Bosch GBH 24 VFR Batteries
- Thread starter JAA
- Start date
tim.rose2
Active member
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woollydigger
Member
A good idea make your own battery pack would cost about the same plus you could up the AH
The one i'm in the process of making will give 90 ah instead of 3.4ah
The one i'm in the process of making will give 90 ah instead of 3.4ah
JAA
Well-known member
A bit beyond my limited electrickery know how sadly!
JohnMCooper
Active member
Be interested to know how heavy a 90 ah battery is
Maisie Syntax
Active member
Go on then - I'll bight: how do yo plan creating said monster?
woollydigger
Member
I am aiming to fit 2 12v 90ah e bike battery's into 24v and put in a 250mm x170mmx 170mm ammo tin sealed with a 2m cord
Maisie Syntax
Active member
That certainly sounds like a brave plan. Boring possibly, but I think I'll stick with my two original Bosch units which have currently coped with anything I needed them for in a typical day of concerted heavy usage. Good luck all the same. Incidentally, what on earth are you doing that requires so much 'heft'?
woollydigger
Member
the main dig site is 6hrs into the cave as I am mainly a solo digger i need as much drilling time as i can get per trip
Both ebikes and drill batteries are usually based on 18650s. Assuming you're using a good quality drill battery, the energy density of both solutions will be approximately the same (apart from the fact that you'd have more packaging with multiple drill batteries) - I would have thought the benefit of using a bodged ebike battery would be minimal. It is possible to make some gains by using the best quality 18650 cells with maximum capacity and building it from scratch, but given you must use high drain cells (or risk a fire), the added benifit is minimal (they are mostly around the 2.8 to 3 Ah range) and the cost is probably equivalent or higher. I personally would stay away from Li Polymer, they're too unstable.
I nearly set my house on fire with a home made drill battery (whcih was Li Polymer) - in my opinion it's best to stick with batteries made by the drill manufacturer.
I nearly set my house on fire with a home made drill battery (whcih was Li Polymer) - in my opinion it's best to stick with batteries made by the drill manufacturer.
Chocolate fireguard
Active member
Can't comment on the mass and cost. But 180?
Tritim230
Well-known member
Hmm. As a fire engineer I would be extremely concerned about messing around with Li-ion batteries. The principal risks are damage, water ingress and overloading. All of which can cause degassing and thermal runaway. Degassing is a particular hazard as the fumes are both toxic and quickly reach the explosive limit in a confined space such as a cave. I suppose it is one way to bring rocks down but the digger will almost certainly be history. Please don't do it as knowing the cave in question and the rescue difficulties involved it won't end happily.
Chocolate fireguard
Active member
Ah yes. I looked up the wrong battery (actually a pair of 18650s!) and so got the wrong voltage. Sorry.
It could also be 90Wh, which at 12v would pretty much have the same effect as adding a decimal point!
woollydigger
Member
yes water doesn't like Li-ion batteries and makes them go bang!. caves are damp and wet so what ever battery you use must be 100% sealed and waterproof and don't need to be vented
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This photo is of a band new Ni-cd vented drill battery after one trip in normal cave conditions this is why i
am making a waterproof sealed battery pack so I'm safe as possibly be.
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am making a waterproof sealed battery pack so I'm safe as possibly be.
