We're using cookies to serve you better - Read more

How to use and charge LiPo batteries


LiPo batteries overall

There are a couple of basic things to know about LiPo batteries before using them. It’s true that misusing a LiPo battery may cause burning/melting of the battery. When used correctly, LiPo batteries are rather safe to use and store. The benefits of using LiPo batteries in RC cars are undeniable, so careful and proper use of the batteries is necessary for safe and worry-free RC hobby. Lithium Polymer (LiPo) batteries are efficient and have a greater capacity than NiMH batteries, which is why they’re also more popular among hobbyists. In this article, we’ve decided to put together a list of things to know about LiPo batteries. The batteries are easy to use and there’s no reason to stress over using them.

LiPo batteries must be charged with chargers that are specifically meant for charging LiPo batteries. When you’ve got a new LiPo battery, check it’s polarity to avoid incorrect installation.  If the markings on the battery are not clear enough, you can check the polarity with a basic voltage meter. You can use a pen or paint to make the markings clearer. In batteries of known brands such as Gens Ace the markings are usually clear.

The most important thing about charging LiPo batteries is that you must never leave the battery unmonitored while it’s charging.  So if you’re about to go to the store while your battery is charging, charge the battery only when you’re back from the store.

If any issues occur during the charging, it may lead to the warming of the battery and in the worst case the battery might melt or explode.  This may be caused by the wrong charging program or incorrect parameters. This is why you should never charge a battery on anything that catches fire easily like paper or a tablecloth. It’s good to be prepared for this kind of things and buy a safety bag specifically meant for charging LiPo batteries. It protects both the battery and its environment during charging. While charging, the battery should be placed somewhere where it can be monitored and it should not be hidden in a closet, for example. 

Because monitoring LiPo batteries while they are charging is so important, we recommend the young hobbyists to get an RC car with a NiMH battery.  NiMH is a great and worry-free alternative when the car is not used frequently.

Charging Lipos

When charging a LiPo battery, first you choose a correct charging program. After this, you choose the number of cells to be charged (voltage) and make sure the maximum charge rate (A) is not exceeded. The maximum charge is the C value stated by the manufacturer in the manual.  A general rule is that batteries can be charged with the current corresponding to their capacity (1C). Let’s say your battery’s capacity is 4000 mAh. The marking 1C means that the battery can be charged with 4 Ampere current (value calculated directly from the battery’s capacity 1Cx4Ah=4A).

So when charging LiPo batteries, usually you only have to adjust to the charge current.  It’s recommended to always use balance charging. Balancing chargers ensure that all the cells are charged evenly and there are no differences in voltages between them. Balancing also makes sure that none of the cells are over-charged, as over-charging may have unwanted consequences. So make sure you are using a balancing charger with your LiPo batteries. In the pictures below, you can see an external balancing board and the integrated balancer in the charger to which the connector is connected according to the number of the cells.


In practice, the main power connectors (+ and -) and the balancing connector are connected to the charger. During runs you only connect the main power connectors (+ and -).

The LiPo battery is full when it’s reached the max voltage. The traditional LiPo cells (3.7v) max voltage is 4.2v and LiHv (High volt) 4.35v. This means that the voltage of a fully charged basic 2S LiPo (7.4v) is 8.4v and that of LiHV batteries is 8.7v. It’s good to note that the recommended charge voltage of the LiHV cells is 4,2v/cell, which is also the highest voltage allowed in races.  The maximum charge of a basic LiPo battery 4.2v / cell must not be exceeded.

In use, the cell voltage of a LiPo battery should not drop below 3v because it will damage the battery. Many RC cars have an integrated cut-off function, which will cut the power when the voltage is dropping too low. Before using LiPo batteries, check if your car has this function. 

When storing unused LiPo battery, it’s recommended to charge the battery to 50%. In a 2S battery this would mean a voltage of 7,6–7,7v (3,8–3,85/cell). Smart chargers have a Storage function that charges the battery to the voltage suitable for storing. You should also use a safety bag for storing your LiPo batteries and as a safety measure, store the batteries in an open space where you can see them. 

Despite their longevity, LiPo batteries wear out the same way as a full-size car battery for example. This is caused by the weakening chemistry of the battery. In the end, batteries are like any other consumable. By taking good care of and properly charging, you can easily increase the life span of your batteries.

So how do I recognize a malfunctioning battery?

The first sign of a damaged battery is puffing. Puffing may be caused by excess voltage or too high discharge rate. As LiPo batteries get old, it’s normal for them to puff a little in the middle. However, if the puffing is sudden you must get rid of the battery and not use it anymore. If the battery warms up above body temperature during charging, it’s a sign of decreased charging ability and the battery nearing the end of its life. In this case it’s good to check that the charging rate is correct.  LiPo batteries should be able to handle 1C charging rate without problems and without overheating.

However, in use it’s normal for the batteries to warm up. Especially in the more powerful cars it’s normal that the battery warms up to body temperature. If the battery feels clearly hot the current consumption of the car has exceeded the current output. If this is the case, you should consider switching to more efficient batteries (Higher C-rate).

