Return to the Cloudy Nights Telescope Reviews home page


Telescope Specific Forums >> Celestron NexStar

Pages: 1 | 2 | (show all)
Ski-Patroller
member


Reged: 04/16/10

Re: Power tank died after 6 months new [Re: boandpokey]
      #6113259 - 10/02/13 02:21 PM

When I had a Nexstar 8 GPS I bought a 72AH Gel Battery from Batteries Plus. It was about $80 IIRC and had far more capacity than the power tank. It was also a deep cycle battery.

I use a small 7.2 AH battery to run my 5i, and it will run all night. It is a deep cycle also, one designed for a UPS system.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Geo.
Carpal Tunnel
*****

Reged: 10/01/08

Loc: Upstate NY
Re: Power tank died after 6 months new [Re: Ski-Patroller]
      #6119146 - 10/05/13 02:54 PM

I recently picked up a small charger for camp {i.e., in upstate NY, a small lake cottage}. One rainy day I read the instructions. Not much new information in there, but the description of the different types of lead acid batteries was interesting, to wit:

SLI These initials stand for Starting, Lighting and Ignition, which are the three basic functions which a battery has to perform on all normal vehicles. This battery type is usually used in cars, trucks and motorcycles. These batteries have vent caps and are often marked "Low Maintenance" or "Maintenance-free". This type of battery is designed to deliver quick bursts of energy (such as starting engines) and have a greater plate count. The plates will also be thinner and have somewhat different material composition. Most maintenance free batteries are SLI, otherwise known as Flooded, Regular or Standard Batteries. Regular batteries should not be used for deep cycle applications.

When antimony is known to be one of the materials used in the battery's construction, that battery is conventional/low maintenance type. Some low maintenance batteries have a relatively smooth top without any apparent battery filler caps. If, however, the battery manufacturer recommends periodic checking of the electrolyte level and provides access to the battery for water additions, the battery is probably a low maintenance type.

Deep-Cycle Deep-cycle batteries are usually marked as "Deep-Cycle" or "Marine". Deep-cycle batteries are usually larger than the other types. This type of battery has less instant energy but somewhat greater long-term energy delivery than regular batteries. Deep cycle batteries have thicker plates and can survive a number of discharge cycles.

AGM The Absorbed Glass Mat construction allows the electrolyte to be suspended in close proximity with the plate's active material. In theory, this enhances both the discharge and recharge efficiency. Actually, the AGM batteries are a variant of Sealed VRLA (valve regulated lead acid) batteries. Popular uses include high performance engine starting, power sports, deep cycle, solar and storage battery. AGM batteries are typically good deep cycle batteries, and they deliver best life performance - if recharged before the battery drops below a 50 percent charge. If these AGM batteries are completely discharged, the cycle life will be around 300 cycles. This is true of most AGM batteries rated as deep cycle batteries.

GEL The Gel Cell is similar to the AGM style because the electrolyte is suspended, but different because technically the AGM battery is still considered to be a wet cell. The electrolyte in a GEL cell has a silica additive that causes it to set up or stiffen. The recharge voltages on this type of cell are lower than the other styles of lead acid battery. This is probably the most sensitive cell in terms of adverse reactions to over-voltage charging. Gel Batteries are best used in VERY DEEP cycle application and may last a bit longer in hot weather applications. If the incorrect battery charger is used on a Gel Cell battery, poor performance and premature failure is certain.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1 | 2 | (show all)


Extra information
8 registered and 12 anonymous users are browsing this forum.

Moderator:  Brian Risley, panhard, mayidunk 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 1047

Jump to

CN Forums Home




Cloudy Nights Sponsor: Astronomics