QUOTE(gec @ Feb 4 2006, 21:13)
...Da bateriile dupa ce se produc, la fabricutza, se produc din materiale gata incarcate electric? Nu stiu!...
(IMG:
style_emoticons/default/smile.gif) Tocmai aici e ''șpilul''... Bateriile produc tensiune ca urmare a unei reacții chimice a materialelor componente iar încărcarea ar trebui să producă o reacție chimică complementară care să refacă componentele inițiale... (IMG:
style_emoticons/default/cool.gif)
Bateriile de 4.5V sunt clasice pe bază de zinc-carbon iar cele alcaline sunt diferite... probabil ca ideea cu pulsurile inverse merge la zinc-carbon, la alcaline merge fară, trebuie sa respecți curentul de încărcare - mai mic de 1/10 -1/20 din capacitatea echivalentă... și fiecare element trebuie încărcat separat și nu în serie ca la bateriile de 4.5V.
QUOTE
Rechargeable Alkalines (RA's) were designed to be the best of both worlds -- the high capacity of an alkaline, combined with the rechargeability of a NiCad. They're not.
RA's get far fewer recharge cycles than a real rechargeable (NiMH), and their capacity drops every time you charge them. After as few as eight cycles, an RA could have HALF the capacity of a new RA, according to chart on Energizer's and Accucell's websites (which they've since removed). In fact, RA's have lower starting capacity than the best NiMH's right from the get-go.
RA's also require a special recharger (not a standard recharger). And you can't use RA's in high-drain devices like digital cameras.
That said, there are exactly two cases in which RA's could be your best choice:
-You need the extra voltage an alkaline puts out. Some devices that take multiple batteries won't work with NiMH because the voltage is too low. (more on this problem) And with LED flashlights, even though NiMH will work, you'll get a brighter light with RA's.
-Your device is used infrequently (like a flashlight) and the high self-discharge rate of NiMH's means that the batteries go dead on their own between periods of use.
Why there aren't 9V rechargeable alkalines. From the Rayovac website: "There are two reasons: (1) 9V batteries actually have six small 1.5 V-cells inside them. Reusable alkalines need to be charged individually for reliable performance. Since you can't access each cell inside the 9V battery individually, they could not be reliably recharged.
Caut schema incarcator de baterie in comutatie, Schema se gaseste in revista Tehnium
4th February 2006, 13:56
