Upgrade to a 48V battery and simply connect a 12V lithium battery in series. Simply disconnect both and then reconnect them.
But it is better to buy a new one. If you really need it, you can only buy a 12V lithium battery with a protective plate. The capacity should be the same as 36V. Then charge them separately and use them together.
Lithium has very active chemical properties and is easy to burn. As the battery is charged and discharged, the temperature inside the battery continues to rise and the gas generated during the activation process expands, increasing the internal pressure. drums. When the pressure reaches a certain level, if the outer shell is damaged, it will burst, causing leakage, fire or even explosion. Therefore, be very careful about safety when using lithium batteriesum-ion.
Detailed information:
1. Precautions for lithium batteries:
< p>1. Avoid using it in harsh conditions, such as high temperature, high humidity, prolonged exposure to sunlight in summer, etc., and avoid putting the battery into fire.2. When removing the battery, make sure the electrical device is turned off; the operating temperature should be kept between -20 and 50℃.
3. Avoid “storing” batteries in electrical appliances that are out of use for a long period of time.
2. Storage of lithium batteries
1. Primary lithium batteries have a very low self-discharge and can be stored for 3 years. The effect will be better if stored in refrigerated conditions. It is a good idea to store primary lithium batteries in a low temperature location.
2. Lithium-ion batteries cancan be stored for more than six months at 20°C, because their self-discharge rate is very low and most of their capacity can be restored. Lithium batteries exhibit a self-discharge phenomenon. If the battery voltage remains below 3.6V for a long time, the battery will discharge excessively and damage the internal structure of the battery, thereby reducing its service life.
Therefore, lithium batteries stored for a long time need to be recharged every 3-6 months, that is, they should be charged at a voltage of 3.8 to 3.9 V (the best storage voltage for lithium batteries is around 3.85 V), and do not fully charge them.
3. Lithium batteries have a wide application temperature range. They can still be used outdoors during the northern winter, but their capacity will be greatly reduced if they return to room temperaturente.
Baidu Encyclopedia-Lithium-ion battery