SHARKBITEATTACK
10 W
Home Depot has a sale today. 2 of there 18v 4ah Lithium+ batteries for $100. Anyone have experience with these?
Ryobi Lithium batteries Good for ebike?
- Thread starter SHARKBITEATTACK
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wheelbender6
100 W
If my calculations are correct, and they rarely are, you would need four of those batteries for 36v 8ah. Individual batteries would be wired in series to form pairs to double the voltage. The pairs would be wired in parallel to double the amp hours?
SHARKBITEATTACK
10 W
wheelbender6 said:
Yes you are correct.
SHARKBITEATTACK
10 W
Anyone know what kind of cells might be in these? I stocked up on them
dogman dan
1 PW
No experience with Ryobi's lithium drill batteries, but plenty with their nicads.
The nicads were middle of the road in quality, longevity. I'd get a year or two of daily use from them. I would expect the lithium to be about the same. Cheaper up front, but not quite up to the level of Makita stuff that cost more.
36v 4 ah for 100 is not a horrible price, but not a go buy 10 of em price either. I would have liked to get that price for some to use on the tools for sure. $50 each is not too bad. Not sure what the c rate of the cells inside would be.
For a very small lightweight bike, 8 ah worth could be a good way to go, but I wouldn't call it the best way to go. You'd need lots of the chargers, or have to rotate 4 packs through one charger tediously.
The nicads were middle of the road in quality, longevity. I'd get a year or two of daily use from them. I would expect the lithium to be about the same. Cheaper up front, but not quite up to the level of Makita stuff that cost more.
36v 4 ah for 100 is not a horrible price, but not a go buy 10 of em price either. I would have liked to get that price for some to use on the tools for sure. $50 each is not too bad. Not sure what the c rate of the cells inside would be.
For a very small lightweight bike, 8 ah worth could be a good way to go, but I wouldn't call it the best way to go. You'd need lots of the chargers, or have to rotate 4 packs through one charger tediously.
dannyboyohyeah
100 W
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When you buy cordless tools, it seems they throw in the chargers for free or something. But buying chargers seperately gets ridiculously expensive. I'd need twelve of these babies and at least six chargers to fulfill a reasonable duty. And then, there's the bulkiness of all those charging stems. Seems only a reasonable way to go, for someone occasionally going out for groceries and not too far away.
Once we got the motor and controllers and all the other goodies set up, we can nearly forget about them for a good while (most of us)....but no one ever stops thinking about their batteries I don't think. It's definately an investment. Ryobi is famous amoung carpenters as nearly the cheapest tool to buy, and as Dogman says, their batteries sort've follow this level of quality as well. I'd rethink my investment strategy, mostly because of those darned chargers (even though it's a real plug 'n play arrangement.) I've consisently had to buy two Ryobi batts for every Makita batt through the years.
Once we got the motor and controllers and all the other goodies set up, we can nearly forget about them for a good while (most of us)....but no one ever stops thinking about their batteries I don't think. It's definately an investment. Ryobi is famous amoung carpenters as nearly the cheapest tool to buy, and as Dogman says, their batteries sort've follow this level of quality as well. I'd rethink my investment strategy, mostly because of those darned chargers (even though it's a real plug 'n play arrangement.) I've consisently had to buy two Ryobi batts for every Makita batt through the years.
no experience with ryobi but i agree with what dogman said-
these cells are expensive- the quality isnt that great- sometimes they have limiting circuits in them so you cant use it with anything but ryobi products- and charging is a pain. you can get by cheaper by getting a stick of lipo or two from hk- but if you can get the ryobi for dirt cheap, and it's the only thing you have available, i would say yes- it will get you by, but dont expect performance.- you could buy 2 and test them for us,
based on the msds it looks like it is using 18650 cells LG18650HB2 Lithium Ion Rechargeable Battery
chemistry: Cobalt lithium manganese nickel oxide
looks like thet at 1c to 1.6c discharge max but rated at 20c, strange
even 1.6c would be 13amps which is enough
1.1 Capacity Nominal Capacity1500mah(1.2A Discharge) Minimum Capacity 1450mAh(0.48ADischarge)
1.2 Nominal Voltage 3.7V
1.3 Internal Impedance ≤ 70m
1.4 Discharge Cut-off Voltage 3.0V
1.5 Max Charge Voltage 4.20±0.05V
1.6 Standard Charge Current 1.2A
1.7 Max Charge Current 2.2A
1.8 Standard Discharge Current 1.2A
1.9 Max Continue Discharge Current 2.4A
1.10 Max Pulse Discharge Current 4.8A
these cells are expensive- the quality isnt that great- sometimes they have limiting circuits in them so you cant use it with anything but ryobi products- and charging is a pain. you can get by cheaper by getting a stick of lipo or two from hk- but if you can get the ryobi for dirt cheap, and it's the only thing you have available, i would say yes- it will get you by, but dont expect performance.- you could buy 2 and test them for us,
based on the msds it looks like it is using 18650 cells LG18650HB2 Lithium Ion Rechargeable Battery
chemistry: Cobalt lithium manganese nickel oxide
looks like thet at 1c to 1.6c discharge max but rated at 20c, strange
even 1.6c would be 13amps which is enough
1.1 Capacity Nominal Capacity1500mah(1.2A Discharge) Minimum Capacity 1450mAh(0.48ADischarge)
1.2 Nominal Voltage 3.7V
1.3 Internal Impedance ≤ 70m
1.4 Discharge Cut-off Voltage 3.0V
1.5 Max Charge Voltage 4.20±0.05V
1.6 Standard Charge Current 1.2A
1.7 Max Charge Current 2.2A
1.8 Standard Discharge Current 1.2A
1.9 Max Continue Discharge Current 2.4A
1.10 Max Pulse Discharge Current 4.8A
FeralDog
100 W
I have several of those Ryobi packs (or similar). In use for about 2 years now on the Ryobi tool sets.
