shirley_hkg wrote: Where did he learn that dangerous treat ?
ex-Gooserider wrote:NO!!!! Different battery chemistry, different voltages etc. so you would have MAJOR problems if you just tried to swap out the LiPo cells for LiFePO4 cells....
You would be much better off to pass those boosters to someone else, and build a proper LiFePO4 based add-on or just do a total conversion, with a PL8 charger and so on as described earlier in this thread...
ex-Gooserider
Burgerman wrote:You are confusing 3 different chemistries.
Lithium polymer, as you have now are good for really high currents so a small battery can start car or drive a chair, as both need up to 200A to do... Those are nominal 3.7V. They are USED from 3.6 to 4.2V and are damaged if higher or lower or can explode. These need 7 cells in series, not 6, so wont power your chair. 100 to 200 cycles. Or about 1 year in storage.
Lithium ion, as used in laptops, would be able to be charged in your car jump starters, but they still burn or explode. And while they have the same ish 3.6/3.7V nominal voltage they have a lower empty voltage so are used from 2.5V up to 4.2V and again you need 7S not 6. And they cant do high currents like your LiPo. So you would need about 70Ah to make any sense. 200 to 400 cycles, and about 2 years in storage.
Lithium ion phosphate, or LiFePO4 are safe, dont burn or explode, and also cant do big currents. So you really need about 90 to 200Ah ideally, or say 30Ah minimum to HELP your healthy quality lead batteries. And 8 in series. Not 6. They are 3.2 or 3.25 nominal volts. And are 3.600V charge. So your devices cant charge them. They also cant do big currents, and have 2000 cycles, and a 10 year calendar life.
Theres no cheap or easy safe way to do it.
12Ah returned to the lead Voltage on the 30Ah pack was down to 3.21V but 20Ah returned seems a little high?
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