Re: [EVDL] Lithium drop in replacements.

I have some headway cells in the original boxes, charge them every few months, if I wait too long some will be 2V and others 3.65, from being equal the time before. I have jigs to measure self discharge directly, a 4 wire very accurate charger with a current measurement, I calculate the self

Re: [EVDL] Lithium drop in replacements.

Hey thanks for your input. I’m sure a lot of people have varied experiences. I must’ve met there probably differences between manufacturers. However that was not my experience. I bought Bestgo sales hundred amp hour. I did extensive testing before installing them in a vehicle. I put 40 for 100

Re: [EVDL] Lithium drop in replacements.

>From: Cor van de Water via EV >I also did tests on LiFePO4 cells and while self-discharge was low, I was able >to prove from my measurements over many weeks, that there is was about a >factor 2 difference in self-discharge current between the best and worst cell. >Sample

Re: [EVDL] Lithium drop in replacements.

Another thing, I see the ebike chargers have 2 voltage pots, I think one is for the ballance charge, at reduced current. Have anyone seem this? On 12-May-18 6:47 AM, paul dove via EV wrote: Thanks that was interesting. It’s more likely that the Dakota BMS was causing the imbalance with

Re: [EVDL] Lithium drop in replacements.

I have used headway cells, headway specs them as 5% per month self discharge! so have close to zero, worse is 5 in practice. found it to be a big problem, if you charge every day it's ok, but the ebike i got them for may go a while without charging, also, If it is not left on charge long

Re: [EVDL] Lithium drop in replacements.

I also did tests on LiFePO4 cells and while self-discharge was low, I was able to prove from my measurements over many weeks, that there is was about a factor 2 difference in self-discharge current between the best and worst cell. Sample size was over 40 cells. This is exactly what the author

Re: [EVDL] Lithium drop in replacements.

Actually I do have evidence. I did extensive testing with LiFePO4 cells. I found no evidence of self discharge or of balance issues with cells connected in series. Sent from my iPhone > On May 11, 2018, at 4:43 PM, Bill Dube via EV wrote: > > Paul, > > Do you have any

Re: [EVDL] Lithium drop in replacements.

Paul, Do you have any evidence of this or is it speculation? (Sorry, I just couldn't help myself.) Bill D On 5/11/2018 12:47 PM, paul dove via EV wrote: Thanks that was interesting. It’s more likely that the Dakota BMS was causing the imbalance with parasitic unbalanced loads, however.

Re: [EVDL] Lithium drop in replacements.

Thanks that was interesting. It’s more likely that the Dakota BMS was causing the imbalance with parasitic unbalanced loads, however. Sent from my iPhone > On May 11, 2018, at 11:56 AM, EVDL Administrator via EV > wrote: > >> On 10 May 2018 at 6:35, paul dove via EV wrote:

Re: [EVDL] Lithium drop in replacements.

On 10 May 2018 at 6:35, paul dove via EV wrote: > Do you have any evidence of these batteries failing because of out of balance > conditions or is that speculation The battery I mentioned ("Dakota" brand) was advertised as having a true balancing BMS. Discussion of PCBs vs BMSes here:

Re: [EVDL] Lithium drop in replacements.

Do you have any evidence of these batteries failing because of out of balance conditions or is that speculation Sent from my iPhone > On May 9, 2018, at 9:22 PM, EVDL Administrator via EV > wrote: > >> On 9 May 2018 at 21:21, Lawrence Rhodes via EV wrote: >> >> wait a

Re: [EVDL] Lithium drop in replacements.

On 9 May 2018 at 21:21, Lawrence Rhodes via EV wrote: > wait a couple weeks as totally protected drop in replacements changing > a 35 ah form factor into a 50 ah battery with many more cycles made > from lithium was coming. I've seen a lot of these around already. I almost bought a small one

[EVDL] Lithium drop in replacements.

This carbon lead issue is dead for me.  I asked Jim at American Battery in Hayward about carbon/lead batteries and he said wait a couple weeks as totally protected drop in replacements changing a 35 ah form factor into a 50 ah battery with many more cycles made from lithium was coming.  These