What is your opinion of this 9 volt 900maH li-ion battery?

[Bill Bowden]

http://www.ebay.com/itm/Etinesan-Big-capacity-900mAh-9v-li-ion-lithium-Rechargeable-9-Volt-Battery-/390967934161?pt=LH_DefaultDomain_0&hash=item5b07813cd1

Claims the nominal voltage is 8.4 and it's good for 1200 cycles. Made in
China by Etinesan. Priced at $9.59 with free shipping. Sounds like a deal to
me.





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Bill Bowden <bperryb@bowdenshobbycircuits.info> wrote:

http://www.ebay.com/itm/Etinesan-Big-capacity-900mAh-9v-li-ion-lithium-Rechargeable-9-Volt-Battery-/390967934161?pt=LH_DefaultDomain_0&hash=item5b07813cd1

Claims the nominal voltage is 8.4 and it's good for 1200 cycles. Made
in China by Etinesan.

Tenergy has a 9 V 350 mAh Li-ion battery that seems to sell for about
$4 to $6: http://www.tenergy.com/30593

Unless the Etinesan one is some other chemistry, I would be suspicious
of the 900 mAh claim.

If I follow my standard rechargeable battery derating formula of
"salesman number * 0.25 = actual performance", the Etinesan cell would
be about 225 mAh, which seems closer to reality for Li-ion.

Matt Roberds

 

[Bill Bowden]

<mroberds@att.net> wrote in message news:mic9h6$a3b$1@dont-email.me...

Bill Bowden <bperryb@bowdenshobbycircuits.info> wrote:
http://www.ebay.com/itm/Etinesan-Big-capacity-900mAh-9v-li-ion-lithium-Rechargeable-9-Volt-Battery-/390967934161?pt=LH_DefaultDomain_0&hash=item5b07813cd1

Claims the nominal voltage is 8.4 and it's good for 1200 cycles. Made
in China by Etinesan.

Tenergy has a 9 V 350 mAh Li-ion battery that seems to sell for about
$4 to $6: http://www.tenergy.com/30593

Unless the Etinesan one is some other chemistry, I would be suspicious
of the 900 mAh claim.

If I follow my standard rechargeable battery derating formula of
"salesman number * 0.25 = actual performance", the Etinesan cell would
be about 225 mAh, which seems closer to reality for Li-ion.

Matt Roberds

I found a small used Li-ion, very thin cell-phone type (3.7 volt) that
weighs about half as much as a 9 volt alkaline, and measures about 800 mAh..
But it's only half the voltage. It seems possible to cram 2 of these into a
9 volt package and end up with same weight as the 9 volt unit with the same
800 mAh capacity. I guess I'll have to buy one to find out. I just hate
spending $10 to find out it's over-rated.




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[Charlie+]

On Tue, 5 May 2015 20:31:34 -0700, "Bill Bowden"
<bperryb@bowdenshobbycircuits.info> wrote as underneath :

http://www.ebay.com/itm/Etinesan-Big-capacity-900mAh-9v-li-ion-lithium-Rechargeable-9-Volt-Battery-/390967934161?pt=LH_DefaultDomain_0&hash=item5b07813cd1

Claims the nominal voltage is 8.4 and it's good for 1200 cycles. Made in
China by Etinesan. Priced at $9.59 with free shipping. Sounds like a deal to
me.

The nominal of a 2 series cell Li-ion battery would be 3.7*2=7.4v
The 8.4 comes from the maximum allowable charged cell voltage 4.20*2.
I wouldnt call this a 9v battery at all, it would never even reach 9v
without shortening the life of the cells!
C+

 

[Charlie+]

On Tue, 26 May 2015 08:38:32 +0100, Charlie+ <charlie@xxx.net> wrote as
underneath :

On Tue, 5 May 2015 20:31:34 -0700, "Bill Bowden"
bperryb@bowdenshobbycircuits.info> wrote as underneath :


http://www.ebay.com/itm/Etinesan-Big-capacity-900mAh-9v-li-ion-lithium-Rechargeable-9-Volt-Battery-/390967934161?pt=LH_DefaultDomain_0&hash=item5b07813cd1

Claims the nominal voltage is 8.4 and it's good for 1200 cycles. Made in
China by Etinesan. Priced at $9.59 with free shipping. Sounds like a deal to
me.

The nominal of a 2 series cell Li-ion battery would be 3.7*2=7.4v
The 8.4 comes from the maximum allowable charged cell voltage 4.20*2.
I wouldnt call this a 9v battery at all, it would never even reach 9v
without shortening the life of the cells!
C+

Also it would be physically impossible to pack a Li-ion cell of 900mAh
capacity into 50% of a PP3 Battery! C+

 

[o pere o]

On 05/06/2015 05:31 AM, Bill Bowden wrote:

http://www.ebay.com/itm/Etinesan-Big-capacity-900mAh-9v-li-ion-lithium-Rechargeable-9-Volt-Battery-/390967934161?pt=LH_DefaultDomain_0&hash=item5b07813cd1

Claims the nominal voltage is 8.4 and it's good for 1200 cycles. Made in
China by Etinesan. Priced at $9.59 with free shipping. Sounds like a deal to
me.





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My bet is that this is NiMH inside. 8.4=7*1.2, the nominal NiMH voltage...

Pere

 

On Tuesday, May 5, 2015 at 8:31:37 PM UTC-7, Bill Bowden wrote:

http://www.ebay.com/itm/Etinesan-Big-capacity-900mAh-9v-li-ion-lithium-Rechargeable-9-Volt-Battery-/390967934161?pt=LH_DefaultDomain_0&hash=item5b07813cd1

Claims the nominal voltage is 8.4 and it's good for 1200 cycles. Made in
China by Etinesan. Priced at $9.59 with free shipping. Sounds like a deal to
me.





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Check the negative feedback for the seller for the past 6 months. It appears someone bought the same battery you are considering, and was not happy.

Michael