Our phones which are over 10 years old had replaceable batteries and when one of them started draining too fast I decided to buy 4 batteries, to replace all multi-year batteries. To be fair I only replaced one at first but after 2 months it wasn't fully charged and was getting quite warm. So I can't rate the other 3, although I have 2 more installed now and will see what happens over the next few months or hopefully years. Another note: although the batteries are stamped Ni-MH (Nickel Metal Hydride), which is correct for this application, the box of 4 is marked "Li-Ion".
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