Recent content by Jack.Straw

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  1. J

    Do Li-ion protected cells need BMS?

    Hi guys. I'm trying to come up with a battery & charging plan for a little amplifier that i'm making. I'm looking at a 12(ish) volt system, so i'm thinking i'll probably start with 3 of the Panosonic NCR18650B in series to start, but may add another 3 series pack in parallel if the battery...
  2. J

    Need Li-Ion battery/charger suggestions

    Hello. I like to build portable amplifiers for media players/phones. Up until now i've been using NiMH batteries in low power 9v amp chips. The battery life is incredible, but the sound is just ok. I'm looking to move up to a 12v class-D amp board and a 12v Li-Ion pack. I've been doing lots...
  3. J

    Looking for an internal battery charger

    I've been trying to get a handle on all this and my head is starting to spin. More questions: 1) If a li-ion battery is listed as "protected", does that mean it has built in over-charge and over-discharge protection? In other words, if i buy protected batteries, does that mean i do not need a...
  4. J

    Looking for an internal battery charger

    Gotcha, thanks for the info!
  5. J

    Looking for an internal battery charger

    CuriousOne, i have some questions if you wouldn't mind helping me understand some things. I'm looking into going your route. I already have a PAM8610 amp laying around, so i can use that for my test. I've always put my batteries in series to obtain the required voltage of the amp. I...
  6. J

    Looking for an internal battery charger

    Awesome, thanks CO! I'm going to try out your route and see what kind of results i get. Thank you so much for taking the time to share the info!
  7. J

    Looking for an internal battery charger

    CuriousOne, thanks for the response! I'd be interested in knowing more about the Li-Ion cell and the amp you use. Is it a 12v amp? What kind of battery life are you seeing? I'm not married to the NiMH, it's just what a chose about 5 years ago after doing a little web research. They work...
  8. J

    Looking for an internal battery charger

    Hello. Over the years i've been building little amplifiers for friends. I generally use 8x AA NiMH batteries to power them. It's important to me that the user not have to remove the batteries in order to charge them. It's also important to me that they be able to use the amp while the...
  9. J

    Car camping battery solution?

    That's perfect. I looked up the dual battery setup as suggested above, for using the alternator to charge a 2nd battery and that looks more complex than i'd like. Using the cigarette lighter to provide a slow charge while driving sounds more up my alley. I have built hobby battery chargers in...
  10. J

    Car camping battery solution?

    That's really cool! Probably a little more than i need though
  11. J

    Car camping battery solution?

    The battery says 500 CCA, 85 RC Unfortunately the fan doesn't have any information on the packaging or the unit itself concerning current draw.
  12. J

    Car camping battery solution?

    So i'm converting my Honda Element into a micro-camper. I would like to be able to run a 12v fan at night, recharge our cell phones, and turn on the light occasionally. The light usage would be minimal, just for a few minutes while getting ready for bed. The small fan could run for 6-10 hours...
  13. J

    UB1250 enclosed charging?

    Hi. I purchased a UB1250 12v, 5Ah, SLA deep cycle battery. I intended to use it inside of a 5 liter mini-keg to power an 12v amplifier, as well as some 5v accessories (Bluetooth audio receiver & occasional phone charging). I just noticed that it says on the battery "do not charge in a sealed...
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