I see they are for wireless landline phones, but do those use that much battery...? I would figure for an average person who still has a landline these batteries would just sit in there displaying the time on the phone for weeks, and then recharged, for someone who uses this wireless house phone then they would just recharge it every so often, maybe even daily, but even then you have more than two thousand charge cycles, that would be years... so what gives?
I think solar lamps more often than not use LiFePO4 these days, and cells like Eneloop Lite, low capacity high cycle, of which there are many brands and labels, are precisely and uniquely for wireless phones.
fulee9999 has misrepresented how most use these phones. They should use them that way, but no one does. No one talks on the phone anymore all the time, but even when they did, anyone that ever had a dead handset from depleted batteries, which is everyone that ever had a wireless phone, will keep them on their cradle religiously, only removing when in use. Many days they aren't even used, and when in use, most calls, nearly all in fact, last less than 5 minutes.
These cradles do not include a smart charger. They're dumb chargers, and while the best may stop charging when at capacity, as soon as the cell dips from self-discharge, the charger kicks in again. Many have endless trickle charge, some will not even have trickle charge in many cases, just endless charging, endlessly slamming the cells with 150 microamps. The cells in handsets probably receive the worst charge abuse of any cells in the history of batteries.
This is the answer to the mystery staring us right in the face, wireless phones. As of 2017, there were 455M landlines in the US, and undoubtedly there are still hundreds of millions. Anyone's call how many residential landlines use wireless phones, but they were always popular since the early 1980s. These low capacity, high cycle cells are those that can take the abuse of endless charging and infrequent short-term discharging, and yet still hold a charge for 20-30 minutes when in use, for up to even 5 years and even beyond before they can no longer hold a charge for even a few minutes.
If I am not mistaken, they used to be NiCad 300mAh AAA cells, which was a good fit for their ability to take abuse, even when overdischarged from self-discharge and left for months like that. NiMH more than tripled the capacity of NiCad for wireless phones, but probably won't survive as long when over-selfdischarged and left in storage for a long time. NiMH need to be used, and I've never had much success reviving high self-discharge NiMH after they sat overdischarged for a period beyond a couple months. Also, one can obviously use LSD NiMH in handsets, but due to how they are abused, they won't put out the necessary amps for very long.
