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Old 08-10-2010, 06:36 AM #1
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Default Charger full-charge voltage?

Both my chargers meter 4.2V, a rayfos and wicked laser. one is 600mAh, the other is 1A.

While charging my 2 Sohine 2800mAh batteries, The charge takes for ever. I pulled one off the charger, and it read "4.25V" on both chargers, yet, the light is still red. I know in the past My rayfoss turned off at 4.27V. But, is this normal? Shouldnt it stop at 4.2V because the chargers BOTH put 4.2V exact with no load? It just go past and i always fear this is bad and can cause damage. However, BOTH chargers are doing it. Whats the chance I got 2 chargers, that are bugged? What do your batteries meter when freshly off the green-indicator full charged?

Also, while im at it, whats a good charger that can charge pretty fast and guarantee 4.1-4.2V STOP?


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Old 08-10-2010, 03:29 PM #2
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Default Re: Charger full-charge voltage?

jbtm, from your other thread, I assume you are comparing the charge times of a 1300mAh cell to that of a 2600mAh cell. Logically it should take twice as long at least, since the cell holds twice as much.

4.25 is ok, but cutting it close, and usually after resting the cells drop back down to 4.2V.

If you notice the cell is at a voltage indicating full charge, it doesn't hurt to take 'em out early.

Lastly, if you have a DSD charger, replace it. I have a wf-139, and it does what it does... Charges newer cells higher than older ones, though, so sometimes I like to keep an eye on it. A lot of people swear by the Pila IBC. It's about $60, but people rave about it.
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Old 08-10-2010, 03:54 PM #3
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Default Re: Charger full-charge voltage?

I seen. Shall have to decide, it appears when I volt meter the battery during charge, I can see the voltage it's at. I will see if I'll get that $60 charger, or modify my WL 1A charger and install a custom voltage-watcher that will actually cut power at exactly 4.2V...

Thanks for your help!
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