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Batteries and Battery Chargers

Battery Packs and Cells

Lithium Iron Phosphate (LiFePO4) is a fairly new battery technology, offering distinct advantages over other batteries including being lighter weight than NiMH, having a flat discharge rate, and being significantly safer than Lithium Ion. The lithium iron phosphate batteries do not burst into flame if you look at them funny or nudge them a bit. The thermal runaway in these batteries does not start until over 500 degrees C — if the battery gets that hot in the RC boats, you have far more serious problems on your hands!

Comparison of cell sizes. The smallest battery on the left is AA sized. The battery farthest to the right is D sized.

The cells are sold as individual cells or as battery packs, and can be sold with tabs upon request. All cells are 3.2 volts. They are sold in the AA (14500 size) and D (32600) size form factors, and in a large flat stainless steel-encased cell. Cells in the AA and D sizes fit standard battery holders, but should not be mixed with regular household batteries as these cells are 3.2 volts instead of 1.2-1.5 volts. The flat stainless steel-encased cell is 18 mm thick, 82 mm wide, and 130 mm tall. It has two M6 threaded studs for connecting to your circuit, and is a high discharge rated to 20 C (200 amps).

The battery packs are currently shipped without a battery protection circuit PCB (the PCB and smart charger are interfering with each other), and a smart charger needs to be used to protect against overcharging. Without the PCB, you do need to be careful to not over-discharge the cells and shorten their life. The cells quickly drop off in voltage at about 85% to 95% of discharge, and should be recharged when they drop below about 2.7 volts.

Your boats and other RC projects can benefit by using these batteries and their safety and weight advantages. A 5Ah pack at 6.4 volts is just under one pound. The flat armored cell is 10 Ah at 3.2 volts and also just under a pound. A four-pack of AA cells provides 12.8 volts and is good for driving solenoid valves. The regular discharge batteries should typically be kept under a 3 C discharge rate (i.e. a 3.5 amp hour battery discharging at 10.5 amps is a 3 C rate and will discharge the battery in a little less than 20 minutes). High discharge batteries are good for 10C or more.

We have battery packs made from many sizes of cylindrical battery cells. The nomenclature for cell naming is for the first two digits to represent the diameter of the cell, while the two digits after that are the length. A 14500 cell is 14 mm in diameter and 50 mm long. We are typically building the packs with two cells side by side, but can make them end-to-end on request.

To buy, please email sales@strikemodels.com. Shipping at the moment is too complicated for the online system.

Individual Cells

SizeAmp HourHigh Discharge?WeightCost
AA (14500)0.5 AhNo0.7 oz$2.50
D (32600)3.0 AhYes4.1 oz$17.00
D (32600)3.5 AhNo4.4 oz$17.00
Flat
18mm x 82mm x 130mm
10 AhYes15.3 oz$45.00

The 32900, 26650, and 22650 battery packs.

Battery Packs (two cells, side by side)

SizeAmp HourHigh Discharge?WeightCost
186501.5 AhNo3.5 oz$11.00
226501.7 AhYes5.0 oz$20.00
266502.3 AhYes6.7 oz$30.00
329005 AhNo15.5 oz$55.00

Battery Charger     $65


The EV-650A battery charger will charge NiCd (NiCad), NiMH (nickel metal hydride), Li-Ion (lithium ion), LiPo (lithium polymer), LiFe (Lithium Iron Phosphate / LiFePO4), and Pb (lead acid or gel cell) batteries. Several battery adapters, including Deans and Tamiya, are included with this charger. This charger does not come with a power source, and either needs a large 12 volt battery or an AC power supply (input 10.5 – 18.0V, preferably at 5 amps or more).

Features:

  • Microprocessor controlled smart charger
  • Delta-peak sensitivity
  • Individual cell balancing
  • Programmable charge current
  • Time limit / time-out function
  • Input voltage monitoring
  • Data storage (store up to five packs in memory)
  • Battery break in and cycling
  • LCD screen
  • DC input port
  • USB Port
  • Temperature sensor port
  • Balance port
  • Output port

Specifications:

  • Input voltage range : DC 10.5 – 18.0V
  • Charge current range: 0.1 – 5.0A
  • Discharge current range : 0.1 – 1.0A
  • Charge power : maximum 50W
  • Discharge power: maximum 5W
  • Discharge current range : 0.1 – 1.0A
  • Balance current: maximum 250mA
  • Data store : max. 5 data of batteries
  • NiCd/NiMH battery cell count: 1 – 15cells
  • LoPo/LiLo/LiFe battery cell count: 1 – 6cells
  • Pb battery voltage : 2V – 20V
  • Weight: 260g
  • Dimensions: 130x85x26mm

Price: $65

 

Smart Battery Charger