Ypedal wrote:6 packs in paralell..
If i'm counting that right.. each " fat pack" is 5S2P so 36v3ah.. each. x 6 = 18ah
This should be good for 180 amps + !
John in CR wrote:10s2p, but yep at least 180A, though I think the VT version may sacrifice some capacity for even higher power.
HornetB wrote:I think I read somewhere that these cells in the bosch packs were actually only 1.1Ah, so that makes the packs actually 36v 2.2Ah. I came across some information that suggested packs produced a while ago were 2.4Ah, making each cell 1.2Ah. But the current ones are 1.1Ah Konions.
I think I'll be buying a few bosch packs for myself anyway. Cheap way in.
Tom wrote:build a 48v solution, but not sure about charging logistics.
Tom wrote:Thanks John, one question I have looking at the pics is how the 10 batteries in each pack are connected 5s2p? I only see 4, 4, and 2 connected. Also, how are you charging the packs? Can you do it in parallel with one Bosch charger? Can the Bosch charger charge other configurations? I'm hoping to pull my packs apart and build a 48v solution, but not sure about charging logistics.
Tom wrote:Ah, got it. Yes, ideally keep the structure of the 5s2p cells intact and do some simple re-wiring to achieve 54v.
What kind of gauge wire is connecting each 5s2p group of cells? Wondering if that might be a limiting factor.
John in CR wrote:it took right at 1 hour to charge from the 40.5v (full charge cutoff of the Bosch charger) to the full charge of 42v with a current of 1.6A
John in CR wrote:It's not wire, just the same tab material that connects all the cells
Tom wrote:John in CR wrote:It's not wire, just the same tab material that connects all the cells
What I meant was the wiring you appear to be using to connect the batteries in parallel. Is that your wiring or the Bosch wiring? I've peeked inside the Bosch drills at the battery connectors and the wire they were using was pretty thin. The wiring in your pics looks beefier.
pwbset wrote:The 18650VT is stated in the RCGroups forum as having a specific charge to 4.1v/cell and not 4.2v like the 18650V. This may explain the 40.5v max Bosch charge. To be taken with a grain of salt of course... I think the person may have been thinking of the 26650VT instead, which does indeed list 4.1v max charge per Sony's press release.
Regardless with the 25% Live.com/Ebay stuff and the way you're putting these packs together duct-tape-style it's incredibly tempting to invest a few hundred bucks into these fatpacks. Don't even need to worry about welding/soldering etc. etc. Nice. Already have a 37v Lipo charger that would work perfectly. How much does your 6-pack weigh?
Ugh... keep food on the table and the heat turned on or buy new batteries... decisions, decisions.
Ypedal wrote:This is what i ended up with... ( 72v 20ah LiMn)
Into the 1000$ range, DH / Freeride bikes.. stuff is incredibly tough..
John in CR wrote: It really reinforces my desire to build a heavy duty 2 wheel EV with pedals that is closer related to a bike than a motorcycle, but has the comfort and stability of a motorcycle... a beefed up downhill-like rig at a fraction of the cost by accepting the weight penalty of using some motorcycle parts.
dimitrib90 wrote:If I bought these packs and didnt open them, could I series and parallel them together and get a very high voltage and ah? Also if I wanted to discharge 5C, could I do that with these packs since there is no BMS to limit it?