Finding the Right Lipo for the Stryker

Here’s what I’ve found out about getting a lipo pack for my Stryker:

Compartment will easily fit a pack that measures 4.5″ x 1.34″ x 1.5″ (LxWxH). With some modifications, a longer pack could fit, however the 4.5″ appears to be long enough to fit just about any pack that falls within the other 2 dimensions. The recommended pack from Hobbyzone is a 2200mAh pack that weights 5.6 oz. or 159 grams. I don’t really want to buy the stock pack because it’s only rated for 27A continuous (12C) and it’s pretty pricey. I think there’s a lot of good 15C-20C packs available that are the same price or cheaper. Here’s what I’ve found so far from CheapBatteryPacks.com, Maxamps.com, TowerHobbies.com and Hobby-Lobby.com I mention only these suppliers simply because they are people who I have purchased from in the past and have been happy with the products they provide. I know eBay is full of cheap lipos, but I don’t even want to go there. I’m also only comparing 3S packs, as this is going into a bone-stock F-27C Stryker.

First from CheapBatteryPacks.com, everything that Mike carries sorted from lowest to highest price:

Vislero 3s 2100mah (cheapest pack I can find)
Dimensions: 100 x 34 x 21mm [3.94 x 1.34 x 0.83 in.]
Weight: 150 gms. [5.29 oz.]
Price $39.95 (no plug)
Factory C Rate 15C – (31 amps) Continuous
Burst C Rate 24C – (50 amps) under 10 seconds

PolyRC 2100mah 3S LP Series (decent pack, decent price)
Dimensions 113 x 34 x 25mm [4.45 x 1.34 x 0.98 in.]
Weight 154 gms. [5.43 oz.]
Price $59.88 (no plug)
Factory C Rate 18C – (37 amps) continuous
Burst C Rate 27C – (56 amps) under 10 seconds

Elite 3S 2100mah Cell (this is high-current pack)
Dimensions 96 x 34 x 26mm [3.78 x 1.34 x 1.02 in.]
Weight 160 gms. [5.65 oz.]
Price $59.99 (no plug)
Factory C Rate 25C – (52 amps) continuous
Burst C Rate 35C – (73 amps) under 10 seconds

PolyRC 2500mah 3S LP Series (the highest mAh pack that fits)
Dimensions 113 x 34 x 27mm [4.45 x 1.34 x 1.06 in.]
Weight 181 gms. [6.39 oz.]
Price $65
Factory C Rate 18C – (45 amps) continuous
Burst C Rate 27C – (67 amps) under 10 seconds

Thunder Power TP 2100mah 3s
Dimensions 100 x 34 x 20mm [3.94 x 1.34 x 0.79 in.]
Weight 142 gms. [5.01 oz.]
Price $69.95
Factory C Rate 15C – (31 amps) continuous
Burst C Rate 24C – (50 amps) under 10 seconds

Thunder Power TP Extreme 2200 3s
Dimensions 107 x 37 x 25mm [4.21 x 1.46 x 0.98 in.]
Weight 170 gms. [6.00 oz.]
Price $79.99
Factory C Rate 25C – (55 amps) continuous
Burst C Rate 50C – (110 amps) under 10 seconds

01-03-2008: This is pack I ended up getting. I actually bought it for my Brio 10 knowing it would drop right into my Stryker. I have yet to fly it, but it fits perfectly and should provide plenty of juice.

