Of course the conspiracy theorists said the non-rechargeable battery companies were paying the gadget makers to do this deliberately, but the reality is that it's simply been the growing prevalence of low-dropout linear, and switch-mode, power supplies that allows gadgets to work down to much lower cell voltages. Back in the old days, though, when a lot of electronics gadgets weren't designed to operate to < 1.0 V, the gadget fitted with NiCad rechargeable batteries would malfunction &/or shut off prematurely, and gadget manufacturers would warn customers not to use them, and to use non-rechargeable carbon/alkaline cells. When this is the case, it doesn't matter that NiCad & NiMH rechargeable cells have that lower terminal voltage, they'll still deliver all their energy. Well designed electronics powered by AAA/AA/C/D cells should be designed to work down to well under 1.0 Volts, ideally down to about 0.8V to extract the most energy form the cell - any cell chemistry type. However, every battery chemistry has different characteristics including voltage across a discharge cycle and open-circuit voltage.Įach type of battery chemistry yields quite different characteristics, including terminal voltage.Īt the opposite extreme are Lithium cells in AA & AAA format, but Lithium-based batteries have a 3.x Volt terminal voltage - how do the manufacturers get a 3.x V lithium cell to output 1.5V? They put a tiny switch-mode voltage regulator in the cap! 1.2V was a round number close enough to the typical voltage of those three chemistries and thus became the voltage on the label. In conclusion, the 1.2V is only nominal voltage. Ni–Cd cells have a nominal cell potential of 1.2 volts (V).a Ni–Cd cell's terminal voltage only changes a little as it discharges.Ī fully charged cell supplies an average 1.25 V/cell during discharge, declining to about 1.0–1.1 V/cell.the starting voltage of a freshly charged AA NiMH cell in good condition is about 1.4 volts. The open-circuit voltage is 1.4 volts, dropping to 1.2 volts during discharge. So, excerpting the relevant sections of Wikipedia: It is quite normal for the charge capacity of rechargeable cordless phone batteries. With an 800mAh capacity, the battery will power your device for a long time. You can find variants ranging from the four-pack to the 16-pack. The AmazonBasics AAA Rechargeable Batteries come in several sizes, with each differing in price. According to Wikipedia, the following rechargeable battery chemistries have cell voltages of 1.2V:Īt a glance, it would appear that nickel is the common denominator, but this is not the case, as nickel-hydrogen and nickel-zinc have voltages of 1.5V and 1.7V, respectively. These rechargeable BT cordless phone batteries are NiMH 1.2V AAA 550mAh. Amazon’s offering is one of the best rechargeable AAA batteries available. Running the batteries right down once a month will help them last as long as possible.Not all rechargeable batteries have a nominal voltage of 1.2V it is specific to a few chemistries that happen to be popular. To get the best from your cordless phone batteries leave the handset off the base for a few hours at a time. Please also note that new rechargeable cordless phone batteries do not reach their full capacity until they have been in normal use for several days. When replacing these BT cordless telephone batteries please charge them for a minimum of 24 hours the very first time. It is quite acceptable to replace your AAA 1.2V batteries with a slightly different capacity, but we wouldn't recommend going much higher than those currently fitted in the phone. 550mAh is the capacity or the amount of charge the battery can hold. NiMH is the chemical make up of the battery - Nickel Metal Hydride. So if your BT phone had AAA NiMH 1.2V 550mAh rechargeable batteries in before then these are correct. The best advice to choose the correct batteries is to replace like with like. Once you notice this it is probably time to replace the batteries. It is quite normal for the charge capacity of rechargeable cordless phone batteries to reduce with time as they wear out, giving you less and less standby and talk time. These rechargeable BT cordless phone batteries are NiMH 1.2V AAA 550mAh. Pack of 2 replacement batteries for BT Cordless Telephones. Cable & Wireless Cordless Phone Batteries.Binatone Symphony Cordless Phone Batteries.Binatone Style Cordless Phone Batteries.Binatone Speakeasy Cordless Phone Batteries.Binatone Solas Cordless Phone Batteries.Binatone Pegasys Cordless Phone Batteries.Binatone Lifestyle Cordless Phone Batteries.Binatone Icarus Cordless Phone Batteries.Binatone Fusion Cordless Phone Batteries.Binatone Elite Cordless Phone Batteries.Binatone Easy Touch Cordless Phone Batteries.Binatone E-Series Cordless Phone Batteries. Binatone Concept Cordless Phone Batteries.Binatone Big Button Cordless Phone Batteries.Binatone BB Series Cordless Phone Batteries.
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