How to care for your rechargeable batteries is one of the questions I asked all the time. And it’s a great question, as new technologies have made rechargeable last longer and are easier to use. There are three main types of rechargeable batteries used in digital cameras: Nickel-cadmium (NiCad), nickel-metal hydride (NiMH) and lithium-ion (Li-on).
NiMH and Li-on both behave the same in a digital camera, so for the purposes of this article, we will treat them the same way. I will refer to them both as NiMH. You can also look for purchase 3000mAH+ lithium-ion batteries online at https://vapebatteries.net/.
NiCad this is what we have been using for years. This battery works fine but needs to be discarded almost nothing before you recharge them. That way they can take a full charge again. If you try to recharge them faster, 'memory effect' kicks in and the battery will not be charged the full rate.
NiCad is not able to take as much cost as a new kind of battery, so it will not last as long in digital cameras. Then came the NiMH battery. They work very well in digital cameras because they have been able to bring more power into each battery intact.
If you check the fine print, they make now to 2700 mah battery (milliamp hours), basically, a rank how long the battery will last (the higher the better mah). It is about twice the power NiCad owns. Another advantage of NiMH is charging. It wants to charge the battery.