Replacement rechargeable batteries for landline phone

Hello,

Absolutely, if the polarity -/+ and the voltage (V) are the same, the mAh (milliampere-hours) are just an indicator of current availability (like a reservoir), so no problem on that side.

Hi,

The answer is almost correct because it isn’t false, but two small important points must be clarified:

1/ Rechargeable batteries don’t exist as “piles”; the correct term is batteries. I know sellers often mislabel them, which misleads buyers, and I deplore that, because putting batteries in a battery charger (a phone has a built-in charger) can lead to overheating and fire.

2/ mAh milliampere-hours isn’t milliampere/hour, but milliampere × hours; it indicates the capacity (amount of energy) of a battery, for example it could provide 1 mA for 100 hours, so it is a unit of energy. For large batteries, such as car batteries, it’s also expressed in Wh. A mA/h, if it existed, would be a unit of power, like the Watt.

What this boils down to is that 800 mAh is therefore twice the capacity of 400, like a 4-seat car compared to a 2-seat one :-)

The most important thing is that the voltage (in volts) be identical and that the technology be NiMH, which only works with NiMH chargers.

PS, mh does not mean milli-hour, but metal hydroxide or something like that.

Et voili, voilou, voilà ....
But alas, how tedious the line breaks are!!

Putting 800 mA batteries in place of 400 mA ones is not such a good idea…

The charging circuit is designed for slow, permanent charging. Since the charging current is low (designed for 400 mA), the end of charge is not detected and the battery overheats.

The batteries intended for wireless devices have a lifespan of 2 to 3 years.

Some people modify the charger bases… but is it worth it…