Thunderchild

hm would be nice to see some li AAs like you say NIMH do discharge fast perhaps some of the batteries I thought were bad are not so bad...

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audioguru

Energizer make lithium non-rechargeable 9V, AAA and AA cells that outlast alkaline cells.

Ordinary Ni-MH cells have a higher voltage at the end of a discharge than alkaline cells.

New Ni-MH rechargeable cells come pre-charged and have much less self-discharge than before. But their capacity is less.

Lithium-ion and lithium-polymer batteries are extremely dangerous because they catch on fire if over-discharged or over-charged.

Attached Images

	AAA alkaline-lithium.PNG (21.6 KB, 6 views)
	AAA Alkaline-Ni-MH comparison.PNG (11.9 KB, 6 views)

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Hero999

I've seen 1.5V lithium cells before and I've always wondered how they do it, I always thought lithium cells were 3V.

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audioguru

I don't know how Energizer makes a 3V lithium disposeable battery produce only 1.5V.
They have a current-limiter circuit inside to prevent a nasty fire if they are shorted.

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RODALCO

I'm always suprised at those claims but facts are NEVER given.
And price is usually astronomical !!

I like to know Ah capacity and discharge rate under certain load conditions.

For the 1.2 V versus 1.5 V batteries for portable appliances.

Manufacturers could make 5 slot compartments with one dummy cell in it.
e.g. for 6 Volts, use 4 normal 1.5V cells with the dummy in series.
For Nicad etc fit 5 cells.

Ok it adds to extra cost, space etc. just my $0.02 worth.

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audioguru

Hi Rodalco,
You forgot to see my curves of battery voltages.
The voltage from a 1.2V Ni-MH cell is higher than the voltage from a 1.5V alkaline cell for most of the time. They both have the same capacity to 0.8V but when the Ni-MH cell is still at 1.2V the alkaline cell has dropped to 0.9V.

Go to www.energizer.com and look at their detailed datasheets for all their batteries. They show Ah capacity and discharge rate under many different load conditions.

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Hero999

In practice NiMH cells don't drop as quickly alkalines (see the graph posted by audioguru) to the lower initial voltage isn't a problem.

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RODALCO

Thanks audioguru, I missed those graphs.

Regards, Raymond

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mneary

What do you mean by 'facts'? Data sheets? Discharge curves? Just go to any manufacturer's (e.g. Energizer, Duracell, Sanyo) web site and click on technical info or engineering guide; they all have fairly detailed pdf data sheets.

audioguru

Energizer's datasheets reveal that their more expensive "Titanium" alkaline battery cells have exactly the same spec's as their less expensive ones.

Their C and D Ni-MH cells have a little AA cell inside.

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wmmullaney

One day when I was at the store they had NIMHs in the clearance bin, the upc was messed up, I got 4 packs of 4 for 99 cent each, (Later found out they were 14.99 )

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