No experience with them on an e-vehicle, or e-bike, BUT I have abused the hell out them on many job sites.
Hot ... cold... dropped them from a roof ... and they work like champs.
I initially had one bad pack from the "combo tool set" you typically get those batteries in. That leads me to the virtue I can see in them for low Ah uses.
They have a good WARRANTY if you don't take them apart!
I took the dud pack, and any similar (battery) receipt to Home Despot and the guy at the counter simply gave me a new one. No questions ask. That can be a good thing if you are using them in experiments?
No experience with them on an e-vehicle, or e-bike, BUT I have abused the hell out them on many job sites.
Hot ... cold... dropped them from a roof ... and they work like champs.
I initially had one bad pack from the "combo tool set" you typically get those batteries in. That leads me to the virtue I can see in them for low Ah uses.
They have a good WARRANTY if you don't take them apart!
I took the dud pack, and any similar (battery) receipt to Home Despot and the guy at the counter simply gave me a new one. No questions ask. That can be a good thing if you are using them in experiments?
spinningmagnets
100 TW
If you decide to use cordless tool batteries in their original housing (to preserve the warranty, and/or make stock charging easy), the built-in BMS will limit the amps that can be pulled. All I'm saying is that...if you build a pack of four to get 36V/8-Ah...if it runs fine, then no sweat, but...if it cuts out under heavy use, you will need to add more 36V pack pairs until it no longer cuts out due to maxing the amps.
SHARKBITEATTACK
10 W
ok thanks for all the input guys. It seems like they could work but it would be alot of work to make a good system. I know many people have used bosch fatpacks and other tool batteries so this made me wonder whan I saw lithiums on sale. I wound up buying 8 of these but it looks like Im just gonna resell them all then put the money toward an A123 or headway pack sometime in the future when I decide to upgrade my NiMH. The 2 packs are going for $135 -$150 one ebay and I only paid $100 for them 
Hillhater
100 TW
davec said:
Davec,.. are you sure that is the cell in those packs ?
I dont see how they could make those into a "4Ahr" pack ( 5s,2p = 3Ahr) and not enough room for 3p.
...and i doubt Ryobi would risk false advertising claims.
More likely they would use a 2 Ahr cell of some sort.
i am sure it's LG18650HB2 Lithium Ion based on the msds
if you google that, china is selling LG18650HB2 on alibaba,
the LG18650HB2 ryobi uses could be different cells from a different source..so the specs i posted could be wrong..but that's all i was able to find- only way to know though is have someone review one of these packs and tear it apart.
if you google that, china is selling LG18650HB2 on alibaba,
the LG18650HB2 ryobi uses could be different cells from a different source..so the specs i posted could be wrong..but that's all i was able to find- only way to know though is have someone review one of these packs and tear it apart.
Hillhater
100 TW
dannyboyohyeah said:
Well, charging may not be such a problem.
They do have a 6 port charger for <$75 on Amazon.
nechaus
100 kW
the big charger is not worth getting
its just a single charger, Once one pack is done, it will charge the next, so it does not charge all packs at the same time.
These batteries are not worth getting imo unless they are less than $30 per item, its much cheaper to get a small lipo pack
its just a single charger, Once one pack is done, it will charge the next, so it does not charge all packs at the same time.
These batteries are not worth getting imo unless they are less than $30 per item, its much cheaper to get a small lipo pack
SHARKBITEATTACK
10 W
nechaus said:
For the initial investment isn't it always cheaper to get a lipo pack?
Ch00paKabrA
10 kW
I just saw these in Home depot too. My objection would be that you need to run in both series and parallel. Why bother when you can just get a greenworks 36v 4ah battery for the same price? The "series is already taken care of for you. and just run 2 parallel.
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