Originally Posted by GSP
I am new to the Lipo batteries and I have a few questions.
1. How do you know which type to buy?
2. How do you know how may cells each pack has to make sure you have or are buying the corret charger?
3. When charging is there anything special you need to do?
4. How many times can you charge / use them in one day?
5. Is there a site I can go to to read and learn more about Lipo packs?
Thanks for you help with this.
1. Personally, I would choose a LiPo battery that has been tested and equipped for use in R/C cars. This means that you should choose a battery with a hard case from an R/C car motor/battery manufacturer. Some batteries fit specific vehicle and types so it is good to verify that the battery will work in your particular car. A 20C 3200 mAh battery will provide 64A continuous which should be enough for most applications. A lower C rating and/or lower capacity is not recommended. Any 1/10 competition car will use a 2-cell 7.4V battery (although they can use more) and 1/18 scale cars will use 7.4V or 11.1V.
2. You will need to use the manufacturer's specs to determine the number of cells and/or the nominal voltage. The nominal voltage of a LiPo cell is 3.7V. So usinn this you can determine the number of cells if it is not given. A 7.4V battery is 2-cell (2S), am 11.1V is 3-cell (3S) and a 14.8V is 4-cell (4S). Unless you really are knowledgeable, I would not try to determine the actual cell quantity (for charging purposes) if you are unsure or it in not marked.
3. No. You just need to be sure you are using a charger specifically designed for LiPo batteries set to charge the the correct number of cells and capacity. And if you are using a charger than can do both NiMH and LiPo, the charger must be in the LiPo mode or you will destroy your battery and possibly cause property damage or personal injury.
4. The battery can be used many times per day. The only requirement is that the battery be allowed to cool completely before recharging.
5. I am unaware of any specific sites, but R/C Tech contains many threads dediciated to LiPo batteries. You should be able to find good info throughout this site. Also check manufacturer's websites for product specific information.