KPJ wrote: > I have a Tri-M HE-104 PC/104 power supply with a BC104 battery > charge option. I would like to be able to use the HE-104 to > charge Sony NP-F960 batteries Unless you know exactly what you are doing (in which case you would not be asking these questions), please don't try chargining lithium-ion batteries using anything but the chargers that are made for them. Inside the NP-960 is a little computer that monitors the battery and talks to the charger, indicating when it is SAFE to charge and when to STOP charging. Bypassing this circuitry is very dangerous. If you can get the protocol info and talk to the internal battery monitor in the same way that the traditional chargers do, that's a different story, but I have never heard of anyone who has done that. > 0. Is this possible? Possible? Yes. Safe? No. > which really boils down to > 0.1. Does the battery have special requirements (like charging > voltage curve form, etc.)? Lithium Ion is volatile and can explode if over-charged. This is why you CAN'T buy l;ithium-ion cells as a consumer, you can only buy battery packs wih the monitoring/charging circuitry integrated into the packs (which talk to the charger). You CAN get the necessary components from maxim and other suppliers, but you need to know exactly what you are doing. > Does the Sony NP-F960 batteries require the Sony BC-V615 ? Not sure but I assume the answer is yes. > 0.2. What happens if the battery is charged when already 100 % charged? > = Does it handle it gracefully (or does it become damaged)? Worse, it is very volatile and could explode! I suggest that you leave li-ion charging to the experts. If you want to use the battery charging facilities of HE104/BC104 I suggest that you stick with nickel cadmium or nickel metal-hydride batteries, which are not volatile and are therefore much safer than li-ion. BTW one other postential (although futuristic) alternative is lithium-ion polymer, which has better energy density than the li-ion (circular) and is much less volatile. Here is an example of lithium polymer cells that have an energy density of 130 Wh/kg! http://www.ultralifebatteries.com/polymer.html When compared with the energy density of other batteries: Lead Acid 30 Wh/kg Ni-Cad 40-60 Wh/kg NiMH 60-80 Wh/kg Li-Ion 90-100 Wh/kg Li-Poly 130-150 Wh/kg The other interesting things about li-poly batteries is that they can be shaped. Traditional Li-ion batteries use electrolyte solution that must be contained in a solid circular reservoir. Lithium Polymer uses a plastic electrolyte (hence the polymer name) that can be made into any shape. This means the case for a device (say handheld or cell phone) could actually be the batteries! Too bad it's not as simple as opening a can of silly putty ;-) Your goal of charging with the BC104 is admirable but it's really not safe with Li-ion cells. You might want to consider using the new Sanyo 4500mah 1.2 volt NiMH cells instead. Energy density is not as good as Li-ion, but it's not too bad. -- Doug ------------------------------------------------------------ Grow your own Wearables: http://wearables.los-gatos.net What I'd like is to have you call me and my jacket answers ------------------------------------------------------------ -- Subscription/unsubscription/info requests: send e-mail with subject of "subscribe", "unsubscribe", or "info" toWear-Hard Mailing List Archive (searchable): http://wearables.blu.org please, Please, *PLEASE* don't subscribe through a forward/false domain
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