How to buy batteries for mobile phones
The first thing to focus on is weight, dimensions and price. NiCd is the largest and heaviest, about twice as thick and heavy as Li-ion. NiMH battery is significantly lighter and smaller than NiCd, but larger and heavier than Li-ion. The picture is similar for the price: as cheap as a NiCd battery is, Li-ion is just as expensive.
The second moment. When selling batteries, their service life is usually not advertised. If NiCd with proper operation can last for three years or more (even with daily charging), then NiMH with intensive use will last only for a year with a small one, and Li-ion for about one and a half - two. A NiMH battery will exhaust its resource by the number of charge/discharge cycles, and a Li-ion will simply age, even if the number of cycles possible for it will not be exhausted, and it will just sit on the shelf.
Long-term use of NiCd batteries requires increased attention to their maintenance. It is recommended to discharge them to the end before the next charge, and periodically, about once a month, carry out recovery cycles. The same requirements, albeit to a lesser extent, also apply to NiMH batteries (regenerative cycles are needed here twice as often). In this regard, Li-ion batteries are the undisputed leader: they do not require any special maintenance. They can be charged at any time of the day or night, without waiting for a full discharge.
The third. Try to buy batteries from the same manufacturer as your phone. Brand batteries, as a rule, also have brand quality. If you are offered batteries from another manufacturer, consult with those who have already dealt with them. Be sure to get the seller's consent to take the battery back if you are not satisfied with it for at least 2 weeks. Immediately after purchase, check the operating time of your phone with a new battery several times and compare it with the one specified in the user manual. Compare the obtained value with the time on the previous battery (take into account the difference in capacity). The best way to evaluate battery parameters is to test the purchased battery on an analyzer before or after purchase.