When you follow instructions and use common sense, LiPo batteries are not dangerous, you just need to use them correctly. In use, they are definitely more efficient than NiMH batteries. For children and for infrequent use we recommend NiMH batteries because they are a worry-free alternative and endure a longer shelf life compared to LiPo batteries. If you’re concerned about something related to LiPo batteries or chargers, do not hesitate to ask us. We will gladly help you.

About us

RC Information

Order our weekly newsletter

Your shopping cart is empty

Terms and conditions

German
French
Spanish

All products listed as “in stock” are in our warehouse and ready to be shipped within the next day. Exceptions to this are pre-orders and possible, but unlikely, errors in stock numbers. All products include the Finnish VAT (24 %). Prices are subject to change without prior notice.

Customer service speed

We are answering emails everyday from the morning to the late evening, no matter if its Sunday or Christmas eve. We work in the EET time zone which is +2h from GMT. During the day our customer service is usually really fast and in the evening we are little slower due we have less people to answer questions. Easier things are usually handled within the hour and shipping related things we try to handle during the day so they can be shipped out the same day. Our goal is to answer all emails within 24h no matter how difficult the question is. The fastest way to get customer service is always to send us a email. Please include relevant pictures and a structured email with proper sentences so we can answer you faster. Take your time and read trough your email once before you send it to us.

Payment Methods and Shipment Information

We ship globally for example to Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden and United Kingdom, Norway, Turkey, Switzerland). And many other countries, just go to the checkout and see if you can checkout. If not just let us know and we will quote you a price as we are able to ship to any country in the world.

We accept Paypal, credit card payments, BitCoin and IBAN/BIC (SEPA) bank transfers.

Currency

All payments are made in Euros. You can however browse the shop in other currency but the price then is not final. You will see the final Euro price in your shopping basket when paying for the product. The price is shown in “5. Send Order” part of the checkout form.

VAT

Our shop automaticaly includes or excludes VAT 24% from the prices by the destination country. You can change the destination from top of the homepage and Checkout pages before you order.

Estimate Shipping times with GLS.

An international GLS parcel is delivered to neighbouring states of Finland like Sweden or the Baltic countries in a standard delivery time of 24 to 72 hours. To more distant European countries the international parcel dispatch takes between three and six working days, to remote areas up to eight days. Rough estimate is 1 week from order to delivery.
Note! Here you can find estimated delivery times.
Note! Here you can find collected statistics about average delivery times.

Estimated shipping times by DHL and UPS

DHL Express and UPS Express are our fastest delivery options. Both options can reach almost anyplace in EU in 1 day, but some places take 2 days.
• Depending what kind of products you want to order the shop will let you choose from available shipping options.
• Both Options are also Door To Door Services. The Courier will deliver the parcel to your door. But they also have pickup points where they might drop your package off so you can pick it up when it suits you.

When you are checking out your order you can see a more precise estimate of each shipping option to your country.

Refund policy

We accept returns of new, unused merchandise within 14 days from the delivery. Please contact us at [email protected] to receive return information. The customer is responsible for any return costs unless otherwise agreed to with our customer service. We try to return the money with the same payment method that was used to pay for the order, if its not possible we make a wiretransfer. You can also request a gift card if you are making a new order to speed up the process.

We also accept returns after 14 days upto 50days, but we refund them with a giftcard to our shop so you can replace them with any products we sell. Please contact our customer service for details.

After we receive the merchandise and verify its re-sellable condition, we will refund the money or give you a giftcard. Depending on the item this will take 1-3 days after we have received the item. If there is a delay we will contact you.
Note! Every return made without notice via email will be charged with handling fee of 20€. Handling fee will be reduced from the total refund.

Damaged Shipment

In the rare occurrence that the shipment has been damaged, please take pictures and send those to our customer service [email protected] immediately and we will make sure we get you sorted and back to enjoying our hobby. Also notify the courier bringing you the shipment that it has been damaged.

Defective parts

If you feel that your product is defective please send us a email and we will let you know what to do next. Most items do not have a warranty as they will break in normal usage. For example if you hit something solid or take a larger tumble. Properly used items should easily last 3-12 months and during this period we are able to replace broken items if they have a manufacturing or material fault. We have years of experience with different makes and they all have different warranty policies. We have chosen to work with brands that have a good understanding how to serve their customers and you can be assured that you will get the best customer experience possible with us.

We do not replace or exchange products that are not defective or broken by improper use or have not been maintained. But we do help and teach you how to do things properly so you do not break anything in the future, just email us and we will help you out. We are however unable to wrench for you, its part of the hobby so its important that you will learn that part also your self, we have great tools to sell you so just ask us what you need.

Don’t worry you are safe with us! Most of our customers feel that they get excellent service in the rare occurrence that they encounter a problem with the product they have bought.

And remember if you run in to a problem or you feel that there is a problem with arrived products do not hesitate to contact us. We are here to help and we do our best to sort it out as soon as possible.

What happens if EuroRC made a error in the shipment?

We ship a lot of orders each day and rarely there are errors. We do however try to minimize the effect on the customer. Please contact us immediately if we have made an error and we will make it right.

Address for returns

Always contact us before returning any product, we can not take responsibility for shipments that are sent without prior notice. Its very important that we can tell you how to mark the parcel so it will be processed in a timely fashion.

EuroRC Oy
Päiviöntie 8
12400 Tervakoski
Finland

[email protected]