if iron lithium batteries and lead-acid batteries with the same voltage were used in parallel?

Both lithium iron batteries and lead-acid batteries cannot be connected in series or parallel.

series connection:

1. Discharge: When discharging batteries with different capacities, there will always be one that is fully discharged first, while the other still has a higher voltage;

2. Battery dead: shortened lifespan by 80%, even damaged;

3. Charging: For batteries with different capacities, when charging, there will always be one that is fully charged first, while the other still has a lower voltage. At this time, the charger will continue to charge, and there is a risk of overcharging for batteries that are already fully charged;

4. Overcharging of batteries: will break the chemical equilibrium and cause water electrolysis, which will also damage the battery;

parallel connection:

Charging between batteries, when the voltage of a battery drops, the higher voltage battery will charge it, and the current size is not controlled. If this current is superimposed with the charging current from the generator, even in an instant, it will cause great damage to the battery. After a battery is damaged, the good battery will continue to charge it until its own power is exhausted.

In summary, lithium batteries and lead-acid batteries with different capacities cannot be used in series unless you intervene manually during the charging and discharging process, measure the battery voltage at any time, and dispose of it in a timely manner. The parallel use of batteries has strict conditions, requiring the same factory, model specifications, batch, and circuit connection, as well as the same usage environment. Otherwise, it is not recommended to use them.

What are the precautions for series and parallel connection of lithium batteries?

Do not mix different brands of lithium batteries, different capacities, or old and new lithium batteries together, choose batteries with consistent performance.

When the battery is low, replace all batteries. When using lithium batteries in series, the same type of battery should be used.

The general use of lithium batteries in series and parallel requires pairing of lithium battery cells. The pairing criteria are: voltage difference of lithium battery cells ≤ 10mV, internal resistance difference of lithium battery cells ≤ 5m Ω, and capacity difference of lithium battery cells ≤ 20mA.

Summary: Lithium batteries and lead-acid batteries cannot be used in parallel, but they can be replaced. For more questions, please feel free to consult our official website customer service. We are always at your service.

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