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Dell M1210 battery choices - NF343
Son just picked up a refurb Dell M1210 and likes it a lot compared to our
Dell C610's.. It came with the Dell battery - NF343 - 11.1v 53Wh wondering where to go get the bigger brother, as backup, and the model number compared to the NF343 -- ---------------------------------- "If everything seems to be going well, you have obviously overlooked something." - Steven Wright |
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Dell M1210 battery choices - NF343
"ps56k" wrote in message ... Son just picked up a refurb Dell M1210 and likes it a lot compared to our Dell C610's.. It came with the Dell battery - NF343 - 11.1v 53Wh wondering where to go get the bigger brother, as backup, and the model number compared to the NF343 -- it's interesting how battery specs are tweaked to show more power.... even Dell - ie - Dell CG039 battery lists as 9cell @ 85Wh the "key" is what is used as a base voltage - 10.8 vs 11.1- which is interesting as most all rechargeables list as 1.2v 9 x 1.20v = 10.80v 9 x 1.24v = 11.07v 11.1v x 4800mah = 53Wh (NF343) 11.1v x 7600mah = 85Wh (CG039) Other battery vendors - 10.8v x 6600mah = 71Wh 10.8v x 7200mah = 77Wh |
#3
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Dell M1210 battery choices - NF343
"ps56k" wrote in message ... Son just picked up a refurb Dell M1210 and likes it a lot compared to our Dell C610's.. It came with the Dell battery - NF343 - 11.1v 53Wh wondering where to go get the bigger brother, as backup, and the model number compared to the NF343 -- ---------------------------------- "If everything seems to be going well, you have obviously overlooked something." - Steven Wright Pacific battery doesn't stock it - yet. http://www.pacificbattery.com/dell_x...0_battery.html |
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Dell M1210 battery choices - NF343
On Tue, 17 Mar 2009 09:58:17 -0500, "ps56k"
wrote: it's interesting how battery specs are tweaked to show more power.... even Dell - ie - Dell CG039 battery lists as 9cell @ 85Wh the "key" is what is used as a base voltage - 10.8 vs 11.1- which is interesting as most all rechargeables list as 1.2v 9 x 1.20v = 10.80v 9 x 1.24v = 11.07v 11.1v x 4800mah = 53Wh (NF343) 11.1v x 7600mah = 85Wh (CG039) Other battery vendors - 10.8v x 6600mah = 71Wh 10.8v x 7200mah = 77Wh It isn't 9 cells @ 1.2V. It is 3*3 at 3.6V, or in the other case 3.7V. The quoted nominal cell voltage of Li-Ion cells depends on who wants to impress whom as much as any clinical arguments. Using a charge termination voltage of 4v20 (the notation I prefer) and an end-of-discharge voltage of 3v0, the average is 3v6. Under constant current discharge the voltage curve is reasonably linear so using the average is a reasonable approach. However under constant power discharge the curve becomes steeper as the voltage drops, so 3v7 is more relevant in some arguments. |
#5
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Dell M1210 battery choices - NF343
"rebel" wrote in message ... On Tue, 17 Mar 2009 09:58:17 -0500, "ps56k" wrote: it's interesting how battery specs are tweaked to show more power.... even Dell - ie - Dell CG039 battery lists as 9cell @ 85Wh the "key" is what is used as a base voltage - 10.8 vs 11.1- which is interesting as most all rechargeables list as 1.2v 9 x 1.20v = 10.80v 9 x 1.24v = 11.07v 11.1v x 4800mah = 53Wh (NF343) 11.1v x 7600mah = 85Wh (CG039) Other battery vendors - 10.8v x 6600mah = 71Wh 10.8v x 7200mah = 77Wh It isn't 9 cells @ 1.2V. It is 3*3 at 3.6V, or in the other case 3.7V. The quoted nominal cell voltage of Li-Ion cells depends on who wants to impress whom as much as any clinical arguments. Using a charge termination voltage of 4v20 (the notation I prefer) and an end-of-discharge voltage of 3v0, the average is 3v6. Under constant current discharge the voltage curve is reasonably linear so using the average is a reasonable approach. However under constant power discharge the curve becomes steeper as the voltage drops, so 3v7 is more relevant in some arguments. huh - math is the same 9 x 1.2v = 10.8v 3 x 1.2v = 3.6v x 3 = 10.8v the real question(able) issue, is using something other than 1.2v per cell. |
#6
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Dell M1210 battery choices - NF343
On Tue, 17 Mar 2009 20:34:29 -0500, "ps56k"
wrote: "rebel" wrote in message .. . On Tue, 17 Mar 2009 09:58:17 -0500, "ps56k" wrote: it's interesting how battery specs are tweaked to show more power.... even Dell - ie - Dell CG039 battery lists as 9cell @ 85Wh the "key" is what is used as a base voltage - 10.8 vs 11.1- which is interesting as most all rechargeables list as 1.2v 9 x 1.20v = 10.80v 9 x 1.24v = 11.07v 11.1v x 4800mah = 53Wh (NF343) 11.1v x 7600mah = 85Wh (CG039) Other battery vendors - 10.8v x 6600mah = 71Wh 10.8v x 7200mah = 77Wh It isn't 9 cells @ 1.2V. It is 3*3 at 3.6V, or in the other case 3.7V. The quoted nominal cell voltage of Li-Ion cells depends on who wants to impress whom as much as any clinical arguments. Using a charge termination voltage of 4v20 (the notation I prefer) and an end-of-discharge voltage of 3v0, the average is 3v6. Under constant current discharge the voltage curve is reasonably linear so using the average is a reasonable approach. However under constant power discharge the curve becomes steeper as the voltage drops, so 3v7 is more relevant in some arguments. huh - math is the same 9 x 1.2v = 10.8v 3 x 1.2v = 3.6v x 3 = 10.8v it is, only because 3.6 is exactly three times 1.2 the real question(able) issue, is using something other than 1.2v per cell. 3.6 or 3.7 Your choice really. |
#7
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Dell M1210 battery choices - 9 cell
"S.Lewis" wrote in message ... "ps56k" wrote in message ... Son just picked up a refurb Dell M1210 and likes it a lot compared to our Dell C610's.. It came with the Dell battery - NF343 - 11.1v 53Wh wondering where to go get the bigger brother, as backup, and the model number compared to the NF343 -- ---------------------------------- "If everything seems to be going well, you have obviously overlooked something." - Steven Wright Pacific battery doesn't stock it - yet. http://www.pacificbattery.com/dell_x...0_battery.html wonder if anyone has landed a decent M1210 new 9-cell battery from the variety of ebay sellers or other online stores ? |
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