No, custom-made lithium-ion battery packs are not dangerous. They are eco-friendly. They are safe than other battery packs. Because at present time, it reduces the emitting carbon-di-oxide from diesel or fuel controlled cars. These vehicles are using custom-made lithium-ion battery packs for operating purposes which is more reliable. The most important thing is you don’t need any experience to use this battery packs cause it is rechargeable and automatically charges when it’s needed. Do you know that Li-ion batteries are one of the safest options to explore when it comes to various types of batteries in the market? They are so safe that anyone can make use of them without experiencing any complication. For instance, they charge automatically without any problem. As a user, you do not require any special knowledge or skill to use these batteries. If you are using one in your home at the moment, you will notice that the charging process is straightforward and simple. It is similar to plug and play. Lead-acid batteries are different in such regards. They are not safe and can prove to be very dangerous while being used. As a matter of fact, it is recommended that you have some special skills while making use of them. Lithium-ion batteries, on the other hand, have been designed to be used by anyone without any fear. This is because they have protective components to ensure you do not come in physical contact with those dangerous parts or items.