Battery Pack Again

[mygrumpy001]

Hi All 4 25c 2700mah 3SIP 11.1 tested with Multimeter 38.5v on bike 25.32 something wrong any idea photo to follow Thanks For Any Help

 

[Alan Quay]

At he risk of repeating myself, that's correct for the 2S2P arrangement that you have created. This will give you a nominal 21.6v pack (which will measure around 25.2V fully charged)

 

[mygrumpy001]

At he risk of repeating myself, that's correct for the 2S2P arrangement that you have created. This will give you a nominal 21.6v pack (which will measure around 25.2V fully charged)

Hi Alan So why does it read 38.5v on Muiltmeter so what needs to be done mygrumpy001

 

[Alan Quay]

I don't understand what ' tested with Multimeter 38.5v on bike 25.32' means. Please elaborate.

 

[Nealh]

When connected on the bike you have 2s2p as Alan states so 2 in series then paralleled or vica versa to get 25.32v which is more then 4.2v per cell. I guess the 38.5 reading was before you connected them up on the bike but sounds like you have connected only 3 in series to get that reading or if you wired them all up have connected them wrong to get that reading. So I assume you are running a 24v set up so your 2s2p lipo is not really much good as 24v is usually 7s @ 29.4v.
You need to be careful with charging and connecting lipo other wise you will have a fire after the bang. I only charge to 41.5 per cell and even then there is little use to be had at that reading on a bike and very quickly on the bike voltage drops quickly to under 41v. The last 1v of charge upto 42v contains as little as 3 or 4% of total capacity.

 

[Alan Quay]

When connected on the bike you have 2s2p as Alan states so 2 in series then paralleled or vica versa to get 25.32v which is more then 4.2v per cell. I guess the 38.5 reading was before you connected them up on the bike but sounds like you have connected only 3 in series to get that reading or if you wired them all up have connected them wrong to get that reading. So I assume you are running a 24v set up so your 2s2p lipo is not really much good as 24v is usually 7s @ 29.4v.
You need to be careful with charging and connecting lipo other wise you will have a fire after the bang. I only charge to 41.5 per cell and even then there is little use to be had at that reading on a bike and very quickly on the bike voltage drops quickly to under 41v. The last 1v of charge upto 42v contains as little as 3 or 4% of total capacity.

I have assumed his packs are 3s1p, (10.8v nominal, 12.6v charged) then he has arranged those packs as 2s2p, giving a total of 6s2p.

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[mygrumpy001]

At he risk of repeating myself, that's correct for the 2S2P arrangement that you have created. This will give you a nominal 21.6v pack (which will measure around 25.2V fully charged)

Hi Alan This is getting a pain for you and me on Scriptasylum.com it has a bar in the middle is that wright John

 

[Alan Quay]

Hi Alan This is getting a pain for you and me on Scriptasylum.com it has a bar in the middle is that wright John

I give up.

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