PolyRC 2000mah 3s 30C Lipo (the highest C-rated pack that fits)
Dimensions 106 x 35 x 25mm [4.17 x 1.38 x 0.98 in.]
Weight 184 gms. [6.49 oz.]
Price $86.34
Factory C Rate 30C – (60 amps) continuous
Burst C Rate 50C – (100 amps) under 10 seconds

Maxamps.com has this pack for $63.99:

Lipo 2100HV 3S 11.1V Pack
NEW COPPER TAB CELLS! (no plug)
2100mah Capacity
11.1 Volts
34mm X 98mm X 24mm
20C Constant(42 amps)
165 grams

Packs from Tower Hobbies:

FlightPower Evo Lite 2100 3S 11.1V
Size: 4.4 x 1.3 x 0.83″ (113 x 34 x 21mm)
Weight: 5.6oz (158g)
Capacity: 2100mAh
Continuous Discharge Current: 18C
Rated Voltage: 11.1V
Number of Cells in Series: 3
Price $62.99

FlightPower Evo 25 2170 3S 11.1V
Size: 4.3 x 1.3 x .94″ (110 x 34 x 24mm)
Weight: 6.1oz (174g)
Capacity: 2170mAh
Continuous Discharge Current: 25C
Rated Voltage: 11.1V
Number of Cells in Series: 3
Price $76.99

Great Planes ElectriFly Power Series Lithium Polymer 2100mAh
Capacity: 2100mAh
Continuous Discharge Current: 42A (20C)
Discharge Lead: 12AWG 3.1″ (80mm) long wire w/Deans Ultra Female Plug
Charge Lead: 24AWG 1.6″ (40mm) long wire w/Balance Connector
Pack Dimensions: 104x36x29mm (4.09×1.42×1.14″)
Weight: 6.14oz (174g)
Price $69.99

Hobby-Lobby.com has these packs (as well as several of the packs already mentioned above):

Thunder Power TP20703
3 Cell 2070 mAh “eXtreme”
11.1V LiPoly Battery Pack
Size: 4-3/8″ x 1-5/16″ x 1″
Weight: 5.8 oz.
Price: $79.99

PolyQuest 20
PQ21503 “Twenty” 3 Cell 11.1V
2150 mAh LiPo Pack
Price: $77.90
Size: 4 x 1-3/8 x 1-1/8″
Weight: 6.3 oz.

The average price is about $60-$80 with the Vislero pack coming in as the cheapest at only $40 and the PolyRC 30C pack being the most expensive due to its 100A discharge capability. Unless I were planning on upgrading several other components in my Stryker (the ESC is only rated to carry 25A) any one of these packs should be just fine. So I’ll probably just just go with the cheapest. However, I have a $10.00 off coupon from Tower Hobbies, so the FlightPower EVO 2100 looks tempting at only $52.99 after taking into account the coupon. Something tells me it might be a better pack than the Vislero one and it’s only $13 more. I haven’t really read bad things about either pack though, so it may come down to just a money thing. The EVO pack is approved for 2C charge rates and has a higher C rating although it is 8 grams heavier, it weighs exactly the same as the stock Hobbyzone pack so the CG should be spot on with this pack.

Anyway, that’s what I’ve found out so far with respect to a few lipos for the Stryker. I’ll be Sure and post a write-up on what I actually end up buying, until then, I’m still having fun with my 5-minute flight times and that old 8-cell battery pack. Also, I plan on updating this post as I find new/better packs.

Bought the TP eXtreme 2200

Update 01-16-2008: So I ended up buying the Thunder Power eXtreme 2200mAh V2 from Mike over at CheapBatteryPacks.com. I soldered a set of Ultra Deans and dropped it in my Stryker and it fits great, it’s super snug. I added a very small piece of styrofoam to the very front of the battery compartment to keep the battery as far back as possible. I needed to add 1/2 oz of weight (with some Play-Dough) in the back to get the CG right, and even then it’s still just slightly nose heavy. The Stryker doesn’t seem to care about the extra weight though, it absolutely screams and the run time is great. I’m not sure how long it lasts but it’s at least 10-15 minutes. And the battery comes down just barely warm. It’s a great battery for the Stryker and provides plenty of current without being taxed in the slightest. I’m debating moving up to a 6×5 prop to get a little extra speed. I know the battery can take it, it’s the motor and ESC that will need to be watched. As it is now, the motor is barely warm after a full run, so I think it can take more.

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