Can nickel metal hydride batteries and lithium batteries be used together (in series)

It is best not to use it. Connecting batteries of different types together will shorten battery life and may also pose a hazard.

You can buy high-capacity nickel-metal hydride rechargeable batteries. Doesn't the Audi Double Diamond have a capacity of 1800mah? (There seems to be a larger capacity, I haven't driven AWD for a long time)

Slightly higher voltage will have no effect, but if it exceeds too much, the motor may be burnt

There is no problem to change lithium battery, but you can only buy lithium batteries with the same appearance as AA batteries. Make sure to buy one with a single battery capacity of 2000 mA or more, otherwise your battery will run out of power after a while.

You can only use 1.2V or 1.5V - digital cameras should use 1.2V, not 3.7V Haha, the low voltage is to increase the current strength. If the voltage is high, use the digital camera. . Burned,,

This explanation should be clearer:

1. If mutual versatility (depending on circuit design, different voltage ranges) is not considered, the same in capacity conditions, a 3.6V lithium battery has a total capacity greater than two 1.2V nickel-metal hydride batteries and can be replaced. For example, 3.6V 1000mAh can replace 1.2V 1000mAh*2. The first is 3.6 Wh and the second is 2.4 Wh.

2. If it is used in a circuit, it generally cannot be replaced. Because the operating voltage range of products using 3.6V lithium batteries is generally 3-4.2V, while products using lithium batteries2-cell nickel-metal hydride batteries of 1.2 V are generally 2 to 3 V.

In addition, with the development of lithium batteries, the rated voltage has been increased to 3.6 V. original at 3.7 V, and there are already 3.8 V batteries (4.35 V fully charged).