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You're not so much looking for a battery charger as you are a "battery manager". … Off-the-shelf LiFePO4 chargers accomplish the charging in 3 stages: Supply constant current (correct amount is specific to battery model) until the cell voltage hits its maximum Supply constant voltage …

For our batteries, we spot-welded nickel plates to the tops and bottoms of Li-ion 18650 cells to make battery packs, and then added crimp terminals to the connections between packs. …

Then you can look at constructing a battery management system that can safely deal with the cells you have. …

At one of my previous jobs, we had a homemade 1.5kW battery that was made of 648 (yes, six hundred and forty eight) LiPoly 18650 cells: 24 supercells in series, each cell being 27 batteries in parallel … Here's an example of what the supercell charges looked like when we serviced the battery and each supercell was equally charged (ours were 3.7V min, 4.2V max): As you can see, they mostly discharge and …

LiPo batteries have a distinct "knee" in their performance, generally around 3.4V-3.6V: It will be slightly different depending on the exact battery, and how you've arranged them in your battery packs … (you need to account for the current load when measuring the voltage) -- so it makes sense to characterize your own battery first. …

current Longevity: some batteries will degrade if charged beyond what the chemistry can handle A power supply capable of running the motor would be damaging (if not dangerous) to connect directly to the battery …

The desired behavior is exactly like a laptop battery system: When mains voltage is connected, charge the battery and power the system from mains When mains voltage is disconnected, power the system … from the battery Prevent the battery system from supplying current when the batteries are discharged below a certain voltage (to prevent damage). …

To quote from this example: PMICs seamlessly manage power flow from various power sources (wall adapters, USB and batteries) to power loads (device systems and the charging battery), while maintaining … To this end, PMICs typically feature built-in PowerPath control, DC/DC conversion and battery charging functions. …

If the motor itself is rated for 16.8 VDC (or more) then there is no problem connecting it directly to the battery. …

This question may be more suited to an electrical engineering site, but one thing to consider is that your batteries will have a maximum allowable charge current. What this means is that if the whe …

If you're already considering discarding this battery, you might as well test its electrical properties (and physical properties) against an intact replacement. … battery. …

It sounds like you're asking 2 questions: Is an imbalance in motor performance indicative of a failing battery? How would you test for a failing battery? … So in that sense, the imbalance in motor performance was related to the battery but not necessarily a battery failure. …

If you're considering putting a battery on each arm (close to each motor), be aware that it does not provide an advantage. … Electrically, your best bet would be to connect all 4 batteries in parallel -- essentially making your own multicell battery, no different than others you could buy off the shelf. …

deteriorate much faster than the other -- it will last for fewer recharge cycles You should re-charge them separately, not in series However, if you're looking for an off-the-shelf 10V lithium-ion battery …

For example, Autosub 6000's battery packs -- depth-rated to 6000 meters, without the aid of a cylindrical or spherical pressure housing: (http://www.thesearethevoyages.net/jc44/autosub6000_page1.html) … For other battery technologies, you'll have to decide how to pack them into your pressure housing, which may be a bit more complicated. …